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Effects of silkworm pupae powder on growth performance, muscle fatty acid composition, and intestinal function in mandarin fish (Siniperca chuatsi)

Year: 2024

Type: article

Abstract: This study examined the effects of dietary silkworm pupae powder (SWP) supplementation on the growth performance, muscle fatty acid composition, and intestinal function in mandarin fish ( Siniperca chuatsi ) during a 60-day feeding trial. A total of 360 fish (initial body weight 52.44 ± 0.06 g) were distributed randomly into three groups with three replicates per group and 40 fish per replicate. The three groups were fed either the basal diet, supplementation with 1.0 % fermented SWP (T1), or supplementation with 1.0 % fermented induced SWP (T2, induced by Beauveria bassiana ). Results showed that fish fed T1 had significantly higher ( P < 0.05) condition factor, C16:0, C20:4n-6, C20:5 n3, C22:6n3 C22:5n6, C22:5n-3, and n-3/n-6 levels, but lower ( P < 0.05) fat body ratio, C18:1, C18:2n-6 and crude lipid levels than those fish fed basal diet. All fish had similar ( P > 0.05) weight gain rate, specific growth rate, feed conversion rate, feed intake, and hepatosomatic index. Fish fed T2 had higher ( P < 0.05) trypsin activity than those fish fed basal diet. Compared with the basal diet, fish fed T1 or T2 had higher ( P < 0.05) villus length, muscular layer thickness, glutathione peroxidase, alkaline phosphatase, and lysozyme activities, but lower ( P < 0.05) triglyceride and total cholesterol levels. Comparative transcriptomic analysis indicated that T1 or T2 enhanced immunity and lipid metabolism ability, as manifested in the up-regulated expression of il12rb1 , scdb , tlr2, and FABP7 , and the down-regulated expression of EBP and hsd17b7 . These findings suggest that dietary supplementation with fermented SWP could enhance the health and quality of mandarin fish, potentially offering a valuable strategy for improving aquaculture productivity. • Effects of silkworm pupae powder (SWP) on growth, muscle quality, and intestinal function of mandarin fish were evaluated. • Dietary SWP did not affect growth but improved the immunity of mandarin fish. • Dietary SWP promoted lipid metabolism of mandarin fish.

Source: Aquaculture Reports

DOI: 10.1016/j.aqrep.2024.102435