Caracterización de la zona de “El Rincón” (Provincia de Buenos Aires) como área de reproducción de peces costeros
2012; Volume: 21; Linguagem: Inglês
ISSN
2683-7595
AutoresMarcelo Acha, Marta Orduna, Karina A. Rodrígues, María Inés Militelli, Mara Braverman,
Tópico(s)Marine and fisheries research
ResumoIn order to characterize the “El Rincon” spawning ground, adult fishes were caught with a bottom trawl net and ichthyoplankton samples obtained with a Nackthai net. Salinity and temperature were measured with a CTD. Samples and measurements were performed during the EH-03/08 scientific cruise carried out in November 2008. The region is characterized by the presence of an oceanographic front formed by waters diluted by the discharges of the Negro and Colorado rivers, high salinity waters originated in the San Matias Gulf and intermediate salinity continental shelf waters. The eggs and/or larvae identified corresponded to Argentine anchovy, Brazilian flathead, Argentine seabass, red porgy, leatherjack, butterfish, flatfish and sciaenids and gravid females of stripped weakfish, red progy, Brazilian flat-head, Argentine sandperch, Argentine seabass, leatherjack, flatfish, Atlantic searobin, Brazilian sandperch, red mullet, cocherito and midshipman. The results obtained and the information published allow to suggest that the settlement of a multispecific spawning ground in the area is due to the existence of a recirculation cell that would favour retention of eggs and larvae in the area, to the abundance of zooplankton components that serve as food for larvae and to the closeness of a juvenile nursery ground in the saltmarshes and tidal creeks zone that extends from Bahia Blanca to the Negro river mouth.
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