A feeding trial was conducted to evaluate the dietary copper requirement of red drum (Sciaenops ocellatus) and compare the bioavailability of copper sulphate (CuSO₄) and copper‐ethanolamine. A basal diet was formulated using semi‐purified ingredients and analysed to contain 3 mg Cu/kg. Both copper sources were supplemented to the basal diet at either 5, 10 or 20 mg Cu/kg of dry diet. No significant differences were observed in growth performance of fish fed the various diets. However, red drum fed all copper‐supplemented diets retained more copper in liver and whole‐body tissues compared to fish fed the basal diet. Within both inorganic and organic copper treatments, the highest tissue copper concentrations were observed in fish fed diets supplemented with 10 mg Cu/kg. No significant differences were detected in net copper retention regardless of the nature of the copper source; hence, the bioavailability of copper sulphate and copper‐ethanolamine complex was not different in the diets for juvenile red drum. Furthermore, the minimum copper requirement for growth performance of juvenile red drum appeared to be satisfied when fish were fed the basal diet containing 3 mg Cu/kg diet, and no detrimental effects were observed in red drum fed diets supplemented with 20 mg Cu/kg.

中文翻译：

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添加无机和有机日粮铜对幼年红鼓鱼（Sciaenops ocellatus L.）生长性能和组织组成的影响

进行了一项饲养试验，以评估红鼓 (Sciaenops ocellatus) 的膳食铜需求，并比较硫酸铜 (CuSO₄) 和铜乙醇胺的生物利用度。使用半纯化成分配制基础日粮并分析其含有 3 mg Cu/kg。两种铜源均以 5、10 或 20 mg Cu/kg 干日粮添加到基础日粮中。喂食不同饮食的鱼的生长性能没有观察到显着差异。然而，与喂食基础饲料的鱼相比，喂食所有添加铜的饲料的红鼓鱼在肝脏和全身组织中保留了更多的铜。在无机和有机铜处理中，在添加 10 mg Cu/kg 的鱼饲料中观察到最高的组织铜浓度。无论铜源的性质如何，在净铜保留率方面均未检测到显着差异；因此，硫酸铜和铜-乙醇胺复合物的生物利用度在幼鱼的饮食中没有差异。此外，当鱼饲喂含有 3 mg Cu/kg 日粮的基础日粮时，幼鱼对生长性能的最低铜需求似乎得到满足，而在添加 20 mg Cu/kg 日粮的红鼓鱼饲喂日粮中未观察到有害影响.