A Manual for Commercial Production of the |
Financial support for this project was provided by the Center for Tropical and Subtropical Aquaculture through grants from the U.S. Department of Agriculture Cooperative State Research, Education and Extension Service (USDA grant numbers 93-38500-8583 and 94-38500-0065).
Production of the manual was also funded in part by a grant from the National Oceanic and Atmospheric Administration, project #A/AS-1, which is sponsored by the University of Hawaii Sea Grant College Program, School of Ocean Earth Science and Technology (SOEST), under Institutional Grant No. NA36RGO507 from NOAA Office of Sea Grant, Department of Commerce, UNIHI-SEAGRANT-TR-96-01.
Support for the production of the manual was also provided by the Hawaii State Aquaculture Development Program, Department of Land and Natural Resources, State of Hawaii, as part of its Aquaculture Extension Project with University of Hawaii Sea Grant Extension, Service Contract Nos. 9325 and 9638.
The views expressed herein are those of the authors and do not necessarily reflect the views of the Center for Tropical and Subtropical Aquaculture, USDA or any of its sub-agencies.
Special thanks are extended to Christine Carlstrom-Trick for her editorial comments.
Patti Killelea-Almonte wrote the HTML code to prepare this document for the Worldwide Web.
The information presented here and in future volumes is intended to assist aquafarmers in overcoming some of the technical constraints of operating a business for the production of ornamental fish in Hawaii. Unless stated otherwise, the methods described have been field-tested in Hawaii. The reader should be aware that the methods described are not the only methods to produce the target ornamental fish species. One characteristic of Hawaii is the diversity of habitats and microclimates throughout the island state. While a particular method presented may be suitable for one area, modifications may be necessary to achieve similar production results from one location to another. The authors encourage farmers to apply their individual experience and expertise in order to interpret and adapt the material presented.
Likewise, although this manual is directed to the culture of C. tetrazona, the methods described are also applicable to other members of the barb family, which have similar reproductive strategies.
In the context of these "How To" manuals on the commercial production of ornamental fish, some terminology will be used to generally group fish into certain production modes based on their reproductive life history. The four major modes of reproduction in ornamental fish production are described as follows:
Table 1. Barb species related to Capoeta tetrazona |
|||
| Species
Barbodes |
Common Name | Species
Puntius |
Common Name |
|---|---|---|---|
| stoliczkanus | tic tac toe barb | conchonius | rosy barb |
| hexazona | six banded barb | cumingii | cuming's barb |
| pentazona | five banded barb | nigrofasciatus | black ruby barb |
| everetti | clown barb | ticto | tic tac toe barb |
Table 2. Summary of top 20 freshwater ornamental fishes |
|||
| Common Name | Scientific Name | Percentage of Total Fish Imported | Number of Individuals Imported in millions |
|---|---|---|---|
| Guppy | Poecilia reticulata | 25.8% | 51.9 |
| Neon tetra | Paracheirodon innesi | 11.3% | 22.7 |
| Platy | Xiphophorus maculatus | 5.4% | 10.9 |
| Siamese fighting fish | Betta splendens | 2.7% | 5.4 |
| Goldfish | Carrasius auratus | 2.4% | 4.8 |
| Chinese algae-eater | Gyrinocheilus aymonieri | 2.4% | 4.8 |
| Shortfinned molly | Poecilia sphenops | 2.0% | 4.0 |
| Cardinal tetra | Paracheirodon axelrodi | 1.5% | 3.0 |
| Glassfish | Chanda lala | 1.5% | 3.0 |
| Tiger barb | Capoeta tetrazona | 1.3% | 2.6 |
| Red oscar | Astronutus ocellatus | 1.2% | 2.4 |
| Yucatan molly | Poecilia velifera | 1.1% | 2.2 |
| Redtail black shark | Labeo biocolor | 1.0% | 2.0 |
| Coolie loach | Acanthopthalmus kuhlii | 1.0% | 2.0 |
| Sucker catfish | Hypostomus plecostomus | 0.9% | 1.8 |
| Harlequin rasbora | Rasbora heteromorpha | 0.9% | 1.8 |
| Angelfish | Pterophyllum scalare | 0.8% | 1.6 |
| White cloud | Tanichthys albonubes | 0.5% | 1.0 |
| Green corydoras | Corydoras aeneus | 0.2% | 0.4 |
| Leopard corydoras | Corydoras julii | 0.1% | 0.2 |
| Total | 64.0% | 128.6 | |
However, as stated by Zakaria-ismail (1993), "from my ongoing osteological
studies that have been classified under Puntius, the genus Barbodes
cannot be properly defined." Today we are left with three generic classifications,
Barbodes, Capoeta and Puntius, all of which appear
in the literature when referring to tiger barbs and other barb species.
The current taxonomic status of the tiger barb, presented in Figure 1,
hints that the taxonomy of the species is far from being settled. To commercial
breeders, however, this fish will most likely always be referred to as
the tiger barb.
| ORDER | Cypriniformes |
| SUBORDER | Caracoidei |
| FAMILY | Cyprinidae |
| SUBFAMILY | Cyprininae |
| GENUS | Capoeta (Barbodes, Puntius) |
| SPECIES | tetrazona |
Figure 1. Current taxonomic status of the tiger barb. |
|
Figure 2. Natural geographic range of the tiger barb in Sumatra, Borneo, Malaysia, Thailand, and possibly Cambodia.
Figure 3. Illustration showing the location of black body marks (modified
from Taki et al. 1977).
| Abbreviation key: | |
| AB = anal-basal marking; | CD = caudal marking; |
| NC = nuchal marking; | OB = orbital marking; |
| PA = post-anal marking; | PC = pectoral marking; |
| SA = supra-anal marking; | SD = subdorsal marking. |
Table 3. Common black bar markings and patterns of related barb species. |
|
| Body Type | Body Markings or Patterns |
|---|---|
| Type A | Body plain or having a caudal spot that tends to fade with age. |
| Type B | Bars in orbital, supra-anal and caudal fin positions. |
| Type C | Bars, spots, or blotches in the pectoral, subdorsal, supra-anal and caudal positions; an orbital marking may or may not be present. |
| Type D | Pectoral, subdorsal, supra-anal, anal-basal, post-anal, and caudal spots or blotches that may be indistinct, absent or connected to each other in any combination. |
| Type E | Bars or round blotches in the nuchal, subdorsal, supra-anal and caudal positions. |
| Type F | Pectoral, postanal and caudal bars or blotches. |
Table 4. Common barb hybrids representing different color patterns. |
||||
| Parent Species | Common Name | X | Parent Species | Common Name |
|---|---|---|---|---|
| conchonius | rosy barb | x | stoliczkanus | tic tac toe |
| cumingii | cuming's barb | x | stolickanus | tic tac toe |
| stoliczkanus | tic tac toe | x | cumingi | cuming's barb |
| nigrofasciatus | black ruby | x | stoliczkanus | tic tac toe |
| stoliczkanus | tic tac toe | x | nigrofasciatus | black ruby |
| cumingi | cuming's barb | x | nigrofasciatus | black ruby |
| nigrofasciatus | black ruby | x | conchonius | rosy barb |
| tetrazona | tiger barb | x | nigrofasciatus | black ruby |
| conchonius | rosy barb | x | tetrazona | tiger barb |
| stoliczkanus | tic tac toe | x | tetrazona | tiger barb |
| Note: According to common scientific nomenclature the female parent is given first. | ||||
Figure 4.
Change in morphology
of tiger barbs
during development.
Top to bottom:
5.3 millimeters,
6.0 millimeters,
7.3 millimeters,
10.1 millimeters
and
25.0 millimeters.
(Illustrations by
Rich Bailey).
The length versus weight relationship of C. tetrazona was determined from samples of tiger barbs reared at Windward Community College (WCC) at Kaneohe, Hawaii, and is summarized in Figure 5. The statistical model:
where LNWT = natural log of body weight in grams and TL =
total body length in millimeters was found to provide the best fit
of the data, R2 = 0.95, P<0.001. The relationship
can be used to estimate body weight when only total body length is available.
Figure 5. Length versus weight relationship of tiger barbs.
A summary of the common reproductive behavior for most of the barbs
was described by Bakker et. al. (1982) as follows:
Tiger barbs have been documented to spawn as many as 500 eggs per female
(Scheurmann 1990; Axelrod 1992), and production records at the WCC aquaculture
site show similar results. It has been reported that the tiger barb is
a serial spawner (i.e., spawning more than once during the spawning season)
and with proper conditioning females can spawn at approximately two-week
intervals (Munro et. al. 1990).
