Length‐weight relationships in 45 Neotropical fish species from the upper Tocantins River basin (Brazil)

Abstract

We provide length-weight relationships (LWR) estimates for 45 species from the upper Tocantins River basin. Specimens were sampled by a standardized set of gill nets varying from 15 mm to 150 mm mesh size for 15 years (from 1995 to 2010) of field works. Field expeditions were carried out in three temporal bins with bimonthly samplings, (i) December 1995 to February 2000, (ii) February 2001 to December 2002, and (iii) February 2009 to December 2010, totalizing 46 field works. For all species, standard length (SL; 0.1 cm precision) and total weight (Wt; 0.01 g precision) were determined using a scale and a digital balance, respectively. From these 45 species, 28 have no previous LRW information in Fishbase, and we also provide new maximum standard length for 16 species. When data for at least 10 male or female individuals were available, we also provided the LWR information separately by gender.