Ontogeny Changes in Fatty Acid and Amino Acid Profiles in Yellowfin Seabream (Acanthopagrus latus) Eggs and Larvae

3 Abstract: This study was aimed to gain knowledge on ontogeny of fatty acid and amino acid profiles in Acanthopagrus latus larvae. The samples were collected randomly in triplicate at 5 stages. The samples for biochemical analyses were taken for the first stage (stage 1) before placing the eggs in the hatching buckets. After hatching, sampling was made every 24 hours as follows: at 0 time (stage 2), 24 (stage 3), 48 (stage 4) th th and 72 (stage 5) hours. Fatty acid results showed that the eggs and yolk sac larvae contain more th monounsaturated and polyunsaturated fatty acids than saturated fatty acids. Among polyunsaturated fatty acids, linoleic acid (C18:2n-6), linolenic acid (C18:3n-3) and arachidonic acid (C20:4n-6) increased during development, but docosahexaenoic acid (C22: 6n-3) and eicosapentaenoic acid (C20:5n-3) decreased from stage 2 to stage 5. The changes observed in amino acid contents of the fertilized egg and yolk sac larvae were significantly different (P<0.05). The amounts of essential amino acids and nonessential amino acids decreased during development with the exception of phenylalanine, methionine, glutamic acid and serine (P<0.05). In conclusion, our results can give essential information for a better understanding of nutritional requirements at the start of exogenous feeding.