An experiment carried out at the National University of Singapore, in
which female barbs were held under a natural photo-period of 12 hours light
and 12 hours dark at temperatures of 26°C to 28°C, reported ovulation over
a two-day period. Overripe eggs, which are opaque and white, were extruded
from the ovaries up to four days after ovulation, with post-ovulatory follicles
persisting for two days at most. Yellow atretic eggs appeared two days
after ovulation and have been reported to persist for up to 14 days (Munro
et. al. 1990).
Figure 7. Size frequency distribution of spawned tiger barb eggs.
where TL = total body length in mm and Days = number of days
in culture, was found to provide the best fit of the data (R2
= 0.91 1, P<0.001). As mentioned previously, the size at first maturity
ranges from 20mm to 30 mm (0.8-1.2 in) and is indicated as the arrow in
Figure 8. The calculated age at first maturity using 20 mm (0.8 in) as
the size at first maturity was 51 days. The size frequency distribution
of the tiger barbs at the end of the rearing trial is summarized in Figure
9. A pooled sample of barbs (n = 88) was distributed using 3-mm size classes,
and the observed average body length was 29.3 ± 4.2 mm (1.2 ± 0.2 in). Figure 8. Growth of tiger barbs reared at 27°C. Arrow indicates size/age
at first maturity.
Figure 9. Size frequency distribution of tiger barbs after 101 days
in culture.
Conditioning the sexes in separate tanks is an important step in the
production process. Lack of proper conditioning will result in greatly
reduced numbers of successful synchronized spawnings. It cannot be overemphasized
that during conditioning of the broodstock good water quality should be
maintained as the conditioning diets can lead to fouling of the water.
In addition, subtle changes in water quality can reportedly influence spawning
of tiger barbs. Spawning experiments where water from tanks in which males
were kept during the conditioning process resulted in an overall reduction
in the incidence of ovulation of females relative to controls in the spawning
tanks (Munro et al. 1990). Other studies have reported that a decrease
in salinity of 10 to 20% may induce or force synchronized ovulation (Munro
et al. 1990; Axelrod 1992). Successful synchronized spawnings have taken
place at the WCC aquaculture facility by simply moving broodstock from
the conditioning tanks to those with fresh clean water.
The process for spawning the tiger barbs after conditioning is as follows:
Paired fish are allowed only two days to spawn, after which they are
removed from the spawning tanks. The hatchery is then cleaned and prepared
to receive another batch of conditioned broodstock. After the egg-filled
brushes and broodstock have been removed, the spawning tanks may be immediately
restocked for another spawning run. If conditioned broodstock are available,
a simple hatchery of 40 to 50 10-gallon tanks can produce roughly 10,000
tiger barb larvae per week.
The tiger barb, like many cultured fish, has a digestive tract that
is very inefficient in digesting feed. Dividing the total daily amount
of feed to be delivered into three or more portions throughout the day
will eliminate an excess of uneaten feed and reduce the organic fouling
and oxygen demand on the system, while promoting faster growth. Automatic
feeders work well in culturing tiger barbs, whereby they are filled in
the morning with the appropriate amount of feed needed for the day. Tiger
barbs exhibit a diurnal pattern in their activity. They cease being active
between 22:00 and 04:00 hours and have a peak in activity between 14:00
and 18:00 hours (Shiraishi et. al. 1972). Pond reared fish receiving
a single feeding should be fed between 14:00 and 18:00 hours, and high
density tank culture systems utilizing automatic feeders should be turned
off between 20:00 and 06:00 hours.
Water temperature and quality directly influence the desire of fish
to feed. When temperatures drop below 20°C, tiger barbs will consume less
feed. During cold weather conditions, it is best to feed late in the afternoon
when the water temperatures have had a chance to elevate from solar radiation.
Periodically checking the feeding response and the amount of feed remaining
on the bottom of the tank or pond will help to determine the proper amount
to feed. Feed should be completely consumed within 15 minutes after delivery.
If all the feed has been consumed in that time period, present a little
more to determine the satiation point of the fish. There is no documentation
on the feed conversion ratio (FCR) or the percentage of body weight per
day requirements of tiger barbs or for many other ornamental aquarium fish.
By comparing data for fish that have a similar size and biological characteristics,
tiger barbs should be fed approximately 10% of their body weight per day.
Figure 14. Photo of two types of traps used to collect tiger barbs.
Figure 15.
Monogenea (Dactylogyrus and Gryclactylidae) are also commonly
found on the gill and soft ray tissue of the infected fish. Transmission
is usually by direct contact. After the eggs hatch, free-swimming larvae
seek a host and attach themselves using a series of hooks and sucking valves
at the base. They appear worm-like under the microscope. Infected fish
usually exhibit what is commonly called flashing, in which the fish rub
on a hard substrate or shake in attempts to remove the parasite. There
are two common treatment methods. The first is a formalin bath at a concentration
of 250 ppm for one hour. This is the preferred method when handling large
numbers of fish because no handling is required and the tank is simply
flushed after the specified time period. The second method is a sodium
chloride (non-iodized salt) dip at a concentration of 25,000 to 35,000
ppm (25 grams per liter to 35 grams per liter). Duration of the dip is
determined by the tolerance of the individual species to high salinity
and the effectiveness of the treatment. It is recommended that preliminary
tests be run on small samples of fish to determine the proper length of
time and concentration.
The fungi Saprolegnia commonly occurs as an opportunistic infection
as a result of injuries incurred in handling the fish. It usually appears
as a white or light gray patch on the surface of the fish. Its appearance
under the microscope is best described as having a cotton strand appearance.
Saprolegnia can be problematic to treat because as of this writing
some of the most effective compounds have been regulated out of use. However,
some of the newer copper and iodine compounds work well. One of the tried-and-true
methods is a formalin bath at a concentration 250 ppm for one hour per
day for five consecutive days.
For smaller water volumes, a stock solution of 10 percent formalin (90
milliliters concentrated formalin + 910 milliliters of water) is first
made. By adding 1 milliliter of the 10 percent formalin stock solution
to 1 gallon (3.8 liters) of water, a 25-parts-per-million formalin solution
is obtained. Adjust the amount of stock solution to the number of gallons
of water to result in the desired concentration (e.g., 2 milliliters per
gallon = 50 parts per million; 4 milliliters per gallon = 100 parts per
million; and so forth). Multiply by the number of gallons of water to be
treated to obtain the proper amount of stock formalin solution needed (e.g.,
4 milliliters per gallon = 100 parts per million; for a 10-gallon tank,
4 x 10 = 40 milliliters of 10 percent formalin stock solution is needed
to result in 10 gallons of 100-parts-per-million formalin).
Recommendation: Some test trials with healthy fish should be
attempted prior to any disease outbreak to become familiar with the calculations
described above. If there are any concerns, please contact the Sea Grant
Aquaculture Extension Agents.
Figure 16. Comparison of prices of three types of tiger barbs at
different body sizes.
From this pricing scenario, it can be concluded that the tiger barb
is a "low value" species and consistent production of large quantities
(10,000 to 20,000 per month) is necessary to turn a profit as well as to
compete in the market. As mentioned previously, more than 2.5 million individual
C. tetrazona, were imported into the United States in 1992. To estimate
the future demand for this species, price sheets from the last 15 years
were examined and the continued increase in price over time indicates a
consistent and continued market demand. The data are summarized for both
the tiger barb and albino tiger barb in Figure 17.
Figure 17. Comparison of prices for 31-millimeter (1.25-inch) tiger
barbs and albino tiger barbs over a 15-year period.
Another factor affecting farm-gate prices is whether one sells directly
to a retailer (highest price), to a wholesaler (moderate price) or through
a transshipper (lowest price). Farmers should investigate market outlets
thoroughly to obtain the highest possible price for each item produced.
It is also recommended that a farmer have at least three to five different
market outlets and provide the one offering the highest market price with
the largest percentage of fish produced.
The report modeled three different farm sizes (small = Farm A, medium
= Farm B and large = Farm C) with three different levels of production
and ornamental species mix. Farm A represents a live-bearer production
module, which is elaborated on by Tamaru et al. (in press). Farm B consists
of 50 12-foot-diameter tanks and includes a 1,200-gallon hatchery. Farm
C consists of 200 12-foot-diameter tanks and a 2,500-gallon hatchery. Using
two different pricing scenarios, "all three farms in the study proved to
be profitable to own and operate" (Teichman et. al., 1994), and showed
that Hawaii farmers could compete with a landed cost in Seattle from suppliers
of fish from Asia and still turn a profit. Hawaii farmers have a substantial
advantage over competitive suppliers of fish from Asia because Hawaii-raised
fish require less time in transit, so farmers can emphasize product quality
(e.g., lower percentages of dead on arrivals, high health) as a primary
marketing strategy. They need not rely solely on price competition to sell
their products.
