SEASONAL VARIATION OF ZOOPLANKTON DISTRIBUTION IN SEWAGE-FED EAST KOLKATA WETLAND, WEST BENGAL, INDIASUBINOY MONDALA, DEBAJYOTI KUNDUA, SMARANYA HAQUEA, TARAKESHWAR SENAPATIA AND APURBA RATAN GHOSHA
A relation between zooplankton periodicity and limnological parameters was studied in sewagefed East Kolkata Wetland (EKWL), a Ramsar site for a period of one year. Physicochemical study has shown temperature, pH, conductivity and TDS ranged between 28.9 and 30.3oC, 7.4 and 8.4, 731.00 and 841.04 μS/cm, 518.5 and 595.0 mg/L respectively. Dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), total hardness, chloride, ammonianitrogen, nitrate-nitrogen, sulphate, phosphate, iron, sodium and potassium concentrations were also studied seasonally. Among these dissolved oxygen concentration in sewage carrying channel (M4) was very less (1.7 mg/L) whereas, ammonia-nitrogen (1.01 to 2.87 mg/L) and nitrate-nitrogen (1.75 to 7.68 mg/L) exceeded the minimum permissible range. Total zooplankton population was correlated with 18 limnological parameters (2 positive, 14 negative and 2 with both positive or negative) in EKWL. Most of the zooplankton species showed negative correlation with pH, temperature, conductivity, chemical oxygen demand, biochemical oxygen demand, total hardness etc., and positive correlation with DO and Na. This in depth study on zooplankton distribution of EKWL is able to establish the relationship between its water quality and fish production, i.e., the main source of earning of the core group of people who are solely dependent on this pisciculture. It can strongly be advocated that risk assessment studies should be conducted and it is an urgent need for water quality restoration and management of EKWL.
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