Specific importance of low level dietary supplementation of <i>Lypomyces starkeyi CB1807</i> yeast strain in red sea bream (<i>Pagrus major</i>)

Abstract Most probiotic yeast supplement in fish exhibit beneficial effect at ≤1% of the dietary proportion. This study aimed evaluating specific effects Lypomyces starkeyi CB180 7 strain supplemented proportion on performance juvenile red sea bream ( Pagrus major , 1.9 ± 0.04 g). Five diets were with graded levels 0% (control diet ‘CD1’), 0.05% (D2), 0.1% (D3), 0.5% (D4), and 1.0% (D5). After 45 days feeding trial, significant (P&lt;0.05) improvement was detected final body weight (FBW) gain (BWG) fed D3 D5 compared to control. Low values total cholesterol (T-Cho) aspartate aminotransferase (AST) recorded groups D2, D4, D5, respectively. Fish D3, D4 showed high P &lt;0.05) serum, mucus liver lysozyme immunoglobulin (Ig) D2 strong correlation biological antioxidant activity (BAP), superoxide dismutase (SOD) catalase (CAT). The potential (BAP) significantly higher control (P&lt;0.05). reactive oxygen metabolites (d-ROM) lower CD1 Peroxidase improved tolerance ability (LT 50 ) against low salinity stress It concluded that benefits spent L. considerable capacity bream, P. .