The study of length-weight relationship ofLabeo bata (Ham.) revealed that this fish did not strictly follow the cube law and the weight increases at a rate more than the cube of the length. No significant difference was noticed in the value ofn by the analysis of covariance between the fishes of different size, sex and maturity stages in a population. The equations for length-weight relationship areW=0.2821×10−5 L3·3109 for the males,W=0·3388×10−5 L3·2026 for the females,W=0·2588×10−5 L3·3832 for the juveniles andW=04·893×10−5 L3·1667 for the combined fishes.