The lenght-weight relationship of Orthopristis rubber (Cuvier, 1830) in the Sepetiba Bay (22º54'-23º04'S; 43º34'-44º10'W), Rio de Janeiro was determined. It aims to contribute to morphometrics knowledge of this species in a semi-closed coastal area and to supply basis for comparisons with others environment. Fishes were collected by beach seine (juveniles) and otter trawl (adults) from October 1998 to September 1999. The equation found was W = 0,000006 L3,1368 for males and W = 0,000006 L3,14º3 for females. Positive allometry was found for both sexes and sex rate was 1:1. The comparatively high values for allometric coefficient indicate high investment in growth, which can be due to relatively small size of the examined fish populations, or a mechanism to overcome stress conditions in the area.
Grunts; allometry; coastal fishes; bays; morphometrics
