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The optimal dietary protein level of juvenile silver sillago Sillago sihama at three dietary lipid levels
Author(s) -
Huang Qin-Cheng,
Qin DiGen,
Tan BeiPing,
Du Tao,
Yang Yuan-Zhi,
Yang Qi-hui,
Chi ShuYan,
Dong Xiao-hui
Publication year - 2020
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.14431
Subject(s) - biology , feed conversion ratio , zoology , lipase , malondialdehyde , antioxidant , juvenile , factorial experiment , food science , superoxide dismutase , protein efficiency ratio , biochemistry , body weight , endocrinology , enzyme , ecology , statistics , mathematics
A 5 × 3 factorial growth trial was conducted to evaluate optimal dietary protein and lipid levels (dietary protein level, DP; dietary lipid level, DL) for juvenile Sillago sihama ( S . sihama ) (2.0 ± 0.02 g, initial weight). Fish were fed 15 diets containing 5 DPs (350, 400, 450, 500 and 550 g/kg) and 3 DLs (60, 90 and 120 g/kg) for 8 weeks. The interaction between proteins and lipids significantly influenced the feed conversion ratio, condition factor, body composition, antioxidant indices and lipase activity ( p < .05). DP 450 g/kg showed the highest average final body weight. DPs 500 and 550 g/kg significantly decreased the protein efficiency ratio ( p < .05). DL 120 g/kg showed the highest percentage weight gain. The low feed conversion ratio was found in diets P45L12, P55L9 and P55L12. Diet P45L12 showed high superoxide dismutase activities. DP 450 g/kg showed the lowest average malondialdehyde content. Lipase activity was increased by increasing DP ( p < .05) with a fall at DP 550 g/kg. Under the present experimental conditions, the optimal DP for S . sihama was 450 g/kg under the DL 120 g/kg.