Kaiser Frederik, Schlachter Michael, Schulz Carsten, Figueiredo-Silva Claudia
Institute of Animal Breeding and Husbandry, Department of Marine Aquaculture, Christian-Albrechts-University Kiel, Olshausenstraße 40, 24098 Kiel, Germany.
Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering, Aquaculture und Aquatic Resources, Hafentörn 3, 25761 Büsum, Germany.
Aquac Nutr. 2023 Jan 24;2023:7092657. doi: 10.1155/2023/7092657. eCollection 2023.
Sustainable aqua feeds have become an urgent necessity for future-oriented aquaculture sector development, and especially mineral supply could be limited when diets are being prepared with low amounts of animal-based sources. Since knowledge about the efficiency of organic trace mineral supplementation in different species of fish is limited, the effects of chromium DL-methionine in African catfish nutrition were evaluated. Four commercially based diets with increasing chromium DL-methionine supplementation (0, 0.2, 0.4, and 0.6 mg Cr kg) in the form of Availa-Cr 1000 were fed to African catfish ( B., 1822) in quadruplicate groups for 84 days. Growth performance parameters (final body weight, feed conversion ratio, specific growth rate, daily feed intake, protein efficiency ratio, and protein retention efficiency), biometric indices (mortality, hepatosomatic index, spleen somatic index, and hematocrit), and mineral retention efficiency were assessed at the end of the feeding trial. The specific growth rate was significantly increased in fish-fed diets with 0.2 mg Cr kg and 0.4 mg Cr kg supplementation in comparison with control and based on the second-degree polynomial regression analysis; supplementation with 0.33 mg Cr kg was optimal in commercially based diets for African catfish. Chromium retention efficiency was reduced with increasing supplementation levels; however, the chromium content of the whole body was comparable to literature. The results suggest that organic chromium supplementation is a viable and safe supplement for diets to increase the growth performance of African catfish.
可持续水产饲料已成为面向未来的水产养殖部门发展的迫切需求，尤其是在使用少量动物源性原料制备饲料时，矿物质供应可能会受到限制。由于关于不同鱼类品种中有机微量矿物质补充剂效率的知识有限，因此评估了DL-蛋氨酸铬在非洲鲶鱼营养中的作用。以Availa-Cr 1000的形式，向非洲鲶鱼（B., 1822）投喂四种商业饲料，其DL-蛋氨酸铬补充量递增（0、0.2、0.4和0.6毫克铬/千克），每组重复四次，为期84天。在饲养试验结束时，评估生长性能参数（终末体重、饲料转化率、特定生长率、日采食量、蛋白质效率比和蛋白质保留效率）、生物计量指标（死亡率、肝体指数、脾体指数和血细胞比容）以及矿物质保留效率。与对照组相比，投喂补充0.2毫克铬/千克和0.4毫克铬/千克饲料的鱼类特定生长率显著提高，基于二次多项式回归分析，在非洲鲶鱼的商业饲料中，补充0.33毫克铬/千克是最佳的。随着补充水平的提高，铬保留效率降低；然而，鱼体的铬含量与文献报道相当。结果表明，补充有机铬是一种可行且安全的饲料添加剂，可提高非洲鲶鱼的生长性能。
