The present investigation was carried out to determine the morphometric and meristic counts of Etroplus suratensis in lower anicut. Samplings were done for one year period during November 2015 to October 2016. Totally 120 fish samples were examined in both sexes. The length ranges of male are 84 to 215 mm and 83mm to196mm for female. There are twenty morphometric characters have been studied in percentage of total fish length from which five characters were genetically controlled, five characters were intermediate and ten characters were controlled environmentally. Three different categories of morphometric characters of male and female fishes were recognized medium viz. wide range, medium range and narrow range. Morphometric characters varied within the wide range of 101.61%, 100.60%, medium range of 17.36%, 17.12%, and 9.18% and 9.59% of narrow range of male and female respectively. Narrow range is less than 10% range characters were designated. The results showed that the relationship between the different morphometric characters (both dependent and independent variables) were found to be linear relationship highly significant (p<0.001). The meristic characters were counted and draw a fin formula of this fish. The fin formula > < 0.001) . The meristic characters were counted and draw a fin formula of this fish. The fin formula of E. suratensis is D .F XVII-XX (10-14) Pec.F 11-15, Pel F I (4-5), AF ,XIII(9-12), B Sca.tr 24- 26, Ltr Sca 26-58, G.rac 2+2.
