What question did this study set out to answer?

The aim is to evaluate if compound protein sources can replace fish meal effectively in juvenile Japanese seabass diets.

April 24, 2026

Effects of fish meal replacement with compound protein source on growth performance and body composition of juvenile Japanese Seabass Lateolabrax japonicus

Puntos clave

The aim is to evaluate if compound protein sources can replace fish meal effectively in juvenile Japanese seabass diets.
Formulated a compound protein source from soybean meal, meat and bone meal, peanut meal, and rapeseed meal.
Prepared six isoenergetic diets with varying levels of fish meal replacement (0-65%).
Reared juvenile Japanese seabass in triplicate cages for 8 weeks and assessed growth after a fasting period.
Replacement levels of 39%, 52%, and 65% showed significantly lower weight gain, specific growth rate, and feed efficiency.
CPS supplementation led to decreased whole-body crude protein and lipid content.
The CPS level notably affected whole-body lysine and methionine levels.

Resumen

Abstract Objective To evaluate compound protein sources (CPSs) as a sustainable alternative to fish meal in diets for juvenile Japanese Seabass Lateolabrax japonicus, assessing impacts on growth performance and body composition. Methods A dietary CPS was formulated by blending soybean meal, meat and bone meal, peanut meal, and rapeseed meal (4:3:2:1 ratio), supplemented with crystalline L-methionine (0.77%), L-lysine (0.95%), and L-isoleucine (0.44%). Six isoenergetic diets with graded fish meal replacement (0, 13, 26, 39, 52, 65%) were prepared. Juvenile Japanese Seabass (n = 180 per group, initial weight 6.26 ± 0.10 g) were reared in triplicate sea cages per diet and fed for 8 weeks. After 24-h fasting, fish were bulk-weighed per cage. Subsequently, 20 fish per replicate were euthanized with MS-222 (100 mg/L) and stored at −20°C for whole-body composition analysis. Results The findings demonstrated that the replacement levels of 39, 52, and 65% were considerably lower than those of the other three groups (P 0.05) in terms of weight gain, specific growth rate, and feed efficiency. Dietary CPS supplementation resulted in a decrease in whole-body crude protein and crude lipid and gross energy contents. The dietary CPS level had a substantial impact on whole-body lysine and methionine levels (P 0.05), while other essential amino acid contents did not differ significantly. Conclusions A dietary CPS effectively replaces up to 26% of dietary fish meal without compromising production metrics, providing a viable strategy to enhance aquaculture sustainability.

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