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Partial replacement of fish oil with black soldier fly oil or coconut oil in a low-protein diet effectively spares protein and enhances health status of Pacific white shrimp (Litopenaeus vannamei)

in Journal of Insects as Food and Feed
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J.L. Luo College of Animal Sciences and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P.R. China

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Z.Y. Wang College of Animal Sciences and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P.R. China

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Z.H. Li College of Animal Sciences and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P.R. China

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J.W. Song College of Animal Sciences and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P.R. China

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R.J. Huang College of Animal Sciences and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P.R. China

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H.T. Zhang Key Laboratory of Aquatic, Livestock and Poultry Feed Science and Technology in South China, Ministry of Agriculture and Rural Affairs, Guangdong Evergreen Feed Industry Co., Ltd., Zhanjiang, 524000, China

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L.S. Wang Key Laboratory of Aquatic, Livestock and Poultry Feed Science and Technology in South China, Ministry of Agriculture and Rural Affairs, Guangdong Evergreen Feed Industry Co., Ltd., Zhanjiang, 524000, China

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https://orcid.org/0000-0003-0981-4740
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Y.H. Huang College of Animal Sciences and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P.R. China

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B.P. Tan College of Fisheries, Guangdong Ocean University, Zhanjiang, Guangdong Province 524088, P.R. China

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M. Zhou College of Animal Sciences and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, Guangdong 510225, P.R. China

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https://orcid.org/0000-0002-7582-6785
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Abstract

Black soldier fly oil (BSFO), as well as coconut oil (CCO), naturally enriched in medium-chain fatty acids (MCFAs), are demonstrated to play roles in modulating energy metabolism and improving physiological health in cultured animals. This study was conducted to investigate the feasibility of BSFO and CCO application in diets for Pacific white shrimp (Litopenaeus vannamei), focusing on their protein-sparing and health-promoting effects. Six experimental diets were formulated: a higher-protein (42% protein, HP) diet, a lower-protein (40% protein, LP) diet, and four LP diets with fish oil partially replaced by 1% or 2% BSFO (LP-BSFO1, LP-BSFO2) or CCO (LP-CCO1, LP-CCO2). Following an 8-week feeding trial, shrimp fed the LP diet showed a significantly lower weight gain rate (298.27%) and a higher feed conversion ratio (2.03) than those fed the HP diet (336.54% and 1.66, respectively). However, the inclusion of BSFO or CCO in the LP diet notably compensated for the impaired growth performance, fully restoring it to a level comparable with the HP group. Similarly, compared to the LP group, BSFO or CCO inclusion effectively improved apparent digestibility for protein, lipid, phosphorus and calcium, modulated serum biochemical profiles (including parameters related to protein synthesis, glucolipid metabolism, and hepatic function), enhanced intestinal health (enhanced villus morphology and reduced Vibrio abundance) and hepatic energy metabolism (via regulation of key lipid and energy metabolism genes). Under hypoxic stress, shrimp in the BSFO and CCO groups exhibited higher survival rates (60.0–73.3%) than those in the HP group (53.3%). In conclusion, BSFO and CCO can be effectively incorporated into low-protein diets for L. vannamei to spare dietary protein and enhance health, by improving nutrient digestibility, optimizing energy metabolism, and reinforcing intestinal and hepatopancreatic function.

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