The present study was aimed towards the impact of environmental pollution caused by Calcutta Leather Complex (CLC) industries near Bantala on Chiti Kankra (Varuna litterata) population. Round the year (July 2016-June 2017) survey indicates that almost complete absence of Varuna litterata along the prodirection of industrial effluents in relation to time lapse, biodegradation and other environmental components. From inputs of local fishermen and villagers, it was informed that the abundance and distribution of Varuna litterata was plenty decades ago in the concerned water ways to that of other part of coastal Sundarbans and Midnapore estuarine distributaries. Now nearly absolute absence of Varuna litterata fingers the effect of physico-chemical pollutant components drained out of Calcutta Leather Complex. The pollution toxicity is the composition of B.O.D, C.O.D, salinity, pH change of water, sulphate, phosphate, chloride, heavy metal like chromium and solid slug etc. The work is in progress to find out the main toxicants producing grave impact on the life history stages, feeding, reproduction and migration as a whole in ecology of Varuna litterata.
