SEA BASS (Lates calcarifer) BROODSTOCK NUTRITION AND EFFECTS ON THE QUALITY OF EGG

The effects of broodstock nutrition on spawning performance of farmed seabass based on current nutritional practiced was monitored. Seabass broodstock was fed with fresh fish as first feeding trial for spawning performances in six months. They were spawned naturally every month and a total of 88.70 million eggs was collected with average 80% of fertilization rate. The quality of eggs produced is moderate; whereas the eggs diameter was decreased from 905.18 µm to average sizes 711.23 µm. The second feeding trial then was introduced by using fresh fish and broodstock diet (pelleted) and the spawning performances was monitored for the next six months. They were spawned naturally every month and a total of 83.33 million eggs was collected with average 80% of fertilization rate. The quality of eggs produced is no significant different compared to broodstock fed with fresh fish. Even though the eggs diameter was slightly increased to average sizes 733.58 µm but it's still consider smaller compared to most evaluating good egg size which is above 800 µm. In the year 2015, third feeding trials was introduced by using fresh fish and bio-omega (omega 3; DHA & EPA + vitamin E). The egg produced was show significant results with the fertilization rate increased and the egg diameter produced bigger in size. The used  mixed diet of bio-omega containing omega-3; docosahexaenoic and eicosapentaenoic acid (DHA and EPA) and vitamin E enriched in sea bass feed was enhanced the egg diameter with the average size 830 µm (á14.8%);  and fertilization rate up to 90% (á10%). The total of 121.49 million fertilised egg were produced until December 2015.