Abstract.-A three month long experiment was conducted to evaluate the effect of stocking density on the growth and survival of indigenous catfish Heteropneustes fossilis in cemented cisterns (each of 1.25 m 2 size) situated by the side of Faculty of Fisheries, Bangladesh Agriculture University, Mymenisingh. Water quality parameters (temperature, pH and dissolved oxygen) were recorded throughout the study period and found within the suitable range. Three stocking densities used were 8, 16 and 24 fishes/m 2 and designated as Treatment-I, Treatment-II and Treatment-III, respectively. Each treatment had two replicates. All the fish were of same age group having mean length and weight of 5.2±0.28 cm and 9.4±0.58 g, respectively. Experimental fish were fed with formulated pelleted feed (30% protein), containing wheat bran, rice bran, mustard oil cake and fish meal. The result of study showed that the fish in treatment-I stocked at the rate of 8 fish/m 3 significantly (P<0.05) showed increase in individual length and weight followed by treatment-II and III. There was significant (P<0.05) variation among the survival rates of fish which ranged between 100 and 80%. The net production in different treatment were 0.206, 0.38 and 0.406 kg/m 3 /90 days for treatment-I, II and III, respectively. The result of the present study indicated that the best individual growth of H. fossilis was obtained at a density of 8 fish/m 3 but the total production was obtained at a stocking density of 24 fish/m 3 in cemented cistern fed with formulated feed.

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A research study was conducted to investigate the culture possibility of fresh water catfish Pangasius pangasius with formulated feed in natural ponds. The stocking density was chosen as 8000 fry/ha with an initial weight of 42.57+ 2.51 g. The formulated feed contained 45 % fishmeal, 30 % mustard oil cake, 15 % wheat bran and 10 % rice bran to supply 40.48 % protein in feed. The growth of Pangasius pangasius in terms of net weight gain was found as 266.49g, which was statistically significant (p<0.05). The food conversion ratio (FCR) observed during this research study was high (7.58). There was no variation in the biochemical composition of the fish as a result of such culture technique and experimental conditions. The whole experiment was conducted for a period of 10 months. Production of fish was found to be 2.13 tones/ha using this formulated feed.