コイおよびニジマスにおけるマンガンおよび銅の要求について〔魚類における無機質の要求-10-〕

概要

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Carp, Cyprinus carpio, and rainbow trout, Salmo gairdneri, were fed on the diets containing different amounts of Mn and Cu for 12 to 16 weeks, respectively. The feeding with the low Mn-diet (4 ppm Mn) resulted in lower growth rate than the control diet (12-13 ppm Mn) in both fish species. In the rainbow trout, the malformation such as an abnormal growth of the tail and the shortening of the body length developed in the fish receving the low Mn-diet. The development of the malformation was considered to be due to the abnormal formation of the bones by the Mn-deficiency. The low Cu-diet (0.7 ppm Cu) produced lower growth rate than the control diet (3 ppm Cu) in the carp and not in the rainbow trout. The contents of Mn and Cu in the tissues from the fish fed with the low Mn-or low Cu-diet decreased distinctly in both fish species. Judging from the experimental results, the potimum dietary levels of Mn and Cu were considered to be around 12-13 ppm and around 3ppm, respectively, in both the carp and the rainbow trout.
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