Biochemical studies on L-ascorbic acid in aquatic animals. XIII. Nonessentiality of ascorbic acid in the diet of carp.

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Abstract
Research was undertaken to determine whether the capacity of ascorbic acid synthesis in carp is sufficient for their own requirement of the vitamin. Two groups of carp, which had been fed the ascorbic acid-supplemented and the ascorbic acid-free diet, were examined for various in-dicators of ascorbic acid deficiency as follows: growth, mortality, hemoglobin content, collagen content in the centra, ascorbic acid contents in the hepatopancreas, kidney, serum, serum alkaline phosphatase, and hepatic phosphoglucomutase and L-gulonolactone oxidase activities. No differences in the above indicators were observed between the two groups of carp (initial body weight, 35g, on the average) fed the experimental diets for 84 weeks. Also, in the case of younger carp (initial body weight, 0.25g, on the average), elimination of ascorbic acid from the diet had no effect on growth, mortality, or ascorbic acid content in the hepatopancreas. Neither were any apparent deficiency symptoms observed in groups of two different ages, which were given the ascorbic acid-free diet. These findings indicate that ascorbic acid is not essential in the diet of carp under normal conditions.

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