Research Article Open Access

Influence Of Bioremediation On The Growth And Survival Of Cyprinus Carpio Var Koi Using Aquaculture Waste Water

Abstract

 A number of commercial products including live bacterial inocula, enzyme preparation are being promoted for use in improving water quality in aquaculture systems. The present study is an attempt to know the effect of using mixed microbial consortia in the form of a commercial probiotic (Bacillus subtilis, Nitrosomonas, Nitrobacter and Rhodobacter) at various concentration of 0.25g/m3 (T-1), 0.5 g/ m3 (T-2), 1 g/m3 (T-3) and control (without probiotics)to know its ability to remove the nitrogenous compounds, Phosphate-P, BOD and COD from aquaculture waste and making it fit for rearing of Cyprinus carpio var koi. The initial physico-chemical parameters of aquaculture waste water collected from the farm revealed that it was not fit for rearing of fishes. Laboratory study of the microbial inoculum applied demonstrated a greater rate of removal of nitrogenous compounds, phosphate-P, BOD and COD. The total heterotrophic count showed a gradual increase in its count during the bioremediation of the aquaculture waste water when compared to that of control (without probiotics). Probiotics added at the rate of 1g/m3 showed better remediation results when compared to other dosages. The bioremediated rearing system also showed improved water quality as probiotics were added at regular interval .The growth parameters of koi carps in the bioremediated system showed better survival rate (97.25%), average length gain (65.1 ± 1.159 mm), average weight gain (5.279 ± 0.128 g)and specific growth rate (3.37) in treatment -3(1g/m3 ) than other treatments and control. The study proved that the probiotics used was instrumental in improving the water quality, growth rate and survival rate of koi carps. The novel thought behind this study is that aquaculture waste water instead of discharging into the open system can be reused again after bioremediation.

 V. Sonia , C.B.T. Rajagopalsamy, B. Ahilan  And T. Francis

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