Standardized catch rates in biomass for the blue shark (Prionace glauca) caught by the Spanish longline fleet in the south Atlantic during the period 1997-2013
Standardized catch rates per unit of effort (CPUE) were obtained for the stock of the South Atlantic blue shark (Prionace glauca) using General Lineal Models (GLM) for a total of 4027 trips of the Spanish surface longline fleet targeting swordfish, during the 1997-2013 period. The main factors consi...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2016 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/322458 |
| Acceso en línea: | http://hdl.handle.net/10261/322458 |
| Access Level: | acceso abierto |
| Palabra clave: | Centro Oceanográfico de A Coruña blue shark Pesquerías sharks CPUE GLM Spanish fleet |
| Sumario: | Standardized catch rates per unit of effort (CPUE) were obtained for the stock of the South Atlantic blue shark (Prionace glauca) using General Lineal Models (GLM) for a total of 4027 trips of the Spanish surface longline fleet targeting swordfish, during the 1997-2013 period. The main factors considered were year, area, quarter, gear and ratio between swordfish and blue shark catches. The significant model explained the 87% of CPUE variability in blue shark. A major part of this variability was explained by the targeting criteria and the gear style. Other factors were also significant, but less important. The standardized CPUE obtained suggests a stable trend of the South Atlantic blue shark stock and differs substantially from the nominal CPUE trends observed during the period considered |
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