Thirty groups of twenty juveniles each of Nile tilapia (Oreochromis niloticus, initial average weight 23.93 ± 0.80 g) were fed diets containing increasing amounts (0%, 25%, 50%, 75%, and 100% of levels used by the tilapia feed industry) of organic trace mineral (Fe, Zn, Mn, Cu, Se) supplementation for 56 days. Growth was not affected by the dose of mineral supplementation. However, body protein increased in fish fed intermediate doses of organic minerals, reaching a maximum at 40.44% supplementation. Doses >50% showed mild damage to the intestinal tissue. Body Fe, Zn and Cu deposition were highest at 28.32%, 24.43% and 78.45% supplementation, respectively. Tilapia could modulate intestinal morphology when fed different doses of organic minerals. As the supplementation doses increased, hemosiderin staining increased in the distal intestine and total body Fe content, indicating that the distal region of the intestine plays an important role in iron excretion by tilapia. Supplementation of organic trace minerals at intermediate doses does not harm Nile tilapia growth, but excessive trace mineral supplementation can impair body protein retention and promote histological alterations in the gut.

中文翻译：

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尼罗罗非鱼幼鱼日粮中有机痕量矿物质的含量不同会改变肠道特性和身体组成，但不会改变其生长

尼罗罗非鱼（Oreochromis niloticus）的30个成年幼体，每组20个幼体饲喂日粮，初始平均重量为23.93±0.80 g），这些日粮中所含有机痕量矿物质（铁，锌，锰的量不断增加（罗非鱼饲料工业使用的水平分别为0％，25％，50％，75％和100％）） ，铜，硒）补充56天。生长不受矿物质补充剂量的影响。但是，在鱼中添加了中等剂量的有机矿物质后，体内蛋白质增加，在补充40.44％时达到最高。＞ 50％的剂量显示对肠组织的轻度损害。体内铁，锌和铜的沉积最高，分别为28.32％，24.43％和78.45％。当饲喂不同剂量的有机矿物质时，罗非鱼可以调节肠道形态。随着补充剂量的增加，远端肠道的铁血黄素染色增加，并且体内总铁含量增加，表明肠的远端区域在罗非鱼排铁中起重要作用。以中等剂量补充有机微量矿物质不会损害尼罗罗非鱼的生长，但是过量微量矿物质的补充会损害人体蛋白质的保留并促进肠道的组织学改变。