Yadava, N.K.Manju Rani2016-11-192016-11-192008http://krishikosh.egranth.ac.in/handle/1/86488Present studies, ten diets (1-10) for the fry and fingerling of magur Clarias batrachus were prepared the with varying protein levels (35, 38, 40, 42 and 45%) were formulated using fishmeal (diet 1-5) and the processed soybean (diets 6-10), as the protein sources. Two hundred fry and fingerlings were randomly released @ 15 per aquaria and then fed for 45 days at 5 percent body weight, per day on the ten experimental diets. Fry and fingerlings were maintained under laboratory conditions (LD 12:12 at 25°C). Studies have revealed that, when live feed is given to fry, then better growth was obtained in comparison to the group fed on the supplementary feed (soybean based) which shows that live feed is the better feed for fry. The studies have further shown that optimum dietary protein levels, which have resulted significantly (P<0.05) with high growth, in terms of live weight and length gain, SGR (% d-¹), growth percent gain, nutrient retention (PER and APD%) and accumulation of carcass protein and fat were observed in the groups, fed on diets containing 4025% protein irrespective of the protein source. Activities at 40.25% dietary protein also support high digestibility and nutrient retention. Studies have further revealed that the growth, nutrient retention and energy retention values were significantly ((P<0.05) high in the group fed on diet containing 40.25% dietary protein from processed soybean (plant based) in comparison with the group fed on diet containing fishmeal (animal based), as the protein source. Postprandial excretory patterns of ammonical nitrogen and orthophosphate production were not affected by the dietary protein quality and quantities, however, fingerlings fed on soybean containing diets excreted significantly (P<0.05) low levels ammonical nitrogen and orthophosphate, in comparison with the fingerlings fed on fishmeal based diets. Therefore, it is evident that supplementary diets with 40.25% crude protein is required for the optimum growth for the magur, Clarias batrachus fingerlings and live feed is best for the fry of C.batrachus.enBacteria, Productivity, Sampling, Biological phenomena, polysaccharides, diseases, proteins, extraction, Processed animal products, WoodThesis