Growth performance of major carps in a polyculture system at low (500/acre) and average (1000/acre) stocking densities
2002
Tabassum, S.
Labeo rohita, Catla catla and Cirrhinus mrigala were stocked in a ratio of 30%, 40% and 30% respectively. In pond I 19 Labeo rohita 25 Catla catla and 19 Cirrhinus mrigala were stocked. This stocking was done at the rate of 500 major carps/acre. On the same pattern 38 Labeo rohita 50 Catla catla and 38 Cirrhinus mrigala were stocked in pond 2. This stocking was done at the rate of 1000 major carps per acre. Artificial feed (Maize gluten) was given at the percent of fish body weigh daily for six months. Ammonium nitrate was added at the rate of 0.2 percent of nitrogen of fish body weight daily. About 25% fishes were netted out from all the ponds fortnightly, to monitor the growth performance viz.; body weight and total length. After recording the data fish were released back into their respective pond. Water from all the ponds was analyzed, for its physico- chemical characteristics. The maximum weight grain 134 gm, 34 gm and 76 gm was recorded in pond I in which stocking density was done at the rate of 500 major carps per acre. In pond 2, the maximum weight gain 1288, 64 gm and 28 gm were noted in which stocking density was done at he rate of 1000 major carps per acre. The final harvesting of fishes in two treated ponds showed that maximum fish production was in pond I followed by pond 2. Maximum weight gain was noted in July, August and September. This was due to optimum temperature. Increase in body weight and total length was positively and significantly correlated with the increase in temperature. Water temperature was negatively correlated with dissolved; oxygen. The inter-pond difference of physico-chemical parameters were non-significant.
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