Novel Tools to Reduce Seabird Bycatch in Coastal Gillnet Fisheries

摘要: : We examined several strategies to reduce seabird bycatch, primarily of Common Murres (Uria aalge) and Rhinoceros Auklets (Cerorhinca monocerata), in a coastal salmon drift gillnet fishery Puget Sound, Washington, U.S.A. Our goal was significantly bycatch without concomitant reduction target catch or an increase the any other species. compared fish nets modified include visual alerts (highly visible netting upper net) acoustic (pingers) traditional monofilament set throughout normal fishing hours over 5-week season. Catch varied as function gear. Relative controls, murres responded both alerts; auklets sockeye deeper only. Seabird abundance across multiple temporal scales: interannually, within season, day. At interannual level, entanglement linked regional on grounds, pattern that broke down at local level. Within murre were negatively correlated, suggesting if openings scheduled peak species, would be reduced increased efficiency. Finally, auklet highest dawn, whereas high dawn dusk. results identify three complementary tools Sound fishery—gear modifications, abundance-based openings, time-of-day restrictions—for possible up 70–75% significant Although these are based conditions will thus vary among years locations, all might exportable fisheries worldwide. Resumen: Examinamos diversas estrategias para reducir la captura accidental de aves marinas, principalmente Uria aalge y Cerorhinca monocerata en redes agalleras deriva una pesqueria costera salmones Washington (USA). Nuestra meta fue significativamente marinas sin reduccion concomitante o un incremento cualquier otra especie. Comparamos peces capturados capturadas accidentalmente modificadas incluir alertas visuales (red altamente parte superior) acusticas contra monofilamento tradicionales establecidas lo largo las horas normales pesca durante temporada 5 semanas. La vario funcion del arte pesca. Con control respondio tanto como acusticas; mientras que respondieron unicamente profundas. abundancia multiples escalas temporales: Interanualmente, dentro el dia. A nivel interanual, enredo estuvo ligado los sitios pesca, patron se rompe local. Dentro estacion negativamente correlacionada, sugiriendo si apertura fuera programada pico especie interes, reduciria eficiencia interes. Finalmente, fueron mayores al amanecer, alto amanecer anochecer. Nuestros resultados identifican tres herramientas complementarias con Sound—modificaciones artes base abundancias restricciones hora diapara posible hasta significativa pesar estas estan basadas condiciones locales cambiaran entre anos localidades, todo puede ser extrapolable otras pesquerias mundial.