Length-weight relationships for Brazilian estuarine fishes along a latitudinal gradient

Ninety-nine length-weight relationships (LWR) were estimated for 70 bentho-demersal fish species captured in four Brazilian estuaries between latitudes 0 degrees S and 25 degrees S. LWR are published for the first time for 13 species. The allometry coefficient (b) of the LWR (W = aTL(b)) showed a median of 3.147. Positive allometry was dominant (64 of the 99 species x estuary cases), followed by isometry (28) and negative allometry (7). Twenty-two species were caught in two or more estuaries. In most cases (29 of 33 comparisons), the values of both regression parameters differed significantly among estuaries.