ビタミンAの要求量と欠乏症 (ニジマスのビタミン要求に関する研究-2,3-)

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By using the test diet listed in Table 1, the vitamin A requirement of fingerlings of rainbow trout, Salmo gairdneri, was examined and the deficiency symptoms were observed. Four groups of the yolk-sac fry were provided and fish were kept for six months on the diets containing respectively 0, 0.5, 2.5 and 50 I. U. of vitamin A acetate per gram on the dry basis, and recovery test was carried out thereafter on some of experimental fish. As shown in Figs. 1-8, avitaminosis was characterized by the retarded growth, high mortality, low hepatosomatic index and anemia. In addition, the fading of body color was recognized in the early stage and followed by the hemorrhage in the eye and the base of fins, and the reversed bent of the gill opercula. These syndromes with the exception of the reversed bent of the gill opercula rapidly disappeared in a few weeks in the recovery test (Table 2, Fig. 7 and 8). On the basis of body weight gain, requirement for vitamin A was estimated to be more than 2.5 I. U. per gram of dry diet in the fingerling weighing less than 7 grams, and approximately 2.5 I. U. or less in the larger fish.
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