For the purposes of this manual, the production costs of tiger barbs
in multi-species Farms B and C are considered. A breakdown of the equipment,
supplies and start-up costs for a single species (tiger barb) hatchery
is presented in Table 7. The equipment and supply list covers what is considered
necessary to build a hatchery for the production of tiger barbs and also
includes shipping of the cultured product. Based on 1993 pricing of materials,
the total cost is estimated at $10,353. Using the average number of eggs
produced per female (300 eggs per spawn) and multiplying by the number
of spawning tanks (n = 25) approximately 7,500 eggs can be produced per
synchronized spawning event. If this activity is carried out at two-week
intervals, the monthly egg production of the facility can be estimated
to be approximately 15,000 eggs per month. It should be noted that the
start-up costs do not include labor, power, water, lease fees, or insurance
costs as these will vary from farm to farm.
The total variable costs of production are estimated at $568.00. The
fixed costs are estimated at $56 to $63 based upon estimates given in the
"Report on the Economics of Ornamental Fish Culture in Hawaii", (Teichman
et al., 1994). This results in an estimated $624.63 total monthly production
cost. Using the market value of medium-size tiger barbs ($0.24 per fish,
Sunny Aquarium Company 1995) the value of 10,000 tiger barbs is $2,400.
The net profit of the tiger barb enterprise is approximately $1,800 per
month. It should again be emphasized that these prices are based upon only
one distributor and may vary from dealer to dealer. In addition, as mentioned
previously, the actual farm-gate price can only be estimated as these values
are confidential. However, with a 30 percent mark-up, the estimated farm-gate
value would be approximately $1,050. From the information presented, there
are several strategies that one must consider in order to maximize profits.
These include marketing smaller fish at higher volumes, marketing larger
fish, or producing another variety that commands a higher price. Using
the enterprise budget allows the reader to examine the pros and cons and
to plan a particular strategy appropriate for his/her situation.
There is nevertheless a wide variation in mating behavior between species
and subspecies.
Fecundity
An average of 300 eggs can be expected from each female per spawn in a
mature broodstock population, although the total number of eggs released
will increase with the maturity and size of the fish. Spawned eggs are
adhesive, negatively buoyant in freshwater and average 1.18 ± 0.05 mm in
diameter. Figure 7 shows the pooled size frequency distribution of eggs
spawned from five mating pairs. Some variation in average egg size was
detected among the five spawnings, but the size variation may not have
any biological significance.
Growth
To obtain a growth profile of tiger barbs (Figure 8), a rearing trial was
conducted at WCC from October 1 through December 26, 1995. Tiger barb larvae
were obtained (as described in a later section) and stocked into a 40-liter
(10-gallon) tank and later stocked into a 9,500-liter (2,500-gallon) tank
kept outdoors and covered with clear plastic sheets. Samples of fish were
obtained at weekly intervals, and the length of the rearing trial was 101
days. Average water temperature during the trial was recorded at 27°±0.7°C.
The data were subjected to regression analysis and the statistical model:
Commercial Production
Broodstock Conditioning
Tiger barbs that are going to be used as broodstock (e.g., 20 to 30 millimeters
or 0.8 to 1.2 inches body length) are first collected from a production
pond or tank and sorted with size graders. The fish are then separated
by sex using a glass-top sorting table. Sexually mature females are identified
by a full round abdominal region, and sexually mature males are identified
by bright red colors on the fin rays. Fish that have undesirable color,
poorly defined bar or black band patterns, or deformities are discarded.
The selected broodstock are then placed by sex into separate conditioning
tanks. The conditioning tanks can be circular, square, or rectangular,
but the rectangular tanks are more efficient for removing and selecting
broodstock. Injuries as a result of handling can be minimized with the
use of the proper size of dip net in relation to the size of the tank.
A stocking density of 1 fish to 4 liters (approximately 1 fish per gallon)
is recommended. The conditioning tank should be provided aeration and water
exchange at a rate of 20% per day. Separation of the sexes elicits a synchronization
of spawning that results in a large number of fry at the same time. The
separated fish are conditioned by a diet of frozen blood and/or tubifex
worms, Artemia, a high quality flake or a prepared paste (see Appendix
1) at least two or three times per day to satiation for a period of two
weeks.
Spawning
Tiger barbs and related species are generally easy to breed, requiring
only minor but important manipulations in broodstock conditioning, water
quality, and spawning substrate. Commercial breeding hatcheries of tiger
barbs are designed to maintain light levels either indirect or very subdued
and walking traffic to a minimum. The hatcheries often hold several hundred
spawning tanks that are utilized at a single time to produce large numbers
of fish of similar size per trial (Figure 10).
Step 1. Stocking the spawning tank
Single pairs of broodstock fish are placed into 40-liter (10-gallon)
glass aquaria with little or no aeration. A stiff bottle brush (Figure
11) that is used as a spawning substrate is placed in each spawning tank
in the late afternoon of the same day that spawning pairs are introduced
to the tanks. Other spawning substrate materials, such as rayon knitted
yarn are also used by commercial producers (Figure 12). The stiff spawning
brush functions as the substrate on which the sticky eggs are laid, prevents
the broodstock from eating the spawned eggs, and is easily cleaned between
spawnings.Step 2. The following morning:
The morning after stocking, check each aquarium for eggs and be careful
to note which pairs of fish might currently be spawning so that you do
not disturb them. If a flashlight is shined up from the underside of the
tank, spawned eggs can be seen as small translucent yellowish spheres averaging
1.18 ± 0.05 mm in diameter adhering to the stiff brush.
Step 3. After spawning:
Egg-filled brushes are removed from the spawning tanks and placed in
other tanks for incubation and larval rearing. The broodstock are returned
to the conditioning tanks for further conditioning or holding. Fish that
are exhibiting spawning behavior and others that have not yet spawned are
allowed to remain in their spawning tanks for an additional day.
Larval Rearing
Larval culture is characterized by the introduction of various feed types
during the development of the larvae. Feeds customarily used can vary in
size, quality, and quantity during the course of the rearing process. A
schematic of the feeding regimen used for rearing the tiger barb larvae
is presented in Figure 13.
Step 1. Preparation of the incubation and rearing tank:
The size of the incubation and larval rearing tank is determined by
the potential number of fry, and the volume of brushes it can hold underwater.
A rule of thumb for stocking is to use approximately twenty brushes containing
spawned eggs to each 120-liter (30-gallon) horizontal glass aquarium. The
larval-rearing tank is prepared by first treating with methylene blue or
other antifungal agent according to instructions specific for disinfecting
eggs. Constant aeration and a water flow rate sufficient to prevent the
water from becoming cloudy should be provided. The level of aeration and
rate of water exchange should be gentle, yet still high enough to maintain
good water quality during the entire larval rearing cycle.Step 2. Hatching:
Spawning brushes containing the sticky eggs from the spawning tanks
are placed into the tanks prepared to hold the hatched larvae. The eggs
should hatch in three days if a temperature of 25°C to 27°C (78°F to 80°F)
is maintained. The newly hatched fry are non-swimming for two days and
obtain nutrition from the yolk sac, so the fry do not require feeding at
this time. Three days after hatching the yolk sac is usually absorbed and
disappears.Step 3. First feeding:
When fry are approximately 4.0 mm (0.16 in) in body length at three
or four days after hatching and/or free swimming, feed should be introduced.
It should be noted that the hatching of larvae may vary, resulting in the
presence of larvae at different stages of development. Initial feeding
must begin when the first larvae with a fully absorbed yolk sac are observed.
