Effect of vermicompost, poultry manure, cow dung and pig manure used to monitor on microbial population in carp rearing pond water of Indian carp fviz. Catla catla, Labeo rohita and Cirrhinus mrigala. The fingerlings stocked @ 30 fish per pond in the ratio of 3 : 4 : 3. The bacterial strains isolated in ponds water treated with different manures were seven gram negative (A. hydrophilla, E. coli, E. aerogens, Shigella sp., K. oxytoca, P. aeruginosa, P. fluorescens) and three gram positive (M. luteus, S. aureus and Streptococcus sp.). The average counts of heterotrophic pathogenic bacteria in poultry manure founded to be maximum in decreasing order followed by pig manure, cow dung, vermicompost, vermicompost and control, respectively. However, bacteria, E. aerogens, P. fluorescens, P. aeruginosa, Shigella sp., K. oxytoca and Streptococcus sp. found absent in vermicompost treatments. All the three species gained maximum growth in vermicompost followed by cow dung > poultry manure and pig manure.
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