Biological Aspects
White snapper are Euryhaline and Katadromus live in tropical waters and the West subtropik Indopasifik. Male fish that have reached 2-2,5 kg weight can be changed sex to female (Protandry Hermaprodite).
Hatchery Technology
1. Procurement and Maintenance Up
Main candidates can be obtained from the catch in the wild or in captivity results. To accelerate the ripening sex, prospective parents maintained at sea by using floating nets, the density of 1 fish per 1-2 menter per cubic water.
Rucah feed of fresh fish is given 1 time a day with a fixed time schedule. Dose feed 5% of total body weight per day, later reduced to 1-3% at the time of the season arrived pijah.
Means of controlling the physical conditions of routine maintenance carried out every day, once a month net reimbursement for Preventing the escape of fish, reduce Fauling Organisms and menciptakn comfortable atmosphere and experience.
2. Parent Selection
The criteria for a good parent dipijahkan:
• Parent bright gray healthy
• Active Movement
• Fin and parenthesis complete and not defective
• colored eyes clear
• Age at least 3 years with weight 2-5 kg / fish
• The size of cultivated balanced
Gonadal maturation level checks can be done by stripping or kanulasi of fish that have been dipingsankan with Ethylineglicol monophenil ether 200 ppm. Dipijahkan ready Oocyst diameter 0,4-0,5 mm.
3. Spawning
Done by hormone induces LH - RH a male and the female parent are Intramuscular options below dorsal fins. Injections done once (10:00 AM) at a dose of 0.05 mg per kg of total weight of fish.
Sex ratio 1:1 spawning, the fish will normally memijah at night (± 32 hours after the injection of hormones).
4. Harvesting and hatching eggs
Eggs that had just harvested were selected, and then transferred into the tub with the density of eggs hatching 50-100 grains / liter of water. The incubation period ± 18 hours, and the newly hatched larvae have a total length of 1.60 ± 0.04 mm.
5. Larvae and Seed Rearing
Bath maintenance larvae are equipped with drainage pipes and water revenues, and the aeration unit to supply oxygen. In summary schedule of operational activities pemebrian feed, water replacement media and seed spacing tebar solid until the age of 30 days can be seen in the following appendix.
Maintenance efficiency
Every pound of weight of the parent can produce eggs about 0,6-0,76 million eggs. When normal conditions hatching rate reaches 85%. Larvae kelulushidupan level at 15 days (70-80%) and at the age of 30 days (30-50%).
In one year can be 8 times of spawning, where each time the production takes approximately 40 days, with 5000 ekor/m3 seed production, age 30 days.
White snapper are Euryhaline and Katadromus live in tropical waters and the West subtropik Indopasifik. Male fish that have reached 2-2,5 kg weight can be changed sex to female (Protandry Hermaprodite).
Hatchery Technology
1. Procurement and Maintenance Up
Main candidates can be obtained from the catch in the wild or in captivity results. To accelerate the ripening sex, prospective parents maintained at sea by using floating nets, the density of 1 fish per 1-2 menter per cubic water.
Rucah feed of fresh fish is given 1 time a day with a fixed time schedule. Dose feed 5% of total body weight per day, later reduced to 1-3% at the time of the season arrived pijah.
Means of controlling the physical conditions of routine maintenance carried out every day, once a month net reimbursement for Preventing the escape of fish, reduce Fauling Organisms and menciptakn comfortable atmosphere and experience.
2. Parent Selection
The criteria for a good parent dipijahkan:
• Parent bright gray healthy
• Active Movement
• Fin and parenthesis complete and not defective
• colored eyes clear
• Age at least 3 years with weight 2-5 kg / fish
• The size of cultivated balanced
Gonadal maturation level checks can be done by stripping or kanulasi of fish that have been dipingsankan with Ethylineglicol monophenil ether 200 ppm. Dipijahkan ready Oocyst diameter 0,4-0,5 mm.
3. Spawning
Done by hormone induces LH - RH a male and the female parent are Intramuscular options below dorsal fins. Injections done once (10:00 AM) at a dose of 0.05 mg per kg of total weight of fish.
Sex ratio 1:1 spawning, the fish will normally memijah at night (± 32 hours after the injection of hormones).
4. Harvesting and hatching eggs
Eggs that had just harvested were selected, and then transferred into the tub with the density of eggs hatching 50-100 grains / liter of water. The incubation period ± 18 hours, and the newly hatched larvae have a total length of 1.60 ± 0.04 mm.
5. Larvae and Seed Rearing
Bath maintenance larvae are equipped with drainage pipes and water revenues, and the aeration unit to supply oxygen. In summary schedule of operational activities pemebrian feed, water replacement media and seed spacing tebar solid until the age of 30 days can be seen in the following appendix.
Maintenance efficiency
Every pound of weight of the parent can produce eggs about 0,6-0,76 million eggs. When normal conditions hatching rate reaches 85%. Larvae kelulushidupan level at 15 days (70-80%) and at the age of 30 days (30-50%).
In one year can be 8 times of spawning, where each time the production takes approximately 40 days, with 5000 ekor/m3 seed production, age 30 days.
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