RESULTS AND DISCUSSIONLevels of vitamin C significantly influenced weightgain of common carps (Table 2).Weight gain increased with an increase in levels ofvitamin C. SGR of fries also followed the similar pattern asobserved with weight gain. Protein efficiency ratio (PER)was significantly higher in treatment 2 compared withother groups and lowest in control group (withoutsupplementation of vitamin C). Lower feed conversionratio (FCR) was observed in treatment 2. Survival rate ofcommon carp did not differ among the treatments.Carcass proximate and vitamin C content of fish fedthe various diets are presented in Table 3.The crude protein content was significantly (P<0.05)higher in fish in treatment 1 than those in treatment 3 and4, but it did not differ from fish in treatment 2. There wereno differences in lipid or ash content among thetreatments.Weight gain, with reduced values for fish fed thebasal diet, increased with increases in dietary vitamin Eup to the requirement level was observed. Increasedascorbate levels in tissues and increased dietaryascorbic acid levels show a linear relationship in manyfish species [9]
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