Newly hatched brine shrimp, Artemia sp., approximately 500 m (0.02
inches) in size is introduced as the first feed and used exclusively for
the next two days. The method for preparation of brine shrimp eggs for
hatching is presented in Appendix 2. The fry should be fed to satiation
three or four times per day. Satiation is determined by the observation
of reduced feeding in the fry and a gut area that has become round and
orange in color (indicating brine shrimp in the stomach). Care should be
taken not to over-feed and to maintain good water quality in the larval-rearing
tank at all times.Step 4. Feeding protocol:
Overfeeding with brine shrimp and/or high protein larval feeds can
quickly pollute the water. Adjust the feeding rate according to the amount
of debris on the tank bottom and observe water quality. Feeding more often
with smaller rations can lessen the risk of elevated ammonia levels that
can easily kill fry. After feeding brine shrimp exclusively for two days,
prepared commercial fry feed should be introduced. Fish should be slowly
weaned onto new feeds by alternating small amounts of prepared feeds with
brine shrimp nauplii over the course of a day. When weaning fish to a new
feed, daily introduce 10% of the new food while reducing the same percentage
of the first feed until 100% of the new food is accepted. Fish are sometimes
reluctant to accept new feeds but slowly weaning off one and onto a new
feed can reduce the amount of wasted feed in a tank. It is important to
remember that excess feed can rapidly lower water quality. The feed weaning
process can be completed in three to five days. A number "00" size (0-
to 5-mm diameter particle size) or "swim-up" feed having the consistency
of fine powder is often used when weaning fry to commercially available
feeds. Once the fry have been successfully weaned to a commercial fry diet
for two days and are approximately 5.0 mm (0.2 inches) in length, they
can be transferred to prepared outdoor nursery tank(s) or directly stocked
into a growout pond or tank.Step 5. Harvesting and moving fry:
Once fry have been actively feeding for two to three days, they can
be stocked into a growout pond or tank. Growout ponds or tanks should be
prepared (See Next Section) and stocked no later than 1 0 days after being
filled with water to avoid problems that would develop with aquatic weeds
and/or establishment of predatory aquatic insects. Fry transfer should
take place during the morning and care must be taken to avoid extreme differences
in temperature, pH and light intensity. Fry can be removed from the rearing
tank by siphoning with tygon tubing that has at least a 3/8-inch inside
diameter. Fry are siphoned into a bucket that has a 100 m screened section
that has been cut into the wall of the bucket about three to four inches
from the top of the bucket. This allows the fry to be collected into a
reservoir of water in the bucket and excess water to drain out without
harming the collected fry. The bucket containing the fry can then be taken
to the pond or tank where they can be acclimated before stocking.
Preparing Outdoor Ponds and Tanks for Stocking of Fry
Outdoor nursery or growout ponds or tanks must be properly prepared prior
to stocking with hatchery fry. A high number of fry are usually lost shortly
after stocking from the hatchery due to improper preparation or lost during
harvests due to less than optimal harvesting conditions.
Pond, Tank Preparation, and Aquatic Weed Control
Step la. Pond preparation:
Earthen ponds for growout of tiger barbs should first be sun-dried
until the bottom cracks. This process allows for the decomposition of organic
matter that has built up in a pond during the last production cycle.Step 1b. Tank preparation:
Growout tanks can be of various shapes and sizes and constructed out
of various materials (e.g., high-density polyethylene, canvas-lined plywood).
The size of the growout tank should match the egg production capability
as stocking densities are based upon the working volume of the tank. Stocking
densities of 1 to 5 fry per liter (4 to 20 fry per gallon) are recommended,
although higher stocking densities have also been reported. All growout
tanks should be equipped with continuous aeration and water supply. A recommended
rate of water exchange for a 12- to 15-foot-diameter tank is 1/4 to 1/3
gallon per minute. It is best to clean the tank and allow it to sun-dry
for at least two or three days prior to filling and stocking.Step 2. Weed control:
Emerging weeds should be removed either by hand or by an approved herbicide.
In the event that herbicides are used, an agricultural extension agent
should first be consulted for assistance in obtaining the proper permits
and methods for application. Herbicides such as Casaron, which is a broadcast
herbicide that is effective on rooted aquatic and terrestrial plants, Diquat,
which is particularly effective on a wide range of aquatic plants, or Sonar,
which is effective on rooted aquatic and semi-aquatic plants, can be used.
NOTE: When using any herbicide, follow the label directions for
proper application.
When treating ponds currently in production that are heavily infested
with aquatic weeds, extreme care must be taken to minimize possible low
dissolved oxygen levels that can result from decomposing plant matter.
Under such conditions, it is recommended that only one half of the pond
be treated at a time. Additionally, ponds should only be treated during
sunny, mild temperature, and breezy weather conditions that allow for optimal
oxygenation of the pond water while the organic matter is decomposing.
If aeration equipment is available, 24-hour aeration can eliminate a low
oxygen level problem while treating aquatic weeds with herbicides.Step 3a. Pond fertilization:
After elimination of the vegetation, the pond should be filled as soon
as possible and fertilized to obtain an algal bloom or "green water." A
liquid fertilizer with a N-P-K (nitrogen-phosphorus-potassium) ratio of
1-3-0 is recommended. This is generally mixed as a 10-30-0 or a 12-36-0
ratio and can be purchased from local distributors (see Appendix 3). The
fertilizer is applied at a rate of 1 milliliter per 5 square feet of surface
area or 3 to 5 gallons per acre of pond water. Inoculating the pond with
green water from another pond or tank will speed up the establishment of
an algal bloom. Once the bloom has been established (which usually takes
only two or three days) the fish can be stocked into the pond. If delays
in stocking the pond are encountered, the water should be checked for the
presence of aquatic insects.Step 3b. Tank fertilization:
In tanks, fertilizer is applied at a rate of 1 milliliter per 50 liters
(13 gallons) of water. Inoculating the tank with green water from another
pond or tank will speed up the time to establish an algal bloom. Once the
bloom has been established (which usually takes only two or three days),
the fish can be stocked into the tank. If delays in stocking the tank are
encountered, the water should be checked for the presence of aquatic insects.Step 4. Controlling aquatic insects:
Aquatic insects (e.g., dragonfly nymphs, water boatmen, and backswimmers)
can pose a serious predation threat to larval fish if not controlled. Stocking
a pond or tank soon after the algal bloom has stabilized allows the fish
fry to grow to a size where larval insects pose less of a predator problem.
To further reduce the insect problem, netting with 1/4-inch or smaller
mesh placed securely over the pond or tank restricts adult flying insects
from depositing eggs and reproducing. The pond or tank should be checked
periodically for insect infestation. If infestation is detected, quick
measures must be taken to reduce fry losses. Applying boiled linseed oil
at a rate of 1 to 2 milliliters per 5 square feet of surface area can eliminate
most aquatic insects. The linseed oil will cover the surface of the water
and essentially suffocate the air breathing aquatic insects. The linseed
oil will slowly dissipate as it evaporates from the water surface over
the next few days. For assistance, notify the University of Hawaii Sea
Grant Extension Service (SGES) aquaculture extension agents.
Tank, Pond, and Cage Growout System Comparison
Pond Culture
Traditionally most growout of ornamental fish takes place in earthen ponds
because of reduced construction costs and because the bottom soils support
a healthy natural food chain (phytoplankton and zooplankton) from which
the fish to feed on. However, earthen ponds tend to have emerging aquatic
weed problems and because of their size preventing bird and insect predation
with netting may be more difficult. Additionally, they often require more
than one person to harvest and bottom debris must be removed prior to transfer
of fish.
Tank Culture
Large circular tank culture eliminates aquatic weeds, frog/toad infestations,
can be harvested by one person, can be easily covered with netting to reduce
insect problems, and allows for more effective measures in treating for
pathogens. The phytoplankton and zooplankton population densities in "green
water" tank culture of systems, in comparison to an earthen pond culture
are not very significant. However, tank culture requires more supplemental
feeding than earthen pond culture systems. The additional amount of feeds
used in tank culture does not add significantly to the overall production
costs of a tank growout operation versus an earthen pond growout operation.
Cage Culture
Cage culture in large ponds falls somewhere between tank and pond growout
culture in terms of ease and productivity. Cage operations in large ponds
can benefit from the natural productivity of the food chain, while still
being manageable by one person when harvested. Having a number of cages
per pond allows for multiple species production in and out of the cages
as well as for stocking fish at various sizes or ages. However, cages do
foul and periodically require cleaning or replacement of the netting material.
For established farms with large production ponds for other species, cage
culture of ornamentals serves as an alternative and cost-effective way
to diversify production.
Commercial Grow-out Stocking Densities
Tiger barbs are well adapted to high-density culture. Stocking densities
as high as 10,000 fry per cubic meter in systems designed for high-density
culture have been achieved (personal communication, Dallas Weaver, 1995).
It has been reported that stocking densities of 400 to 450 individuals
per square meter or greater results in reduced growth rates (Tay and Tan
1976). Extrapolating from stocking densities used by Tay and Tan (1976),
tiger barb production can exceed 500,000 fish per acre per year.
Feeds and Feeding
The nutritional composition of feed plays a significant role in growth,
coloration, and overall health of ornamental fish. When culturing fish
at high densities it is important to feed a diet of the proper proportion
of protein, lipid, carbohydrate, vitamins and minerals. This is especially
true for tank culture systems. Although tiger barbs are considered omnivorous,
gut analysis of wild-caught fish indicate that they prefer a more vegetative
diet. One study done in Malaysia found fish with 15 different types of
phytoplankton, one source of higher plant tissue, four different types
of zooplankton and both aquatic and terrestrial insects in the guts (Shiraishi
et al. 1972). Stomach analyses of other barb species have shown similar
results (Kortmulder 1982). A good growout feed for tiger barbs should be
at least 28% to 32% total protein by weight, and the source should be high
in essential amino acids and highly unsaturated fatty acids (HUFA). As
a rule of thumb, larval fish require high levels of total protein in their
diets (30 to 45%). As the fish grows, less total protein is needed (e.g.,
minimal level of 28 percent to 32 percent). The quality of the available
protein is an important factor when choosing the proper feed. Not much
information is available on the nutritional requirements of tiger barbs;
however, general nutritional requirements of tropical warmwater fish do
not seem to vary greatly between species (National Research Council 1983).
