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Subject: Food Science and Technology × Author: Malngiang, Samborlang × End date: 2009 × Start date: 2009 ×
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    ThesisItemOpen Access
    Studies on the effect of supplementary feeds on the growth performance of brooders of magur, clarias batrachus (Linn.) and its induced spawning
    (CCSHAU, 2009) Malngiang, Samborlang; Yadava, N.K.
    The present studies were aimed to investigate the effect of supplementary feeds, on the growth performance of brooders of magur, Clarias batrachus and its induced breeding, through hatchery management techniques. Three diets (Diet-I, II and III), containing varying protein levels (25-40% protein), were prepared to find out the optimum protein requirements for the growth of experimental fishes. Results of hydrothermically processed soybean (HPS) of feeding trials have revealed that maximum weight gain, length gain and SGR, significantly (p<0.05) high in the experimental fish fed on this diet (Diet-I), containing about 40.25%. Present studies have further revealed that best growth were observed in the groups of fishes, fed on Diet-I in comparison to group of fish fed on Diet-II and Diet-III. These results have indicated that fish can digest plant protein much easier than that of animal protein, further, the growth was found best at 40.25% protein level of soybean showing that FM can be replaced by soybean up to the protein level 40.25%, without influencing the growth with feed efficiency of the experimental fish. For the induced breeding experiments, three hormones (Ovatide, HCG and Ovaprim), with different doses, were tried. In case of Ovatide, two different doses were tried i.e., @ 1.0 and 1.2 ml/kg body wt. of female brood fish, and in case of HCG (Human Chorionic Gonadotropin) the two different doses were tried @ 4000 and 5000 IU/kg body wt. of female brood fish whereas in case of ovaprim only one dose was taken @ 1.0 ml/Kg body weight of female brood fish. When all the doses of the three hormones were compared, the overall results for spawning, net fecundity, fertilization and hatching have shown that ovatide, used @ 1.00ml/kg body weight; the observed fecundity was 5047 eggs. The total fertilization was 87.29%, and hatching percentage was 65.50, followed by the ovaprim @ 1.00ml/kg body weight and the observed fecundity was 4353 eggs. The total fertilization was 79.79% and hatching percentage was 60.83, In the HCG, the hormone dose was used @ 4000 IU/kg body weight and the observed fecundity was 2501 eggs. The total fertilization was 66.76% and the hatching success percentage was 50.17. The water quality parameters were also analyzed periodically for feeding trials and induced breeding experiments, which were found within the optimal range, during the present studies. The survival rate of fry was found to be independent of the types of hormones used and the rate of various doses, thus, concludes that the better survival of fry/seed population was depending on the excellent hatchery/nursery pond management practices.