THE HATCHERY TECHNOLOGY OF GOLDEN TREVALLY FISH (Gnathanodon speciosus Forsskal) FOR THE SUSTAINABLE DEVELOPMENT OF THE AQUACULTURE IN THE INDONESIAN
The golden trevally, G. speciosus, Forsskall is well-known as kue fish, belonging to the family of Carangidae, lived at the shallow sea water surface and coral reefs, swift swimmer, has oval, and flat body. It has high economical value with high price as exported commodity. This species can be used as a marine ornamental fish, with the commercial name in Indonesian of pidana kuning,simba kuning or ikan kue. The purpose of the present study was to know the management of technology spawn and gonad maturations and seed production of fish fry golden trevally in the control tank. The breeder rear on were conducted using two concrete tanks and fiber glass which have volumes of 30 m3 for larvae rearing of 6 m3. The size of breeder around 1.5-3.0 kg. The result of the experiment showed that fish in treatment A gave better best results of natural reproduction, and spawning on one year total number of eggs 11.450.000 pc and time spawning 156 times, and 48 times total number of eggs 3.240.000 pc for B (control). The hatching rate of eggs between 35,0-95,0 % with SAI around 2.25-4.80 for A treatment, and B treatment hatching rate of eggs between 20,0-92,0 % and SAI 2.00-4.20. The spawning season during one year, were on full moon and new moon. The larvae rearing survival rate have 5.8-8.20% during 28-30 days, and for nursery size to 5-8 cm have survival 60-70% during 20-30 day old.
The result of the experiment showed that fish in treatment A gave better best results of natural reproduction, and spawning on one year total number of eggs 11.450.000 pc and time spawning 156 times, and 48 times total number of eggs 3.240.000 pc for B (control). The hatching rate of eggs between 35,0-95,0 % with SAI around 2.25-4.80 for A treatment, and B treatment hatching rate of eggs between 20,0-92,0 % and SAI 2.00-4.20. The spawning season during one year, were on full moon and new moon. The larvae rearing survival rate have 5.8-8.20% during 28-30 days, and for nursery size to 5-8 cm have survival 60-70% during 20-30 day old.