As more information on the nutritional requirements of aquarium fishes
becomes available, manufacturers will incorporate refinements into commercial
feeds. Feeds that can be used for growout of tiger barbs are listed in
Table 5.
Although the feeds listed are suitable for production of ornamental species,
it should be noted that they contain higher protein levels than required.
Fish in earthen ponds are fed once a day ad libitum with a commercial
diet containing a minimum of 28 percent to 32 percent protein. Many of
the pigments required by tiger barbs for good coloration are obtained from
naturally occurring phytoplankton (green water) and zooplankton feed sources.
However, tiger barbs reared in high-density tank culture systems should
be fed a complete diet that includes a color enhancing agent, such as astaxanthin,
at least two times per day to supplement natural feeds that might be limited
in this type of culture system. It usually takes at least one month for
the fish to show color changes resulting from pigmented feeds.
Table 5. Commercially available feeds
suitable for high-density tiger barb growout.
Feed
Feed Type
Rangen Trout
Swim-up #1 and #2
Purina Trout
00, 01 and 02
Moore Clarke Salmon
Nutrafry, #O, #1 and #2
Water Quality
Tiger barbs can tolerate extreme variations in water chemistry and thrive
in water with a hardness from 100 to 250 ppm of CaCo3, (moderately
hard) and a pH of 6.5 to 7.5 (Baensch and Riehl 1982; Scheurmann 1990).
No data is available regarding tolerances of tiger barbs to various salinities
and is an area of future investigation. Water quality parameters for optimal
growth, survival and reproduction are summarized in Table 6.
Table 6. Optimal water quality parameters for commercial production of
tiger barbs.
Water Quality Parameters
Ranges
Temperature
22°C to 28°C or 72°F to 82°F
Hardness
100 TO 250 milligrams per liter CaCo3
pH
6.5 to 7.5
Total ammonia (NH3 + NH4)
< 1.0 milligrams per liter
Dissolved oxygen
> 2.0 milligrams per liter
Phytoplankton
Secchi reading of 30 to 40 cm
Harvesting Tiger Barbs
Step 1 - Preparation for harvesting from a pond:
Prior to any harvesting, a pond should be inspected for aquatic weed
infestation and the appropriate herbicides applied, if necessary, with
the proper lead time. Tank culture systems avoid problems with emerging
aquatic plants and lessens the degree of management and harvesting problems.Step 2. Disease inspection:
One week before harvest, the fish should be sampled and examined for
disease and proper treatment applied if necessary. Treatment of disease
will be covered in the disease section. Fish should then be sampled again
prior to harvest to guarantee that the fish are in good health. Following
these procedures insures a smooth harvest and minimizes mortalities.Step 3. Holding Tank:
As soon as possible after harvesting by any of the described methods,
the fish should be placed in a 300- to 500-gallon holding tank equipped
with running fresh water and aeration. Preparation of the holding tank
must be completed prior to harvesting to avoid delays between the time
of capture and stocking in the holding tank(s). Special attention should
be given to screening the drain to prevent fish from escaping. The size
of the screening is also important to consider because large amounts of
debris will be added to the tank with the incoming fish, and this can clog
the screen covering the drain and result in a holding tank that is overflowing.
After placing the fish inside the holding tank(s), any debris that has
come in from the harvest should be removed and dead or injured fish discarded.
Salt is added to the water to bring the salinity up to 9 ppt (9 kilograms
per cubic meter or 20 lbs per 250 gallons), which is an isotonic solution,
to help reduce handling stress by stimulating fish to naturally produce
a slime coat. Harvested fish can be maintained in the holding tank for
an extended (one to two weeks) period of time before fish are selected
and marketed. A maintenance diet is provided to the fish in the holding
tanks.Step 4a. Harvesting by trap:
Tiger barbs can be harvested using a variety of traps (Figure 14) or
seined. When trapping barbs, place the trap 12 to 18 inches below the surface
and bait the trap with either a paste or large pelleted feed. Traps should
be checked periodically to avoid overcrowding. Transfer the collected fish
into the holding tank. Debris that is collected with the harvested fish
should be removed along with any dead fish. The fish are examined the day
before sorting to insure good health. If bacterial or other pathogens are
present, the holding tank should be treated prior to further handling.
Step 4b. Harvesting with a seine:
Tiger barbs can also be harvested with a seine net made of knotless
nylon Ace or Delta weave with a mesh size of 1/8 inch. Seine nets should
have a length 2.5 times the width of the pond being harvested and a width
twice the depth of pond being seined. Seines used for harvesting ornamental
fish should also be equipped with twice as many floats and bottom lead
weights as standard seines. When ordering seines of this type, the buyer
must specify double floats and double leads. It is essential that all debris
and filamentous algae be removed from the pond prior to seining. This usually
requires manually removing the unwanted material. After removal of the
aquatic vegetation and debris, the seine is pulled through the pond. particular
attention should be given during the last stages when bringing in the seine
near the pond bank to insure that the fish are not overcrowded. This is
generally done by stretching and opening the seine to form a "hammock"
or "purse." The fish will then swim out of any trash and mud that may have
been brought in with the seine; they then can be removed from the seine
with dip nets, leaving the debris behind. If all fish are to be collected
and placed in a holding tank, the fish caught in the seine should be placed
in buckets containing fresh water and transported immediately to the holding
tank. Several passes through the pond can be made until the numbers of
fish decline noticeably. At that time, the pond depth can be lowered by
at least one half, and the process repeated. Lastly, the pond should be
drained and all remaining fish collected and placed in the holding tank.
If the process is not conducted carefully, excessive injuries and stress
to the harvested fish will result in mortalities.Step 5. Sorting:
Tiger barbs are often sold prior to reaching sexual maturity, so sorting
by sex is not necessary. Because tiger barbs are not sexually dimorphic
(i.e., having different color patterns between sexes), they are graded
for size using a bar grader (Figure 15). Fish are netted from the holding
tank and placed into a bar grader. The smaller fish will swim through the
grader bars, while the larger ones are retained in the box. By changing
the widths (grader sizes),any size fish can be sorted by increments as
small as a quarter of an inch. Several test runs with fish might be required
to determine the size grader needed. Market size tiger barbs are usually
sorted using grader sizes ranging from No. 8 to No. 14. During the grading
process, any off-color fish are removed with hand nets and discarded. The
fish are then sorted into bag lot numbers and placed in holding tanks,
where the guts are allowed to purge over a 48-hour period, followed by
bagging and boxing for shipping.
Photo of bar grader
used to sort tiger barbs by size.
Step 6. Bagging and boxing for shipping:
Tiger barbs can be packed at 30 to 40 fish per liter (120 to 160 fish
per gallon) with enough oxygen to withstand 48 hour of transport. Depending
on the distance the fish need to travel, over-packing can reduce the shipping
freight cost to the customer. However, only established packing densities
that have been proven successful should be used; do not assume that just
any shipping density will work. Fish should be counted in bag lot numbers
and placed in containers equipped with flow-through water. These containers
should be made of a durable material that will not break or be damaged
by handling (plastic containers work well). The containers should be equipped
with a standpipe to control the water level, which when removed will allow
the water to drain to a box lot quantity. Although there are several sizes
of shipping boxes and bags, a standard full bag measures 37.5 centimeters
wide, 37.5 centimeters long, and 55 centimeters deep. The extra depth allows
for proper sealing of the bag for shipment. The bag is filled with approximately
8 liters (approximately 2 gallons) of water for shipment. This keeps the
total weight of the packed box just below 9 kilograms (20 lbs.). Following
this procedure enables the packer to gently lift and pour the container
of fish and water into a bag without netting or handling the fish again.
Having the fish counted in box lot sizes will minimize the time needed
to bag the fish. The bag is purged of air by squeezing the bag to the water
level and then inflating with oxygen. To seal the bag, twist the bag top
tightly and wrap with a rubber band or use a banding machine. The bags
are then placed in a Styrofoam box, which in turn is held in a cardboard
box if the fish are to be shipped as individual boxes. The lids of the
cardboard box are taped shut for air cargo shipping. Larger orders can
be consolidated into LD-3 containers in which the cardboard boxes will
not be needed. Consolidating orders and cooperative marketing with other
farmers can open new market outlets because of increased numbers and possible
varieties of fish and decrease the shipping costs to prospective buyers.
