The regression parameters for intercept (a) and slope (b) of the length (L)-Weight (W) relationship for the model W = a.Lb were determined in Pomadasys maculatum (Bloch 1797) (family: Pomadasyidae). Data on fish size was gathered for 221 male and 231 females fishes collected from Karachi coast and analyzed with correlation and regression to determine relationship of fish weight with standard (SL) and total (TL) lengths in male, female separately and with pooled data for the two sexes. The magnitude of exponents (b) varied only slightly in the regression equations. The t-test for various pairs (male vs. female, male vs. pooled sexes and female vs. pooled sexes) for SL or TL as independent variables indicated the differences among the values of b statistically insignificant at p < 0.05. The regression lines were therefore parallel in this species. The magnitude of b was in all cases near 3 which indicated that that this fish grew symmetrically and isometrically.
