RajeshPandey, Tanuja2019-01-302019-01-302018-06http://krishikosh.egranth.ac.in/handle/1/5810092879The present study was conducted to observe the effect of stocking density on growth and survival of Pangus (Pangasianodon hypophthalmus) in circular FRP tanks for a period of 3 months having capacity of 4.9 m3. A total of 2160 fishes were randomly divided into four different stocking density 30, 40, 50, 60 fish/m3 and designated as treatment T1, T2, T3 and T4 respectively. Each treatment has three replicates and is maintained water volume 4000 litres in all experimental tanks. All the fishes were stocked in each tank having average length and weight 10.07􀁲0.009 cm and 22.07􀁲0.009g respectively. After one week of acclimatization period, the experimental fish were fed with a diet containing 30% protein. The feed was given twice a day (morning and evening) @ 10% of the total body weight for the first month and then reduced to 5% of the total body weight for the remaining two months of the rearing period. Growth parameters (feed conversion ratio, weight gain, specific growth rate, survival rate, condition factor) and water quality parameters (temperature, pH, dissolved oxygen, free carbon dioxide, total alkalinity, total dissolved solids) were analysed during the study period. The result of water parameters showed no significant difference (P>0.05). The study showed that fish in treatment T1 stocked at the rate of 30 fish/m3 indicate the best individual weight gain followed by T2, T3 and T4 respectively. The specific growth rate (SGR) ranged between 0.40 to 0.49 % per day, the food conversion ratio (FCR) values ranged between 1.78 to 1.84 with treatment T1 resulting the lowest FCR. The growth performance and survival was influenced by stocking density. A decreasing trend are found in final weight of fishes along with the increasing stocking density. The present study revealed that best individual growth and survival of Pangasianodon hypophthalmus were obtained at a stocking density of 30 fish/m3 but the highest total biomass production was found at a stocking density of 60 fish/m3 in circular FRP tanks.ennullThesis