Data/hora: 16/06/2024 10:17:08

Provedor de dados: | 5
País: | France
Título: | Estimates of selectivity for the east Atlantic and Mediterranean bluefin tuna from 1970 to 2009
Autores: | Fromentin, Jean-marc; Bonhommeau, Sylvain.
Data: | 2011
Ano: | 2011
Palavras-chave: | Gear selectivity; Stock assessment; Bluefin tuna.
Resumo: | This study aims at examining the selectivity patterns among gears and years of the fleets targeting bluefin tuna in the Northeast Atlantic and Mediterranean Sea between 1970 and 2009, using catch curve analyses. The main outputs may be summarized as follow: (i) the general pattern of selectivity has highly varied through time, moving from ages 1-3 to ages 10+ from the 1970s to the 2000s; (ii) this important temporal drift primarily resulted from changes in PS selectivity patterns; (iii) these drastic variations in selectivity among gears and years can affect simple indicators which do not incorporate such information; (iv) the catch-at-age (CAA) matrix seems to be impaired by several inconsistencies that affect primarily the partial CAA of the purse seiners in the 2000s, the longlines in 1982, 2007 and 2009 and, secondarily, the baitboats in 2000; and (v) selectivities at ages 9 and 10+ are quite different among gears and/or time which makes difficult the specifications of the terminal Fs (i.e., the F-ratios) in ADAPT-VPA when the ‘Plus’ Group is a 10+. As the selectivities at ages 14 and 15+ appear more similar and more stable, it could be sensitive to run ADAPT-VPA on a 15+ ’Plus’ Group rather than a 10+ one.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00192/30279/28747.pdf
Editor: | ICCAT
Relação: | http://archimer.ifremer.fr/doc/00192/30279/
Formato: | application/pdf
Fonte: | Collective Volume of Scientific Papers (1021-5212) (ICCAT), 2011 , Vol. 66 , N. 2 , P. 787-798
Fonte: | ICCAT