The objective of this study was to evaluate the quality of golden trevally larvae through the appropriate density and type of commercial feed at the stage of feed conversion. The experiments on the effect of density and type of commercial feed on the quality of golden trevally during the feed conversion period were conducted in six experimental treatments with a combination of three types of feed (B1, 2/3, Cavias). at two densities (210 and 420 fish/tank). Each treatment was repeated three times for a total of 18 experimental units. Larval quality such as growth, survival rate, respiratory rate and salinity shock were evaluated after four weeks. The results showed that the growth and survival rate decreased gradually, but the respiratory rate and mortality increased with each type of food such as B1, 2/3 and Cavias, respectively. Golden trevally larvae cultured at density of 210 fish/tank had greater growth and survival rate than fish cultured at density of 420 fish/tank. In conclusion, the combination of feed type and density showed that the density of 210 fish/tank with feed type of B1 gave the best larval quality in the present study.
Keywords: Golden trevally, Gnathanodon speciosus, feed, density.