Abstract
Summary Length-weight (LWR) and length-length (LLR) relationships were estimated for 20 species and lengths at first maturity (L50) for six species of freshwater fishes caught in the Salto Santiago Reservoir, Iguacu River Basin, Brazil. In nine species significant differences were found in the LWR between sexes. Average b-value for species with no differences between sexes in LWR was 3.12 (SE = ±0.05). Average b-value in LLR was 0.823. First references on LWRs and L50 are presented for 13 and four fish species, respectively, as well as the new maximum total lengths for eight species.
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