Abstract:
Primary productivity, i.e. Gross primary productivity (GPP), Net primary productivity (NPP) and Community respiration (CR) were estimated in three pig dung treated fish ponds. The present investigation envisage on the estimation of primary productivity in carp polyculture system in three pig dung manured ponds. The monthly estimations were done for three years. Pig density were 30, 40 and 50 pigs ha-1 in the 1st, 2nd and 3rd year respectively, while fish density was kept constant at 8500 nos. ha-1. The control received no pig dung. As the density of pigs ha-1 increased, primary productivity of the treated ponds were also found to increase. The highest values were observed in the 3rd year when pig density ha-1 water area was the maximum (50 pigs ha-1). The effect of available nutrients and water temperature was significantly observed in augmentation of primary productivity. The GPP, NPP and CR were found to be much lower in the Control being 0.940 ± 0.246 gCm-2d-1, 0.600 ± 0.264 gCm-2d-1 and 0.502 ± 0.345 gCm-2d-1 respectively. However, NPP:GPP was the highest in the Control where organic load was minimum.
Author Name : Krishna Kanta Tamuli, Sangipran Baishya, Ranjit Bordoloi & Subha Ganguly
Keywords: Productivity, Integrated fish farming.
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