Disease
Disease Prevention, Treatment, and Management
The three most common disease problems encountered by commercial fish farmers
are caused by Protozoa (Trichodina), Monogenea (Dactylogyrus
and Gyrodactylidae) and Fungi (Saprolegnia). Trichodina
is a round-saucer or domed-shaped protozoan with cilia. When seen through
a microscope, they are constantly in motion, moving quite distinctly and
rapidly. They most commonly attach to the gills and soft tissue, such as
fin rays. Heavy infestations can cause respiratory problems by causing
the gill tissue to produce excess mucus. Several control methods can reduce
and/or eliminate this parasite from the culture system. The most common
procedure is a bath of formalin at 25 ppm for 24 hours. Once diagnosed
and treated, the fish should be checked daily to monitor the effectiveness
of the treatment. Several treatments may be necessary.
Formalin Preparation
Formalin can be employed as one means of combating all the disease mentioned.
Formalin, a clear aqueous solution of formaldehyde containing a small amount
of methanol, is commonly used as a general fixative for preserving tissues.
Concentrated formalin normally contains 37% to 40% formaldehyde.
Note: Use extreme caution when using concentrated Formalin.
For use as a disinfectant and/or for treatment of parasites, concentrated
formalin is usually diluted to very low concentrations (10 to 300 parts
per million). The equation normally used to determine the amount of formalin
to be used for treating a disease outbreak does not employ the percent
active ingredient because by convention 30 percent to 37 percent formalin
is considered to be a 100 percent active solution. An example of the calculation
to determine the amount of formalin to be used to make a 100 ppm solution
in a 100-liter (26-gallon) tank is as follows:
Note: 1 ppm = 1 milliliter per 1,000 liters
From the above calculation, 10 milliliters of concentrated formalin must
be added to the 100-liter (26-gallon) container to obtain a final concentration
of 100 ppm. Pour the concentrated formalin into the tank and be sure to
distribute it evenly.
Concentrated formalin = (100 liters x (1 milliliter per 1,000 liters)
x (100 ppm)
Economics
Factors Affecting Price of Tiger Barbs
Factors that affect the market for tiger barbs can be understood by examining
price sheets from various distributors. For the purposes of this manual,
the pricing of tiger barbs and some of the related barbs from one trans-shipper
of ornamental fishes out of Singapore (Sunny Aquarium Company) was reviewed.
From the most recent price sheets, it can be seen that tiger barb prices,
like those of all ornamental fishes, are quite variable for different body
sizes and color varieties (Figure 16). The tiger barb ranges in price from
less than $0.10 per fish to $0.33 per fish when the body length is 25 millimeters
and 50 millimeters (1.0 and 2.0 inches), respectively. Likewise, at each
marketable body size, the price of an individual barb depends on the variety,
e.g., regular tiger barb, albino tiger barb, or green tiger barb. The green
tiger barb is approximately three times the price of the common tiger barb
at all of the body sizes. It should be emphasized that the prices represent
what is solicited from the distributor, and the actual farm-gate price
can only be estimated as these values are confidential. A rule of thumb
that can be used to estimate farm-gate price is to subtract 20 percent
to 30 percent of the list price.
(Values obtained from Sunny Aquarium Company 1995).
(Values obtained from Sunny Aquarium Company, Hawaii).
Start-up Costs
The production of ornamental fish has been one of the more profitable types
of aquaculture outside of Hawaii (e.g., in Florida, Singapore, Taiwan,
and Japan). Recently the CTSA-funded project titled Ornamental Aquaculture
Technology Transfer produced an in-depth study titled "Report on the
Economics of Ornamental Fish Culture in Hawaii," which examined the economics
of owning and operating an ornamental culture endeavor. The report, available
through CTSA or SGES, emphasizes that doing business in Hawaii with the
high cost of living, of rent, of water, and of labor presents several challenges
to aquafarmers, in addition to the fact that Hawaii is not a major transshipping
destination. Hawaii does, however, offer several natural advantages, such
as climate, proximity to the US mainland and no federal import duties (e.g.,
US Customs Fee, US Fish and Wildlife Inspectors Fee, airline fuel surcharge,
dock or port fee), all of which can compensate for some of the disadvantages.
Table 7. Equipment and supplies for tiger barb hatchery
Category
Quantity
1995 Price
in US$
Equipment
12-foot-diameter tank
2
$900
ground liner
1 roll
$90
regenerative blower
1
$398
airstones (small)
25
$20
airstones (large)
2
$15
air tubing
1 roll
$27
02 bottle rental
1
$50
02 regulator
1
$70
PVC pipe and fittings
assorted
$200
bird netting
1 roll
$10
bar grader
2
$300
thermometer
2
$50
field microscope
1
$20
conditioning tanks (300-gallon)
2
$300
aquariums (10-gallon)
25
$200
spawning brushes
25
$92
lumber (hatchery)
assorted
$2,619
used pickup truck
1
$4,000
Supplies
chlorine
5 gallons
$100
broodstock
150
$41
feed (Artemia, broodstock, growout)
-
$85
rubber bands
1 bag
$10
transport bags
4
$16
transport boxes (inner)
40
$140
transport boxes (outer)
40
$100
water test kit
1
$300
misc. chemicals
-
$100
dip nets
-
$100
Total
-
$10,353
Enterprise Budget
In practice, any given species raised on a farm is referred to as an enterprise.
This enterprise will consume and/or share a given amount of farm resources.
In order to estimate the net profits obtained from the production of tiger
barbs, the variable and fixed costs associated with carrying out this specific
activity need to be identified. Once the associated costs are determined,
profit margins can be calculated (see Table 8).
Some assumptions that must be made to understand the enterprise budget
as presented are:
Table 8. Enterprise budget for commercial production of tiger barbs.
Category
Description
1995 Price in US$
Variable Costs
Chemicals
Salt
$10.00
Feed
Artemia, Prepared Feed
$50.00
Repairs
-
$20.00
Transportation
100 miles @ $0.28 per mile
$28.00
Phone/Fax
-
$50.00
Labor
40 hours @ $10 per hour
$400.00
Miscellaneous
$10.00
Total Variable Costs
$568.00
Fixed Costs
Lease
1/20 acre @ $200 per acre
$10.00
Water
1 gallon per minute
@ $0.60 per 1,000 gallons$25.92
Depreciation (Broodstock)
-
$3.38
Depreciation (Tanks)
-
$17.33
Total Fixed Costs
$56.63
Total Fixed and Variable Costs
$624.68
Income
$2,400.00
Net Profit
$1,775.37
It must be understood that the information presented represents tiger barb
production as only one facet of a multi-species ornamental fish farm and
that the production of ornamental fishes is already established. The reader
should also note that during a given month, only 40 hours of labor are
necessary to carry out the production of tiger barbs. Likewise, tiger barbs
are produced at set intervals to result in 10,000 marketable, medium-size
fish per month. As stated previously, the tiger barb reaches a marketable,
medium size approximately three months after hatching.
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Literature Cited
Appendix 1. Preparation of conditioning pastes.
Formula 1 for paste to condition tiger barb broodstock.
Ingredient
Amount
ground beef heart
3 lbs
ground beef liver
3 lbs
raw eggs
4
spinach
6 oz.
peas
6 oz.
carrots
6 oz.
oat bran
4 oz.
multivitamins
24 drops
gelatin (unflavored)
4 packets
Preparation:
Formula 2 for paste to condition tiger barb broodstock.
Ingredient
Amount
ground beef heart
5 lbs
ground beef liver
5 lbs.
high protein baby food (cereal)
2 lbs.
raw wheat germ
2 lbs.
dried split peas
10 oz.
spinach
20 oz.
raw eggs
4
whole shrimp
8 oz.
brewers yeast
4 oz.
Step 1: Trim all the excess fat and any connective tissue
or tendon (stringy material) from the beef heart and liver.
Step 2: Use a food processor or blender to grind or
mash the meat into very small pieces.
Step 3: Mix the remaining ingredients (except for the
gelatin in Formula 1) in a blender or food processor.
Step 4a: In Formula 1, the gelatin acts as a binder
that holds the mixture in a paste. Mix the gelatin in a pot with as little
hot water as necessary to fully dissolve the gelatin. Allow the mixture
to cool slightly but remain fluid, then mix it with the other ingredients.
Pour the mixture into "zip-lock" bags and press them into flat sheets.
The paste should be refrigerated until used or frozen if it will be stored
for long periods.
Step 4b: Formula 2 requires the mixture to be cooked
using a double boiler until the mixture becomes slightly grainy. The mix
is then placed into "ziplock" bags and pressed into sheets for storage.
The mix should be refrigerated until used or frozen for long-term storage.
