抄録
This study was carried out to investigate the relationship between the composition of broodstock diets and the chemical components of eggs and larvae produced. Two groups of striped jack were used to investigate the effect of two diets, a raw fish mix diet (RF) and a commercial soft-dry pellet diet (cSDP).
Proximate composition of the diets showed the RF diet to be a protein rich diet and the cSDP diet to be a high energy diet on a dry matter basis. Lipids, polar and non-polar lipids, fatty acids, vitamin E, and carotenoid contents were analyzed for buoyant eggs and subsequent larvae produced.
Eggs and larvae obtained throughout the spawning period showed fatty acid patterns typical of marine eggs and larvae. Broodstock fed on cSDP produced eggs and larvae with a higher eicosapentaenoic acid (EPA) content and a lower docosahexaenoic acid (DHA) content than those produced from the RF group. The percentage of non-polar lipids in eggs obtained from the cSDP group was slightly higher, and vitamin E contents were similar. Although both diets contained carotenoids, no carotenoids were detected in any of the eggs or larvae sampled.
Total lipids, fatty acid profiles, and lipid classes of the eggs produced were related to their availability in the diets, indicating the importance of pre-spawning nutritional regimes for striped jack.
