• Abstract

    Comparison of biometric factors of the invasive species Plagioscion squamosissimus (Heckel, 1840) in four reservoirs of the Paranapanema River, upper Paraná, Brazil

    Published date: 26/02/2026

    The Paranapanema River is an important tributary of the upper Paraná basin. Impacted by eleven hydroelectric dams, the Paranapanema River basin is highly fragmented and suffers from the presence of more than 60 invasive fish species. We compared the measurements of standard length (Ls), total weight (Wt) and relative condition factor (Kn) of individuals of Plagioscion squamosissimus, one of the invasive species with the greatest influence on the basin, in four different reservoirs. In our results, the length and weight of the croakers varied significantly among all reservoirs, in contrast to the relative condition factor, which remained statistically similar among all reservoirs, with values ​​greater than 1. Our results demonstrate that P. squamossimus presents different responses to the different specific characteristics of each reservoir, maintaining high health and demonstrating great plasticity in its adaptation to each environment.

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