1996

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Browsing 1996 by Author "Jayaprakas, V"

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    Effect of Dietary L-carnitine on Growth and Reproductive Performance of Male Oreochromis mossambicus (Peters)
    (Society of Fisheries Technologists (India)Cochin, 1996) Jayaprakas, V; Sambhu, C; Kumar, S. Sunil
    Cultured male tilapia was fed diets supplemented with various levels of L-camitine for 252 days and its growth and reproductive performance were evaluated. Carnitine administration produced growth enhancement, increasing with dosage. Carnitine stimulated feed conversion efficiency, better digestibility and high enzyme activity. The RNA-DNA and protein contents in the muscle and liver also increased concomitant with high growth rate. Carnitine induced lipid catabolism leading to reduction in lipid content of cultured fish, using lipid as energy source while sparing protein for anabolic processes. Significantly high GSI, sperm cell concentration, motility and percentage viability of the spermatozoa in carnitine treated tilapia were observed.
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    Effect of Hormones on Growth and Food Utilization of the Indian Major Carp, Cirrhinus mrigala
    (Society of Fisheries Technologists (India)Cochin, 1996) Jayaprakas, V; Sindhu, B.S
    The influence of human chorionic gonadotropin (HCG) and testosterone propionate (TP) at the dosages of 10 ppm and 3 ppm respectively, and their combination (HCG+TP) of 8 ppm and 1.5 ppm on the growth, food conversion, digestibility, enzyme activity, nucleic acid content. Oxygen consumption and ammonia excretion of the Indian Major Carp, Cirrhinus mrigala was assessed. The experiments were conducted in cement tanks (5x4x1 m) for 98 days by feeding hormones through fish meal based prepared diet having 35% protein. Growth of C. mrigala was high in hormone fed fishes than the control with the maximum growth recorded in the HCG treatment followed by HCG+TP, TP and control. Specific growth rate (SGR), food conversion efficiency (FCE), apparent protein and lipid digestibility were high in hormone fed fishes (p < 0.01) than the control. The enzyme activity in the foregut, midgut and hindgut showed marked variation with the highest activity noticed in the foregut followed by midgut and hindgut. The rates of oxygen consumption and ammonia excretion of hormone fed fishes were found to be not significantly different from control (P > 0.05). The hormones stimulate growth through increasing the appetite and enhancing food utilization and protein synthesis.