The Substitution of Soybean Lecithin With Lysophospholipids Promoted the Growth Performance, Lipid Metabolism, and Reduced Dietary Lipid Inclusion for Pacific White Shrimp ( Litopenaeus vannamei )

This study evaluated the feasibility of replacing soybean lecithin (SBL) with lysophospholipids (LYLs) in the diet of Pacific white shrimp, Litopenaeus vannamei . Five isonitrogenous diets were formulated as the control diet with 15 g/kg soybean oil and 15 g/kg SBL inclusion (LYL‐0), three SBL‐substituted diets with 1/3, 2/3, and 3/3 of SBL substituted with the same amounts of LYL (LYL‐0.5, LYL‐1, and LYL‐1.5), and a low‐lipid diet (LYL‐L) with 5 g/kg soybean oil and 15 g/kg LYL inclusion. Then, shrimp (1.6 ± 0.1 g) were fed with the above diets for 8 weeks. The LYL‐1.5 group presented significantly higher weight gain (WG) than the control ( p < 0.05), but no significant difference was observed in WG and feed conversion ratio (FCR) between the control and LYL‐L group, or between the LYL‐L and LYL‐1.5 group ( p > 0.05). Whole‐body lipid levels were found to be substantially increased in the LYL‐1 and LYL‐1.5 groups compared to the control, while hepatopancreatic lipid content and lipid droplet area (Oil Red O stain) were significantly lower in the LYL‐1, LYL‐1.5, and LYL‐L groups ( p < 0.05). Serum high‐density lipoprotein cholesterol (HDL‐C), lipoprotein lipase (LPL), hepatic lipase activities, and the apparent digestibility of crude lipid were significantly increased in the LYL‐1 and LYL‐1.5 groups ( p < 0.05). In contrast, serum triglyceride (TG) and total cholesterol (TC) levels were significantly decreased in the LYL‐1.5 and LYL‐L groups ( p < 0.05). In summary, under the present conditions, the complete replacement of SBL with LYLs improved growth performance and lipid metabolism and enabled a 10 g/kg reduction in dietary lipid level for Pacific white shrimp.