Dietary pyridoxine requirement of the Indian catfish, Heteropneustes fossilis
2001
Mohamed, J.S.
Indian catfish were fed semi-purified diets containing 0, 1.7, 3.4, 6.5, 13.5 and 27.2 mg/kg of pyridoxine for 15 weeks. The highest weight gain was for fish fed the diet supplemented with 3.4 mg pyridoxine/kg, followed by fish fed the diets with 6.5, 27.2, 13.5 and 1.7 mg pyridoxine/kg, and the lowest in fish fed the unsupplemented control diet. Patterns of feed efficiency ratio (FER) and protein efficiency ratio (PER) were similar to those of the weight gain. Survival of fish fed the control and pyridoxine-supplemented diets were 45% and 80% to 100%, respectively. Pyridoxine deficiency signs such as anorexia, lethargy, pale body colour, tetany, convulsions and haemorrhages in intestine and kidney were observed in fish fed the pyridoxine-free diet. Anaemia in pyridoxine deficient fish was characterized by pale livers, spleens and gills. Fish fed 3.4 mg pyridoxine/kg, showed higher erythrocyte number (RBC), haemoglobin (Hb) and haematocrit (Ht) and lower mean carpuscular volume (MCV) than those fish fed the other diets. The maximum liver pyridoxine content and alanine aminotransferase (AAT) activity were observed in fish fed the 3.4 mg pyridoxine/kg diet. The associated liver pyridoxine content and AAT activity for maximum growth ranged from 3.24 to 4.65 microgram/g tissue and 2.45 to 3.50 mol pyruvate X 10(6)/mg liver(.)h, respectively. Broken-line regression analysis showed that the optimum dietary pyridoxine requirement for maximum growth of Heteropneustes fossilis under these experimental conditions was 3.21 mg/kg diet.
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