The objective of this study was to evaluate the feeding ability and oxygen consumption of larvae of golden trevally Gnathanodon speciosus at different ages. Experiments were determined at the age of 10, 13, 16, 19 days after hatching. Each day of age was collected 60 fish at the three different tanks (30 fish for determining the feeding ability, 30 fish remain for determining the amount of oxygen consumption). Feeding ability was determined by the ability to capture Artemia during 5 minutes. The oxygen consumption of fish larvae was determined by closed bottle for 10 minutes. Experimental results showed that the feeding ability and the amount of oxygen consumption changed via different ages. The feeding ability of fish larvae increased with age (10, 13, 16, 19 days) as (0.8333, 1,0000, 1,556, 2,000 Artemia/individual/5 min), respectively. Meanwhile, the oxygen consumption of fish larvae also increases with age. Therefore, it is advisable to increase the amount of food and oxygen content for good growth of larvae following the age of golden trevally larvae.
Keywords: Golden trevally, Gnathanodon speciosus, feeding ability, oxygen consumption.