The length-weight relationship ofXenentodon cancila (Ham.) was calculated for males and females. A total of 416 females and 141 males ranging from 101–230 mm in total length was used for the study. Results showed that there is a close relationship between the length and weight of fish. Significant difference was found between the regression coefficients of males and females ofXenentodon cancila. By testing the regression coefficients against the isometric growth values of 3, it was seen that for both males and females, the growth pattern agrees with the isometric growth formula.