Abstract

ARRIETA-ATENCIO, Jesús; ZUNIGA, Harley  and  ALTAMAR, Jaira. Gillnet selectivity for catching bocachico (Prochilodus magdalenae, Prochilodontidae) In Zarate Swamp. Acta biol.Colomb. [online]. 2022, vol.27, n.1, pp.44-51.  Epub Feb 07, 2022. ISSN 0120-548X.  https://doi.org/10.15446/abc.v27n1.88168.

Accurate estimation of gillnet selectivity curves in a fish population is an important requirement for the sustainability of exploited stocks. However, selectivity studies for fishing gear operating in Colombia's inland ecosystems is very rare. This study determined the gillnet selectivity parameters used in the catch of the bocachico (Prochilodus magdalenae). The experimental design evaluated three mesh sizes (5.72, 6.35 and 8.89 cm) and the catches were made in different fishing sites at the Zárate swamp. With the use of the SELECT method, the selectivity parameters were estimated and the Kruskall Wallis test determined the differences in the catch per unit effort. Furthermore, the optimal mesh size was calculated from Baranov's principle of geometric similarity. The results show that the normal model (scale) presented the best fit for the catch of bocachico. The modal lengths calculated with the normal scale model were 22.90, 25.45, and 35.63 cm for mesh sizes of 5.72, 6.35, and 8.89 cm, respectively. The calculated optimal mesh size was 6.99 cm. The results indicate that nets with mesh sizes of 5.72 cm and lower influences the size structure of the bocachico. These nets need to be prioritized in the formulation of management measures based on the regulation of this fishing gear, which will allow the sustainability of the fishery.

Keywords : Catch per unit effort; Colombia; artisanal fisheries; catch size; overfishing.

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