FT Vol.33(2)

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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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    Length-Weight Relationships and Relative Condition Factor in Priacanthus hamrur (Forsskal)
    (Society of Fisheries Technologists (India)Cochin, 1996) Philip, K.P; Mathew, Kuruvila
    The length-weight relationship of Priacanthus hamrur was estimated and given by the equations. Males W = 0.00000638 L31133 and Female W = 0.00000811 L3 685. The b value showed significant difference between males and females. The b value computed for female did not show significant variation for the isometric value of 3 whereas in male the departure was found significant. In male and female the Kn value steadily increased up to about 100 mm and remained almost static up to about 150 mm and thereafter showed fluctuation. The seasonal change taking place in Kn value mainly indicate that in P. hamrur it is greatly influenced by feeding intensity rather than the cyclic change taking place in the gonads.
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    Microbial Profiles of Non-Irradiated and Irradiated Semi-dried Fish
    (Society of Fisheries Technologists (India)Cochin, 1996) Vinh, P.Q; Alur, M.D; Nair, P.M
    Semi-dried non-irradiated anchovies (Anchoviella commersoni), initially exhibited the presence of Micrococcus (15%), Bacillus (60%) and Staphylococcus (20%) microflora. On the other hand, Bombay duck (Harpodon nehereus) and Vietnam scads (Alepes mate) were found to be contaminated predominantly by Bacillus and Staphylococcus sp. respectively. Irradiation (3 kGy) of semi-dried anchovies resulted in modification of microbial composition which comprised of Bacillus (50%) and Staphylococcus (50%), while microflora of semi-dried irradiated Bombay duck consisted of Bacillus sp. only. These results suggested that irradiation of semi-dried fish resulted in the elimination of Micrococcus leaving the survivors belonging to Bacillus sp. and Staphylococcus sp.
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    Static Bioassay with Liza parsia Exposed to Copper Sulphate, Zinc Sulphate and Lead Nitrate
    (Society of Fisheries Technologists (India)Cochin, 1996) Mohapatra, B.C; Rengarajan, K
    Short-term static bioassays were conducted on the brackishwater mullet, Liza parsia to determine the combined effect of copper sulphate, zinc sulphate and lead nitrate in the ratio 1:1:1. From probit analyses the LC50 values for 12, 24, 72 and 96 hours were found to be 160.5,152.2, 135.6,117.1 and 106.7 ppm, respectively. The toxicities of these elements were found to be "additive" in nature.
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    Technology Choice Under Risk in Marine Fishing
    (Society of Fisheries Technologists (India)Cochin, 1996) . Das, T.K; Neogy, R; Chakraborty, D
    A risk programming model has been developed for investment decision in marine fishing. The model has been applied on survey data in Digha coastal region ofWest Bengal in India. Results of the model have been analysed in the light of risk aversion.