The length-weight relationship of Liza parsia of Cochin Estuary was calculated separately for indeterminates, males and females. The logarithmic regression equations obtained are -males: log w = -1.2117 + 2.5619 log 1; female: log w = -1.0628 + 2.4465 log 1 and indeterminates: log w = -1.2468 + 2.6788 log 1. The 'r' values revealed very good correlation between length and weight. Analysis of covariance showed the ‘b' values of male, female and indeterminate significantly differ at 5% level. Paired comparison using students ' f' clearly showed that except between female and indeterminates, the 'b’ values are not significantly different at 5% level. By testing the regression coefficients against the isometric growth value it is found out that the former values showed statistically significant difference from the expected value of ‘3', hence concluded that w = al³ will not be a proper representation of the length-weight relationship of this species and the growth pattern in this case is different from isometric growth of fishes.