Nuevos registros de la distribución del bagre marino (Genidens Barbus) en la cuenca inferior del río negro; provincia de Río Negro, Argentina

Abstract

The marine catfish, Genidens barbus (Lacépède 1803), is an anadromous species of great commercial value. Studies conducted on this species indicate that its distribution is limited to estuaries in the coastal zone and on the maritime platform from Bahía (Brazil) to Bahía San Blás (Argentina). The objective of this work is to confirm the current distribution of sea catfish, in the lower basin of the rio Negro, province of Río Negro and to provide information regarding the physiological situation of the species in the study región. . The samplings were made during the period between October 2017 and March 2018, 112 specimens of G. barbus were captured, with sizes between 277 mm and 530 mm of total length, with males prevailing by 98 %. The species was recorded from the El Cóndor Beach to the town of Guardia Mitre inclusive. None of the specimens showed evidence of migrating for reproductive purposes.