Yadava, N.K.Sharma, Kavita2016-11-212016-11-212007http://krishikosh.egranth.ac.in/handle/1/86584The present studies were aimed to investigate the breeding potential of air-breathing catfish, Clarias batrachus, commonly known as Magur for its natural breeding in the pond and induced breeding, through hatchery management techniques. The natural breeding of C. batrachus was carried out with the manipulation of aquatic environmental conditions and therefore, the natural breeding in this fish during the present studies, was made possible with low recovery rate of fry/seed population. For the induced breeding experiments, three hormones (Pituitary gland extract, Ovaprim and Ovatide), with three different doses were tried. In case of Pituitary gland extract, three different doses were tried @ 25, 30 and 35 mg/kg body wt. of female brood fish, whereas, in case of ovaprim and ovatide the three different doses were tried @ 0.6, 0.8 and 1.0 ml/kg body wt. of female brood fish. When all the three best doses of three hormones were compared, the overall results for spawning, net fecundity, fertilization and hatching have shown that ovatide when used @ 1.00ml/kg body weight, the spawning percentage was 81.97, fecundity was 4919 eggs, total fertilization percentage was 82.33, hatching percentage was 55.35 and the net survival of fry 98.52%, followed by the ovaprim @ 1.00ml/kg body weight, with spawning percentage was 76.91, fecundity was 4711 eggs, total fertilization was 78.37%, hatching percentage was 55.68 and net survival of fry was 97.31% and the PG extract, @ 35mg/kg body weight, with spawning percentage was 67.77, fecundity was 4326 eggs, total fertilization percentage was 40.82, hatching percentage 30.38 and net survival of fry 95.75%. The water quality parameters were also analysed for natural and induced breeding experiments which were found within the optimal range during the 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 management practices.enSexual reproduction, Breeds (animals), Biological phenomena, Organic compounds, Eggs, Body weight, Animal developmental stages, Fertilizers, Extraction, IrrigationThesis