Update the standardized catch rates of sailfish (Istiophorus albicans) caught as bycatch of the Spanish surface longline fishery targeting swordfish (Xiphias gladius) in the Atlantic Ocean
[EN] Standardized catch rates of sailfish (Istiophorus albicans) were obtained from 14,473 trip observations of surface longline fishing targeting swordfish during the period 2001-2019. The nominal effort modelled represented 80.65% of the total effort developed by this fleet during that period. In...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/350484 |
| Acceso en línea: | http://hdl.handle.net/10261/350484 |
| Access Level: | acceso abierto |
| Palabra clave: | Sailfish catch rates abundance GLM |
| Sumario: | [EN] Standardized catch rates of sailfish (Istiophorus albicans) were obtained from 14,473 trip observations of surface longline fishing targeting swordfish during the period 2001-2019. The nominal effort modelled represented 80.65% of the total effort developed by this fleet during that period. In roughly 28% of these trips at least one individual belonging to this species was found. Because of the low prevalence of this species in this fishery, the standardized CPUE was developed using a Generalized Linear Mixed Model assuming a delta-lognormal error distribution. The results indicate that the overall trend of the standardized CPUE was similar for the Atlantic Ocean and for the East and West stocks. The results showed an increasing trend for the Atlantic Ocean and for the East and West stock reaching a peak in 2015 or 2013, followed by a decreasing trend in the recent years analyzed, although the values remained higher than at the beginning of the series. |
|---|