Effect of Lipid Levels on the Growth Performance and Hepatic Lipid Deposition in the Post-Larval Coho Salmon (Oncorhynchus kisutch)

In this study, the effect of different lipid levels (6.6, 10.56, 15.43, 18.91, 22.52 and 26.91%) on the body composition, growth performance and lipid deposition was investigated in the post-larval coho salmon (Oncorhynchus kisutch). The results showed that the optimum lipid level for post-larval coho salmon was 15.8% based on the Specific Growth Ratio (SGR). Moreover, 15.43, 18.91, 22.52 and 26.91% lipid levels significantly elevated the content of crude lipid in fish. However, the moisture, ash and crude protein was not significantly influenced by various lipid levels. The lipid levels of 18.91, 22.52 and 26.91% significantly elevated the content of TC, TG and NEFA, whereas significantly decreased the activity of FAS, ACC and ACL in the liver of coho salmon. In addition, the higher lipid levels significantly increased the activity of HL and LPL in liver. The total content of Saturated Fatty Acids (SFA) was increased but that of Polyunsaturated Fatty Acids (PUFA) was decreased by 18.91, 22.52 and 26.91% lipid levels. In all, the appropriate lipid levels had positive effects on the growth performance and hepatic lipid deposition of the post-larval coho salmon. Our results will be beneficial for optimizing the use of lipid in the diets of Coho salmon.