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Summary

The present study reports the weight–length relationships of 22 fish species from middle stretches of the Paraíba do Sul River, a riverine system located in the most important economic regions of Brazil and which is under great pressure due to damming and others ventures. Data were collected quarterly in 2010 and 2011 from three reservoirs and the adjoining downstream by using three different mesh sizes of gill nets. Of the 22 species, eight had no records in the FishBase WLR database; new maximum lengths are given for eight species.