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ThesisItem Open Access Effect of different manures on the hydro-biological parameters, bacterial population and growth performance of Indian major carps(CCSHAU, 2013) Sunita; Gupta, R.K.In the present investigations, the experiment was carried out in 18ft×20 ft sized ponds from Sept., 2011 to Aug., 2012 at the Fish Farm Hatchary of CCSHAU, Hisar. Different organic fertilizers i.e Vermicompost @ 15,000, Vermicompost @ 10,000, cow dung @ 10,000, poultry manure @ 6,000, pig manure @ 4,000 kg/ha/yr and control were used to monitored their effect on water quality parameters, bacterial population and growth performance of Catla catla (as surface feeder), Labeo rohita (as column feedrer) and Cirrhinus mrigala (as bottom feeder). One forth dose of fertilizers were applied 15 days prior to fish stocking and remaining doses given at fortnightly interval. The fry/fingerlings were stocked @ 30 fish per pond in the ratios of 3:4:3 and fed upon supplemented feed given at 2% of their body weight. The water parameters like DO, pH, alkalinity, hardness, temperature, turbidity, free CO2, nitrogen, potassium, phosphorous and planktons were found in optimum range in all treated ponds. The maximum values of dissolved oxygen (5.81 to 8.65 mg/l), turbidity (35.96 to 16.30 cm), phytoplanktons (99 to 5,786 no/l) and zooplanktons (186 to 2,046 no/l) were observed in pond waters treated with vermicompost @ 10,000 kg/ha/yr. While that of pH (5.63 to 5.80), alkalinity (200.00 to 360.62 mg/l), hardness (173.06 to 292.02 mg/l) were found to be maximum in vermicompost @15,000 kg/ha/yr. Free CO2 (1.40 to 3.40 mg/l) and nitrogen (0.990 to 0.170 mg/l) were found to be maximum in the pond waters treated with cowdung @ 10,000 kg/ha/yr. Temperature (26.53 to 34 oC), potassium (3.24 to 23.94 mg/l) and phosphorous (0.72 to 0.199 mg/l) were found to be maximumin in the pond waters treated with poultry manure @ 4,000 kg/ha/yr. The range of water parameters increased significantly (P<0.05) in the pond waters treated with different manures. The bacterial strains isolated in pond waters treated with different manures were 7 gram negative (A. hydrophilla, E. coli, E. aerogens, Shigella sp., K. oxytoca, P. aeruginosa, P. fluorescens) and 3 gram positive (M. luteus, S. aureus and Streptococcus sp.). The average counts of pathogenic heterotrophic bacteria in poultry manure @ 6,000 kg/ha/yr was found to be maximum in decreasing order followed by pig manure @ 4,000kg/ha/yr, cow dung @ 10,000 kg/ha/yr, vermicompost @ 15,000 kg/ha/yr, vermicompost @ 10,000 kg/ha/yr and control, respectively. However, bacteria, E. aerogens, P. fluorescens, P. aeruginosa, Shigella sp., K. oxytoca and Streptococcus sp. were absent in vermicompost @ 10,000 and vermicompost @ 15,000 kg/ha/yr treatments. All the three species gained maximum growth in vermicompost @ 10,000, followed by vermicompost @ 15,000, cow dung @ 10.000, poultry manure @ 6,000 and pig manure @ 4,000 kg/ha/yr, respectively. Among the 3 species L. rohita showed maximum growth followed by C. catla and C. mrigala. There was two times more growth of Indian major carps in pond treated with vermicompost @ 10,000 kg/ha/yr as compared to control.