Ehrhardt, N.M.; Ercoli, R.; Garcia, J.C.; Bartozzetti, J.D.; Izzo, A. 1996. Influencia de la cantidad de captura en la selectividad de mallas diamante y cuadrada en redes de arrastre para la merluza común (Merluccius hubbsi) e implicancias sobre el potencial de descarte. Rev. Invest. Desarr. Pesq., 10: 31-43. Ver texto completo
The hake, Merluccius hubbsi, fishery is the most important amongst the argentinean demersal fisheries. Fishery management schemes have been adopted to control high discard levels of undersized fish historically observed in the fishery. Controls have consisted in establishing closed areas to fishing and implementation of minimum mesh size in bottom trawls to allow escapement of fish less than 33 cm in length. Offical fishery regulations establish a 120 mm inside codend mesh size in all hake traws. This work reports on the dynamics of hake selection in bottom trawls as a function of the relative abundance of the resource as well as loading levels imposed on the fishing gear. The analyses include the response to selection by square mesh panels attached to codends. This study concludes that selectivity in 120 mm diamond mesh size codends did not meet expected escapement levels, while selection of square mesh panels was practicaly nil, most likely due to its relatively forward positioning in the codend. Reduced selectivity may be an important factor that may be seriously affecting the status of exploitation of hake stocks.