Physico-chemical characteristics of distillery effluent used for culture of tilapia, Oreochromis mossambicus
1997
Kulkarni, V. | Manissery, J.K.
Fish culture can be incorporated as one of the steps in the efficient management of distillery effluent disposal. Studies were carried out on the culture of tilapia (Oreochromis mossambicus) in diluted distillery effluent and the physico-chemical characteristics of the medium are reported. Three different ratios of distillery effluent: water viz. 25:75, 50:50 and 75:25, each in duplicate, were filled in 6 earthern ponds of 50m square each. Afterwards plankton production ponds were stocked with 100 tilapia fry each. No supplementary feed was provided to the fish during the rearing period of 105 days. Water level was maintained by adding known volume of effluent and water in the respective ratios on every 5th day. Water quality parameters were analysed at 5-day intervals. The distillery effluent had a very high moisture content of 98.7%, and total nitrogen and phosphorus of 1.79 and 1.45% respectively in the dry matter. Alkalinity values recorded were lower than in the treatments and pH was alkaline. Only few samples recorded DO and the highest value was 0.9 ppm. The average values of hardness, BOD, COD and CO2 were higher than in the treatments. In treatments, lower values of DO were recorded initially and at the end of experiment. High free CO2 were recorded initially in all the treatments but were considerably lower after 15 days. Alkalinity values showed the treatment waters to be moderately productive. All treatments recorded high BOD and COD values initially. Decrease in NH3 was observed in all the treatments towards the latter part of the experiment. Ponds that received 25% distillery effluent recorded comparatively better water quality parameters and better fish survival and growth. The results indicate that after proper dilution, distillery effluent can be used for tilapia culture.
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