Dietary magnesium requirement on dietary minerals and physiological function of juvenile hybrid sturgeon (Acipenser schrenckii♀ × Acipenser baerii♂)

Abstract Sturgeons are an economically important freshwater aquacultural fish in China and elsewhere. Research was conducted to study the magnesium requirement of juvenile hybrid sturgeon ( Acipenser schrenckii ♀ × baerii ♂) based on mineral composition, proximate chemical analysis, antioxidant enzyme levels, growth metrics. Different levels supplements (43.2, 157.3, 326.5, 549.6, 743.9, 938.4, 1118.2 mg kg −1 ) were fed for 8 weeks. Five hundred twenty-five sturgeons (an average initial body weight 7.65 g) randomly divided into 7 groups with 3 replicates each (25 per replicate, tanks 100×50×50 cm, dissolved oxygen ≥ 5.0 L , 12 light:12 dark) 4 times day experimental diets containing 40.78% crude protein 10.03% fat. The tissues blood then sampled analyzed. Growth performance not significantly different between treatments P> 0.05). optimal dietary estimated be 355.16, 573.6, or 584.6 whole-body Mg retention, vertebrae content versus levels. calcium phosphorus ratio 43.2 326.5 higher than that 938.4 group P < A concentration 350–700 improved capacity by decreasing serum malondialdehyde enhancing superoxide dismutase, glutathione peroxidase, catalase activities.