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

• Published in: Aquaculture International
• Main Authors: Zhang, Yuanyuan, Fan, Ze, Wu, Di, Li, Jinnan, Xu, Qiyou, Liu, Hongbai, Wang, Liansheng
• Other Authors: Agriculture Research System of China, Central Public-interest Scientific Institution Basal Research Fund, Chinese Academy of Fishery Sciences, the National Key R & D Program of China, the Financial Assistance from Postdoctoral Scientific Research Developmental Fund of Heilongjiang Province
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2021
• Subjects: Agronomy and Crop Science; Aquatic Science; Acipenser baerii
• Online Access: http://dx.doi.org/10.1007/s10499-021-00712-7; https://link.springer.com/content/pdf/10.1007/s10499-021-00712-7.pdf; https://link.springer.com/article/10.1007/s10499-021-00712-7/fulltext.html

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