SUMMARY
Swordfish (Xiphias gladius) catch and effort data collected from the US Pelagic longline fleet operating in the western north Atlantic were used to update indices of abundance for the north Atlantic swordfish stock. Standardized catch rates were estimated using a Generalized Linear Mixed modeling ap...
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.494.3259 http://www.iccat.int/documents/cvsp/cv056_2004/no_3/cv056030947.pdf |
| Summary: | Swordfish (Xiphias gladius) catch and effort data collected from the US Pelagic longline fleet operating in the western north Atlantic were used to update indices of abundance for the north Atlantic swordfish stock. Standardized catch rates were estimated using a Generalized Linear Mixed modeling approach assuming a delta-lognormal error distribution. Indices of abundance in units of biomass (dressed weight) were estimated for fish greater than 33 lbs due to U.S. size restrictions implemented in 1991. For comparison, indices of abundance in numbers of fish for ages 3-10+ combined sexes were estimated. The age-sex slicing algorithms used were the size at age by sex relationships employed during the 1999 swordfish stock assessment. The explanatory variables considered for standardization included geographical area, seasonal trimesters, fishing target species, and a fixed factor operational procedure (OP) that classifies the U.S. longline fishing fleet according to boat and fishing gear characteristics, and fishing styles. RÉSUMÉ Les données de prise et d’effort de l’espadon (Xiphias gladius) recueillies de la flottille palangrière pélagique des Etats-Unis qui opère dans l’Atlantique nord-ouest ont été utilisées |
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