Length-weight relationships of 11 fish species from streams of Anapu River Basin, State of Pará, eastern Amazon, Brazil

The present study shows the length-weight relationships (LWR) for 11 stream fish species from Anapu River Basin, in eastern Amazon, Para State, Brazil. Samplings were carried out in October and November 2010, 2012 and 2013, and fishes were collected using hand nets of 55 cm of diameter and 2 mm mesh size. Fixed specimens were measured for standard length (cm) and total weight (g). Allometric coefficients b varied from 2.606 to 3.335 and coefficients of determination (R-2) varied from 0.902 to 0.986. Shrinkage effect must be considered in future investigations in order to provide a correction factor.