Variations of these formulas can be tailored to suit nutritional needs
of specific fish and according to available ingredients. The one common
ingredient is high quality protein. Other ingredients, such as spirulina,
can be added at 0.5 percent to 1.0 percent by weight. For fish that are
more herbivorous, the fish meal or red meat components can be reduced and
vegetable protein such as soybean meal can be substituted. Before making
a paste formula, it would be wise to consult the literature to determine
the natural diet of the fish.
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Appendix 2. Hatching of Brine Shrimp (Artemia) and Preparation for
Feeding
Much of the expense of tiger barb fry production involves purchasing Artemia
cysts and subsequent efficiency in hatching the cysts for use in feeding.
The cost has escalated in recent years; the price for a 1-lb. can of Artemia
cysts was $35 to $45 in 1995. Fish fed Artemia exhibit significantly
higher survival rates and elevated weight gains compared to fish given
other feed sources. In addition, fish that do not readily take prepared
feeds almost always will accept Artemia. Several considerations
must be taken into account to optimize use of Artemia nauplii as
a larval feed. These are discussed in the following sections.
Artemia Supplies and Strains
Artemia from various parts of the world differ in size and nutritional
qualities. The two most commonly available Artemia strains are the
strain from Great Salt Lake in Utah strain, which have 486 mm size instar
1 nauplii (first hatch stage), and the San Francisco Bay Brand, which have
slightly smaller, 428 mm nauplii (Sorgeloos et al. 1987). Artemia
also have varying hatch grades; those with higher hatching percentage grades
command a higher price. Commercial supplies of cysts have fallen in recent
times due to harsh winters that have affected the environmental conditions
of cysts, considerably increasing price and availability. When choosing
a source of Artemia, the following should be considered:
Tiger barbs do well on any strain of Artemia, so cost may be the
only factor when choosing an Artemia source.
Hatching Container
Hatching containers can be purchased from a supplier or constructed from
materials such as inverted 5-gallon drinking water containers fitted with
a rubber stopper and plastic valve. The design of the hatching container
is important. It should have a conical shape, smooth inside surface, translucent
and easily drained bottom, and a dark, opaque top. Newly hatched nauplii
are attracted to light (positively phototactic) so using hatching containers
with translucent bottoms aids in harvesting. Examples of hatching containers
being used at the WCC facility are presented in Figure 18.
Cleanliness and Sterilization
The primary reason for poor hatching of Artemia nauplii is lack
of cleanliness. Slime or detritus on the hatching container walls and airline
tubing contributes to significant bacterial interference. Thoroughly cleaning
the parts that are in contact with water during hatching can improve the
consistency and hatching percentage of cysts. To disinfect the hatching
containers, first fill with tap water and add either powdered or liquid
bleach and aerate for 20 to 30 minutes. If powdered bleach (calcium hypochlorite)
is used, add approximately 300 milligrams per 24 liters (0.01 oz per 6
gallons), or use liquid laundry bleach (5.25 percent active and unscented)
at 3.5 milliliters per liter. Be sure to rinse the container thoroughly
with tap water prior to use.
Light
Place a light source, such as a 60-watt bulb, above the container during
the first few hours of rehydration (i.e., when cysts are first placed from
the can into water). Cysts are dehydrated before packing to maintain them
in a dormant state and suspend bacterial growth. Cysts begin to rehydrate
when placed in water, at which time light is needed to stimulate the cysts'
hatching mechanism. The light can be lit over the container during the
entire hatching period. After hatching is completed (14 to 18 hours), the
light over the hatching container is placed underneath the translucent
bottom of the hatching container for harvesting.
Temperature
Generally, Artemia will hatch into the instar I stage nauplii within
14 to 18 hours at temperatures 25°C to 30°C. Lower temperatures lengthen
the hatching time. However, different sources of Artemia have varying
hatch rates and temperature optima. It is important to know when first
hatch occurs so the Artemia can be harvested at the smallest size
possible for easy consumption by the fish larvae. The instar I stage nauplii
have a higher nutritional value in comparison to later developmental stages;
Artemia nauplii can metamorphose into the next developmental stage
(instar I) within several hours. Therefore, timing of the harvest is important
to maximize nutritional value. It is recommended that a constant temperature
be maintained in the hatching containers by the use of heaters to result
in a consistent hatching time that best coincides with larval feeding schedules.
Salinity
The water used for hatching should contain 35 grams rock salt per liter
(approximately 0.3 pounds per gallon) of tap water, or seawater at 35 ppt
salinity can be used. Do not use iodized salt during the hatching process.
Although cysts can be hatched at a lower salinity, maintaining the pH is
more difficult which in turn results in a lower hatching percentage.
Cyst Density and Preparation
Hatching cysts at densities greater than 2 grams per liter of salt water
can cause the pH to decrease, adversely affecting the hatching percentage.
Use no more than 2 grams cysts per liter of salt water. When hatching significant
quantities of cysts, bacteria can interfere and lower hatching percentages.
Bacteria grow on the cysts, decaying their outer shells, and can lower
pH and dissolved oxygen. Disinfecting cysts prior to hatching will lessen
the amount of initial bacteria that cover the cysts. This can be done by
placing the cysts in a chlorinated freshwater solution for 15 to 20 minutes
prior to placing them in salt water. The chlorine solution can be made
by adding 3 grams of 70% active calcium hypochlorite or 40 milligrams of
5.25 percent active sodium hypochlorite or household bleach (unscented)
to 10 liters of tap water. This is suitable to disinfect 500 grams of cysts.
After 20 minutes of disinfecting the cysts, rinse with tap water and place
them into the saline hatching solution for incubation.
pH
A pH above 8.0 should be maintained during hatching of cysts. As mentioned
previously, when hatching large quantities of cysts (e.g., > 2 grams cysts
per liter), the pH of the hatching medium normally decreases. The addition
of 2 grams sodium bicarbonate per liter of salt water used for hatching
will raise the pH to an optimal level for maximal cyst hatching percentages.
Cyst Storage
The hatching percentage of cysts will start to decline within a few months
after the nitrogen-filled container has been opened if it is stored at
room temperature. Once a can of Artemia cysts has been opened, it
should be covered with the plastic lid provided and stored in a refrigerator
at 5°C to 10°C.
Harvesting and Preparation for Feeding
Once Artemia cysts have hatched into the first nauplii stage (instar
I), they should be harvested. Remember that not all cysts hatch at the
same time. To assure harvest of the highest number of nauplii at the right
time, several test runs should be performed and analyzed by recording temperature
and time of hatching. To harvest Artemia nauplii, remove the light
source above the hatching container and illuminate the translucent area
near the bottom of the hatching container, which will attract the nauplii
to the light source and drain valve. Turn off the aeration for approximately
10 minutes. At this time, unhatched cysts and cyst shells will float to
the surface and the hatched nauplii will swim toward the light source.
NOTE: Do not let the nauplii accumulate on the bottom of
the hatching container for more than 10 minutes.
Open the bottom drain valve to pour off any settled debris and discard
it; close the valve once the fluid becomes orange-brown in color. Place
a container to receive the newly hatched brine shrimp under the hatching
container and open the valve slowly. Once the fluid exiting the hatching
container becomes clear, close the valve. The orange-color Artemia
nauplii are then poured into a brine shrimp net or screen with 125-millimeter
to 150-millimeter nylon mesh. Thoroughly rinse the nauplii with tap water
to remove bacteria and hatching metabolites, and place the collected nauplii
into a container filled with fresh salt water, and aerate. Repeat the entire
procedure if a lot of nauplii remain in the hatching container. The Artemianauplii
are now ready to be fed to the fish fry.
Storage of Newly Hatched Artemia
Unused harvested, washed nauplii can be placed back into a container of
fresh saltwater with aeration and kept for future feedings. Artemia
nauplii metamorphose very rapidly, so refrigerating the aerated container
will delay metamorphosis and help keep the nauplii in the instar I stage
and maintain the nutritional value of the nauplii.
Appendix 3. List of suppliers and organizations.
Listing in this appendix does not constitute an endorsement of products
or services but instead recommends products or services that the listed
manufactures, suppliers or organizations may provide. For a more comprehensive
listing, consult your local extension agent or buyers guide directory editions
of one of the industry related publications.
