Dietary Choline Requirement of Fingerling Yellowtail.

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Two experiments were conducted to identify choline deficiency signs in fingerling yellowtail, <I>Seriola quinqueradiata</I> and to determine their dietary requirement for this vitamin. Fingerlings were fed purified diets with and without supplemental choline chloride (control and choline-deficient diets, respectively) for a period of 20 days. Fish fed the choline-deficient diet developed deficiency signs such as anorexia and poor growth within 5 days. On day 8, the diet for half of the choline-deficient fish was changed to the control diet, which contained 800 mg choline chloride/100 g of diet. Deficiency signs in these fish disappeared whithin 3 days. In the requirement experiment, diets with nine levels of choline chloride (0, 10, 25, 50, 100, 200, 300, 400 and 800 mg/100 g of diet) were fed to fingerlings for a period of 17 days. Weight gain and liver choline data indicated that the choline requirement of fingerling yellowtail are 210-290 mg (as chloride)/100g of diet.
日本水産増殖学会の論文