IIMYC   23581
INSTITUTO DE INVESTIGACIONES MARINAS Y COSTERAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Biological aspects of the Broadnose Skate Bathyraja brachyurops from the Argentinean continental shelf
Autor/es:
BELLEGGIA MAURO; IBAÑEZ PEDRO; FIGUEROA DANIEL E.
Lugar:
Austin, TX
Reunión:
Congreso; Joint Meeting of Ichthyologists and Herpetologists (JMIH); 2017
Institución organizadora:
American Elasmobranch Society (AES), American Society of Ichthyologist and Herpertologists (ASIH)
Resumen:
The purpose of this study was to investigate the diet, the reproduction and the dynamics of the broadnose skate Bathyraja brachyurops from the southwestern Atlantic Ocean, based on a comprehensive dataset obtained from 1999 to 2012. A total of 1.757 skates were caught, measured to the nearest mm, weigthed, sexed and maturity stage determined. Food habits were studied based on analysis of stomach contents from a subsample of 344 specimens, from which 290 (84.3%) contained food. The diet consisted in fish on the north and crustaceans in the southern region. We found that the length at which 50% of skates are mature (LT50) differed between sexes, region and periods. The LT50 were estimated to be 707 mm for females, and 683 mm for males. The LT50 for males decreased from 697 mm to 673 mm from 1999-2006 to 2007-2012 in the northern region, whereas the LT50 for females decreased from 750 mm to 688 mm from 1999-2006 to 2007-2012. In the southern region, the LT50 for males decreased from 675 mm to 623 mm from 1999-2006 to 2007-2012, whereas the LT50 for females decreased from 711 mm to 636 mm from 1999-2006 to 2007-2012. Females with egg capsules were found between 70 and 208 m depth. Skates catch data from research vessels were interpolated and plotted to show the dynamics of this species in the Southwestern Atlantic from 1999 to 2012 and the effects of a permanent closed area for fisheries.