General Aquaculture Products
Seven Oaks Rd., Leland, MS 38756
Phone: (800) 748-8921
Fax: (601) 378-2862
Aeration equipment, water pumps, PVC fittings, filters, nets, water
quality test kits, tanks
33418 Old Saint Joe Rd., Dade City, FL 33525
Phone: (904) 567-8540
Fax: (904) 567-3742
Aeration equipment, water pumps, laboratory equipment, biological filtration,
algal nutrients, inoculant, rotifer starter kits
5252 Lovelock St., San Diego, CA 92110
Phone: (619) 291-8444
Fax: (619) 291-8335
Aeration equipment, water pumps, sterilization equipment, chillers,
heaters, PVC fittings, recirculation systems and components
2056 Apopka Blvd., Apopka , FL 32703
Phone: (407) 886-3939
Fax: (407) 886-6787
Aeration equipment, water pumps, monitors, and controls, recirculation
systems, laboratory equipment, nets, tanks and liners
P.O. Box 13303, Homestead, FL 33090
Phone: (305) 248-4205
Fax: (305) 248-1756
Aeration equipment, valves and test equipment, filtration, disinfection
equipment
4397 Lawehana St., Honolulu, HI 96818-3138
Phone: (808) 423-0028
Fax: (808) 423-0031
Pumps, filters, hoses, electrical supplies
P.O. Box 326, 565 St. Mary St.
Lake Village, AR 71653
Phone: (501) 265-3584
Fax: (501) 265-4146
Pumps, filters, hoses, electrical supplies
Chemical Products
8702 152nd Ave. N.E., Redmond , WA 98052
Phone: (206) 885-3777
Fax: (206) 885-2112
Therapeutics, chemicals, formalin, quinaldine, MS-222, specialty feeds,
laboratory equipment, reference books and manuals
311 Pacific St., Honolulu, HI 96718
Phone: (808) 532-7400
Herbicides, insecticides, fertilizer, agricultural products
P.O. Box 2457, Oxnard, CA 93033
Phone: (805) 486-5319
Fax: (805) 486-2491
Therapeutics, water conditioning products
4331 E. Western Star Blvd., Phoenix, AZ 85044
Phone: (602) 893-9234
Fax: (602) 244-0522
Therapeutics, bacterial cultures, water conditioning products, hormones
(i.e., CPH, HCG, LHRH-A) test kits, meters
Aquaculture Division
P.O. Drawer 17040, Dallas, TX 75217
Phone: (800) 527-1323
Therapeutics, water conditioning products, commercial slime
91-155 C Leowaena St., Waipahu, Hi 96797
Phone: (808) 677-8779
Fertilizer, herbicides, agriculture products
Netting Products
2481 Matthews Ave.
P.O. Box 8331, Memphis, TN 38108
Phone: (800) 238-6380
Fax: (901) 458-1601
Seines, dip nets, gill nets, floats, lead weights, aprons, knives,
rope, baskets, commercial fishing supplies, bird netting
615 East Bodley
P.O. Box 592, Memphis, TN 38101
Phone: (901) 774-1500
Fax: (901) 775-5374
Seines, dip nets, gill nets, floats, lead weights, aprons, knives,
rope, baskets, commercial fishing supplies, bird netting
4800 E. Monument St., Baltimore, MD 21205-3042
Phone: (410) 522-7000
Fax: (410) 522-7015
Plastic netting, tank liners
10503 Cone Grove Rd., Riverview, FL 33569
Phone: (813) 677-7136
Clear plastic fish traps
Water Quality Kits
2363 North King St., Honolulu, Hawaii 96819
Phone: (808) 841-6245
Chemical reagents, test kits, laboratory supplies
P.O. Box 389, Loveland , CO 80539-0389
Phone: (303) 669-3050Z
Fax: (800) 227-4224
Laboratory equipment, chemical reagents, test kits, meters
P.O. Box 329 Rt. 213 N Chestertown , MD 21620
Phone: (800) 344-3100
Fax: (410) 778-6394
Laboratory equipment, chemical reagents, test kits, meters
Tanks and Liners
150 Poopoo Pl., Kailua Kona, HI 96734
Phone: (808) 261-1863
Fax: (808) 262-3828
Concrete holding tanks
11 30 Wilder Ave., Suite 102, Honolulu, HI 96822
Phone: (808) 521-5468
Fiberglass tanks
114- Kekaha Place Honolulu, HI 96825 Phone: (808) 395-5786 Fax: (808)
395-7175 Prefabricated tanks and PVC liners
74-5606-F Pawi Pl., Kailua-Kona, HI 96740
Phone: (808)326-2433
Fax: (808) 329-9170
High Density Polyethylene (HDPE) custom fabricated tanks
Sand Island Access Road
Honolulu, HI 96819
Phone: (808) 847-2339
Fax: (808) 845-4337
Fiberglass tanks
P.O. Box 62015, Honolulu, HI 96822
Phone: (808) 947-3626
Steel circular tanks
P.O. Box 911, Kapaau, HI 96755
Phone: (808) 889-5225
Fax: (808) 889-0200
Permalon tank/pond liners
Fish Graders
2200 Evanston, Dallas, TX 75208
Phone: (214) 748-8824
Fax: (214) 761-9283
Aluminum interchangeable bar graders
198 Freightway St.
P.O. Box 511, Twin Falls, ID 83301
Phone: (208) 733-0503
Fax: (208) 733-0544
Aluminum adjustable bar graders
Feeds
91-319 Ofai St., Kapolei, HI 96707
Phone: (808) 682-0318
Fax: (808) 682-0639
P.O. Box Drawer 17040, Dallas TX 75217-0040
Phone: (214) 285-5471
Fax: (214) 289-8756
Campbell Industrial Park
91-254 Ofai Street, Kapolei, HI 96707
Phone: (808) 682-2022
Checkerboard Square - 11 T, St. Louis, MO 63164
Phone: (314) 982-2402
Fax: (314) 982-1613
115 13th Ave., Buhl, ID 83316-0706
Phone: (208) 543-6421
Fax: (208) 543-4698
41-1521 Lukanela
Waimanalo, HI 96795
Phone: (808) 259-5344
Fax: (808) 259-8034
Feed Additives
4801 W. Peterson, Chicago, IL 60646
Phone: (312) 286-2100
Nutrients, trace elements, vitamin premixes
45 Eisenhower Dr., Paramus, NJ 07652-1429
Phone: (201) 909-5593
Fax: (201) 909-8416
Nutrients, trace elements, vitamin premixes, color enhancing additives
Division of Universal Foods Corp.
433 E. Michigan St., Milwaukee, WI 53202
Phone: (414) 347-3968
Nutrients, trace elements, vitamin premixes, color enhancing additives
Shipping Materials
935 Dillingham Blvd., Honolulu, Hi 96817
Phone: (808) 848-4852
Plastic transport bags
1344 Mookaula, Honolulu, Hi 96817
Phone: (808) 848-1626
Plastic transport bags
91-110 Kaomi Loop Rd., Kapolei, HI 96707
Phone: (808) 682-2038
Styrofoam boxes and styrofoam sheet material, corrugated outer boxes
91-210 Hanua, Wahiawa, Hi 96786
Phone: 808 673-1300
Corrugated foam core boxes
Broodstock
Other listings available from Pet Business Magazine Directory Issue
and Aquaculture Magazine Buyers Guide.
41-653 Poalima St., Waimanalo, HI 96795
Phone: (808) 259-7773
Fax: (808) 259-5029
99670 Kaulainahee Pl., Aiea, Hi 96701
Phone: (808) 488-0716
Fax: (808) 487-7104
10503 Cone Grove Rd., Riverview, FL 33569
Phone: (813)-677-7136
Fish Wholesalers/Distributors -- Hawaii (1996)
National Wholesalers/Distributors are available from the Pet Business
Magazine Directory Issue or Aquaculture Magazine's Buyers Guide:
41-653 Poalima Street, Waimanalo, Hi 96795
Phone: (808) 259-9098
Fax: (808) 259-5029
53-594 Kam Hwy., Punaluu, Hi 96717-9650
Phone: (808) 293-7773
Fax: (808) 293-1962
99-670 Kaulainahee Pl., Aiea, Hi 96701
Phone: (808) 488-0716
Fax: (808) 487-7104
P.O. Box 914, Kaneohe, HI 96744
Phone: (808) 236-2717
Fax: (808) 236-7158
45-512 Luluku Road, Kaneohe, Hi 96744
Phone: (808) 247-6963
Fax: (808) 235-4634
99-899 Iwaena, Unit #103, Aiea, HI 96701
Phone: (808) 484-1144
Fax: (808) 484-1145
85-748 Waianae Valley Rd., Waianae, HI 96792
Phone: (808) 696-4955
P.O. Box 1583, Kaneohe, Hi 96792
Phone: (808) 239-8044
Fax: (808) 239-5014
3577 Pinao St. #13, Honolulu, Hi 96822
Phone: (808) 988-1600
5400 N.W. 84th Ave., Miami, FL 33166
Phone: (305) 592-9890
Fax: (305) 592-9726
P.O. Box 2329, Ashville, NC 28802
Phone: (704) 254-7334