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日本东京水产大学最近通过实验证明,一定量的锰和铜离子是鲤鱼和魟鳟饲料中必需的微量元素。实验中采用的鲤鱼和魟鳟的饲料是相同的,都以蛋白朊做为蛋白质的来源。饲料中锰离子的量靠硫酸锰、铜离子的量靠氯化铜来调节。不加锰盐的饲料含锰量为4ppm,加锰对比饲料为13ppm;不加铜盐的饲料含铜0.7ppm,而加铜对比饲料为3.0ppm。用这些饲料饲喂实验鱼12—16周,其结果为:
Japan’s Tokyo Fisheries University recently passed experiments to prove that a certain amount of manganese and copper ions are essential trace elements in feeds for carp and trout. The carp and trout used in the experiment were the same feedstuffs, all of which used protein as a source of protein. Manganese ions feed the amount of manganese sulfate, copper ions by the amount of copper chloride to adjust. Manganese-free feed had a manganese content of 4 ppm and manganese plus feed was 13 ppm, copper-free feed contained 0.7 ppm copper, and copper-added feed was 3.0 ppm. The experimental fish were fed with these feeds for 12-16 weeks and the results were: