Growth performance of major carps in polyculture system at low (500/acre) and average (1000/acre) stocking density
2001
Yasmin, F.
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 rate of two percent of fish body weigh daily for six months. Ammonium 1, 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 physicochemical characteristics. It was conducted that maximum weight gain 65 gm, 74.7 gm and 72 gm were 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 55.38, 44.6 gnu and 21.3 gin were noted in which stocking density was done at the 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 June and July. 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 differences of physicochemical parameters were non-significant.
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