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Subject: Fisheries × Author: Gijo Ittoop × Author: KAU × End date: 1999 × Start date: 1990 × Type: Thesis ×
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    ThesisItemOpen Access
    Vitamin C requirement and its deficiency syndromes in Macrobrachium Rosenberg II juveniles
    (Department of Aquaculture, College of Fisheries, Panangad, 1996) Gijo Ittoop; KAU; Sebastain, M J
    An experiment was conducted to study the influence of dietary vitamin e on growth, survival, food conversion ratio, moulting rate and whole body ascorbic acid content of juvenile Macrobrachium rosenbergii, to determine the optimum dietary requirement of vitamin e and to characterise the deficiency syndromes, if any. Juvenile prawns kept under defined environmental conditions were fed casein based semipurified diets containing eight levels of vitamin C. CVC - F 90, a hydrogenated vegetable oil coated form of vitamin C with 90% available ascorbic acid was used as the vitamin source. Growth, survival, food conversion ratio, moulting rate and whole body ascorbic acid content were found to be significantly affected by dietary vitamin C (P≤ 0.01). Below a level of 75 mg CVC - F 90 per kg of dry diet, deficiency syndromes like poor growth, survival and food conversion, incomplete moulting and black lesions at the tip of walking legs were noticed. The maximum weight gain of 194.92% was obtained with a dietary level of 150 mg eve - F 90 per kg dry diet. Non-linear regression estimate based on percentage weight gain showed the optimum requirement to be 200.3 mg CVC - F 90 per kg dry diet which is equivalent to 182.97 mg AAE / kg dry diet. The tissue ascorbic acid level seemed to reflect dietary levels of Vitamin C. About 15 µ gm tissue ascorbic acid / g was required for maximum growth and survival.