Department of Animal Production, Faculty of Agriculture, Kafrelsheikh University, Kafrelsheikh, 33516, Egypt.
Central Laboratory for Aquaculture Research, Abbassa, Sharkia, Sakha Aquaculture Research Unit, Kafrelsheikh, Egypt.
Biol Trace Elem Res. 2022 Mar;200(3):1331-1338. doi: 10.1007/s12011-021-02717-y. Epub 2021 Apr 14.
Microelements are well recognized as an essential approach in the field of aquaculture nutrition. Thus, this study aimed to evaluate copper (Cu) inclusion (0, 0.5, 1, and 2 mg/kg) on Striped catfish performances. Fish fed the Cu-incorporated diets for 60 days, then their growth behavior, antioxidative capacity, and intestinal and liver histological features were evaluated. The results showed a marked enhancement in Striped catfish's growth behavior fed 1-2 mg/kg of Cu, as shown by the final weight, weight gain, and specific growth rate. The feed and protein efficiency ratios were significantly affected by Cu in a dose-dependent manner. The highest level of Cu was accumulated in the whole body, muscle, liver, and gills of fish fed 2 mg/kg of Cu. The carcass composition of Striped catfish showed higher protein content in groups received 0.5, 1, and 2 mg/kg Cu in a linear and quadratic manner (p=0.001). The ash content was quadratically increased in Striped catfish fed 2 mg/kg Cu (p=0.001). However, no marked effects were observed on the moisture and lipid contents and the somatic indices (p>0.05). The incorporation of Cu showed meaningfully increased superoxide dismutase, catalase, and glutathione peroxidase but decreased malondialdehyde level in Striped catfish. The villous height exhibited visible growth and branching with increased doses of Cu without a significant increase in the goblet cells. No abnormal features were observed in the liver and hepatocytes of fish treated with Cu. It can be concluded that Cu is required at 1-2 mg/kg for better performances of Striped catfish.
微量元素是水产养殖营养领域的重要研究方向。因此，本研究旨在评估铜（Cu）添加（0、0.5、1 和 2mg/kg）对条纹鲷生长性能的影响。鱼在 Cu 饲料中喂养 60 天，然后评估其生长行为、抗氧化能力以及肠道和肝脏组织学特征。结果表明，1-2mg/kg 的 Cu 显著促进了条纹鲷的生长行为，表现为最终体重、体重增加和特定生长率的提高。饲料和蛋白质效率比均受到 Cu 剂量的显著影响。在 2mg/kg 的 Cu 组中，鱼体各部位、肌肉、肝脏和鳃中 Cu 含量最高。Cu 以线性和二次方式增加了条纹鲷的体组成分中的蛋白质含量（p=0.001）。2mg/kg Cu 组的灰分含量呈二次增加（p=0.001）。然而，Cu 对水分和脂肪含量以及体尺指数无显著影响（p>0.05）。Cu 的添加显著增加了超氧化物歧化酶、过氧化氢酶和谷胱甘肽过氧化物酶的活性，但降低了丙二醛的水平。随着 Cu 剂量的增加，绒毛高度可见增长和分支，杯状细胞无明显增加。Cu 处理的鱼肝脏和肝细胞无异常特征。综上所述，Cu 的需求量为 1-2mg/kg，以提高条纹鲷的生长性能。
