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Evaluation of dietary soybean meal as fish meal replacer for juvenile whiteleg shrimp, Litopenaeus vannamei reared in biofloc system

Yun, Hyeonho, Shahkar, Erfan, Hamidoghli, Ali, Lee, Seunghan, Won, Seonghun, Bai, Sungchul C.
International aquatic research 2017 v.9 no.1 pp. 11-24
Litopenaeus vannamei, biofloc technology, cholesterol, enzyme activity, experimental diets, fish meal, hemolymph, juveniles, lysine, methionine, nitrates, protein content, rearing, seawater, shrimp, soybean meal, specific growth rate, superoxide dismutase, triacylglycerols, water quality analysis, weight gain
Different levels of dietary soybean meal (SBM) as a fish meal (FM) replacer, with and without amino acid supplementation, for whiteleg shrimp, Litopenaeus vannamei reared in the biofloc system was examined in eight weeks of feeding trial. Eight experimental diets consisted of a basal diet with 0% FM replacement by SBM provided in clear sea water without biofloc system (S₀SW), four diets replacing FM at 0% (S₀), 33% (S₃₃), 67% (S₆₇) and 100% (S₁₀₀) by SBM, and three diets replacing FM at 33% (S₃₃A), 67% (S₆₇A) and 100% (S₁₀₀A) by SBM supplemented with amino acids (methionine and lysine) in the seawater biofloc system. Results of water quality analyses showed significantly lower total suspended solids and nitrate for S₀SW group than all other treatments. Diets S₀ and S₃₃A resulted in higher weight gain and specific growth rate among all groups, with no significant differences with S₃₃ group. In addition, whole-body protein and amino acid compositions of shrimp fed S₀SW were lower than most biofloc groups. Haemolymph parameters showed significant differences in total protein, cholesterol and triglyceride between groups S₀ and S₀SW. Also, superoxide dismutase activity showed a decreasing trend with increasing replacement level. In conclusion, based on these results, SBM could replace up to 33% of FM with or without amino acid supplementation in juvenile whiteleg shrimp diets reared in the biofloc system.