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Not AvailableThe Indian part of the Sundarbans, a mosaic of 102 islands, is separated by about 1750 ssquare kilometres water area, including tidal rivers, creeks and brackish water lagoons which form a major capture fishery resource of the area. A study was conducted to understand present fish species distribution in different rivers inside Sundarbans in reported increased salinity regime of these rivers. Salinity was much higher in the Matlah river system as compared to the Hooghly river system. Also, parameters related to salinity such as specific conductivity, total hardness etc. were found differ widely between the Hooghly and the Matlah river system. Higher salinity has its influence on estuarine fish species distribution in the Matlah river system. Many euryhaline fish species such as Bregmaceros mcclellandi, Lutjanus johni, Macrospinosa cuja, Therapon jarbua, Harpadon nehereus etc. are present in plenty in the Gosaba-Sajnekhali area in the Matlah river system whereas they were absent in the Hooghly river at Diamond Harbour. Roychak in the Hooghly estuary and Canning in the Matlah estuary revealed similar phenomenon of occurrence of Eleutheronema tetradactylum, Anodontostoma chacunda, B. mcclellandi, Upeneus sulphureus etc. in bag net catch at Canning whereas Roychak bag net catch was dominated by Otolithoides pama, Setipinna phasa etc. A major difference was noted in the landing of the prized Tenualosa ilisha which is scarcely available in the rivers of the Matlah river system.Not Availabl