Abstract
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.
Highlights
As one of main components of fish diets, lipid is a key energy substance for the growth of fish species
The results showed that the optimum lipid level was 15.8% based on Specific Growth Ratio (SGR) analysis (Fig. 2)
Our results showed that the optimum lipid level was 15.8% based on SGR and the appropriate lipid level had positive effect on the growth performance of Coho salmon
Summary
As one of main components of fish diets, lipid is a key energy substance for the growth of fish species. It is found that the appropriate lipid levels in diets are beneficial for fish growth. The insufficient supply of dietary lipids will lead to the deficiency of the essential fatty acids and affect fish growth. With the increasing usage of high-fat diets in the fish aquaculture, the negative effects of excessive dietary lipids has been observed in some fish species (Gou et al, 2019; Hua et al, 2019; López et al, 2006). The high dietary lipid levels affect the absorption and utilization of nutrients, and lead to the abnormal hepatic or visceral lipid deposition in fish species (Cai et al, 2017; Paulino et al, 2020). The significant differences on the nutrients demand have been observed in the different growth stages of fish species
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