Resumen

MARZUOLI, Juan Octavio et al. New sites and hypotheses about the dorado Salminus brasiliensis dispersal routes in Córdoba Province (Argentina). Rev. Mus. Argent. Cienc. Nat. [online]. 2023, vol.25, n.2, pp.297-308. ISSN 1853-0400.  http://dx.doi.org/10.22179/revmacn.25.806.

The dorado (Salminus brasiliensis) has a relevant value for recreational fish ing in Argentina. In Córdoba province its presence has been reported in a limited number of aquatic environ ments, most of them belonging to la Plata River Basin. By 2016, in accordance with extraordinary floods, numer ous specimens were captured in the center-south region of Córdoba. The objective of this research is to report new occurrence localities, discuss the possible entry routes and describe water characteristics of the site with the highest abundance of fish recorded. Information about capture sites was collected for the period 2016-2020. Ichthyological surveys were carried out and parameters related to water quality were obtained in a shallow lake. Eight specimens were taxonomically studied presenting standard lengths between 235 and 323 mm and weights between 199 and 640 g. A total of 27 occurrence sites were recorded in the study area, of which 22 correspond to localities where their presence had not been reported before. The presence of S. brasiliensis in the region, and in these new sites could obey to episodical entrances with a synchronous condition of hydrological excess. This situation would be further enhanced by the current hydrological connectivity generated by artificial waterways in the region.

Palabras clave : Fish; Ecology; Salminus brasiliensis; Argentina; Distribution; Córdoba.

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