Fatty Acid and Free Amino Acid Composition of Muscles and Gonads from Wild and Captive Tilapia Oreochromis niloticus (L.) (Teleostei: Perciformes): An Approach to Development Broodstock Diets

摘要

The fatty acid and free amino acid s compositions in muscles and gonads between wild and captive Nile tilapia Oreochromis niloticus (L.) (Teleostei: perciformes) broodstocks were compared to propose some guidelines of the fatty acid and amino acid requirements for developing specific diets of the broodstock. The total levels of 3 and 6 fatty acid s were generally higher in polar lipids than in neutral lipids for all broodstock samples. In polar lipid, total 3 fatty acid levels in wild broodstock was higher than that in captive fish, while an opposite trend was observed for -6 fatty acid . The results on captive broodstock showed that Linoleic Acid (LA) levels in muscle and gonads were higher compared to wild fish, especially in polar lipid. The LA level was higher than linolenic acid (LAN) level, irrespective of the lipid type and the tissue. Arachidonic acid (20: 46, ARA) level in gonads and muscle, were higher in captive broodstock than the wild. All Essential Amino Acids (EAA) and most Non-Essential Amino Acids (NEAA) in ovaries were significantly higher (0.05) in wild fish than captive broodstock. Taurine and hydroxylproline recorded the significant higher (0.05) levels in captive broodstock than that in wild fish. In conclusion, LA and LAN level and the ratio should be considered when formulated diets for tilapia broodstocks are designed.