Existence of L-gulonolactone oxidase in some teleosts.

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Abstract
This study deals with the species distribution in fishes of L-gulonolactone oxidase (EC, 1.1.3.8), which catalyzes the conversion of L-gulono-γ-lactone to L-ascorbic acid (AsA). In carp, the activity was found in the hepatopancreas with a faint activity in the kidney and dark muscle, and the enzyme was located in the soluble fraction from the hepatopancreas. The activity of carp hepatopancreas was about one-third that of rat liver. This enzyme was also found in the hepatic tissues of gengorobuna, ugui, and catfish which belong to Cypriniformes but has not been detected in any of the other fishes so far tested, such as rainbow trout, amago, ayu, eel, red sea bream, yellow-tail, kawahagi, and tilapia. These findings suggest that some fishes are able to synthesize AsA and be independent of a dietary source of the vitamin under normal conditions.

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