With the view to investigate the various changes in hydrobiological features during summer, winter and rainy season and to correlate the same with zooplankton productivity, the limnological survey of Irai river Dist. Chandrapur was undertaken during the year 2003-2004. The parameters such as temperature, conductivity, TDS, pH, CO2 DO have been studied. In the present investigation zooplankton showed low inverse correlation with temperature and pH, while moderate positive correlation with conductivity, turbidity, TDS, CO2. However, dissolved oxygen showed strong inverse correlation with temperature, CO2 and conductivity. In present investigation, among zooplankton Rotifera was the dominant group throughout the study. The highest count of zooplankton was recorded at sampling station D in winter season. The correlation coefficients between each pair of parameter for all possible correlation have been discussed in this paper.

The significant sources of organic pollution enhance nutrient contents in the river water. Nitrogen, phosphorous and silicates play very important role in the biological activities of aquatic environments, such as the abundance of vegetation and faunal status. The Wainganga river water at Pauni town is analyzed for nutrient concentrations their inputs and rate of assimilation by organisms. Phosphate concentration ranged from 0.91 mg/l to 2.29 mg/l, ammonia nitrogen ranged from 0.32mg/l to 1.48 mg/l , nitrate nitrogen ranged from-, nitrite from 2.88 mg/l to 7.64 mg/l.

Some physico-chemical and biological parameters were studied from urban lakeWani, distYeotmal to assess the pollution status. The parameters were studied for the period of one yeari.e. from July 2006 to June 2007. The sample analysis showed great diversity in zooplankton, consisting 65 genera belonging to five groups. The seasonal succession of zooplankton was in the order of summer>winter>monsoon. The physico-chemical parameter such as temperature, pH, CO2, TDS, DO, Sulphate, phosphate have been studied. The correlation analysis was also made between zooplankton and physico-chemical parameter.

At Conductivity of river water increases during the summer and decrease during winter season. High concentration of municipal wastes and domestic activities and less flow of river during summer is responsible for increase of ionic contents in water and conductivity. However, more flow of river in the rainy season and winter dilute the pollutants to some extent and lowers the ionic contents of water (Thomas et al., 2001). It is evident from the observations that, conductivity attains peak values in the months of summer. This may be due to higher chlorides and total dissolved solid contents in river water during summer. The data collected shows that, lower values of conductivity at station A in comparison with the other stations, since, there is no significant source of pollution. The reduced rate of decomposition activities

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