Data/hora: 14/06/2024 04:15:34

Provedor de dados: | 5
País: | France
Título: | Retrospective analysis of the bluefin tuna Nordic fisheries data
Autores: | Pusineri, Claire; Ravier, Christelle; Fromentin, Jean-marc.
Data: | 2002
Ano: | 2002
Resumo: | A retrospective analysis (1951-1979) was carried out on the bluefin tuna Nordic fisheries (Norway and Germany) length and weight data distributions and compared to those of Barbate trap (Gibraltar strait, Spain) to test further Tiews’ hypothesis about the disappearance of bluefin tuna in northern seas. The cohorts were identified from weight/length distributions and compared using multivariate analyses. The results showed: (i) a synchronous ageing in the 4 fisheries, (ii) similar dominant cohorts between South Norway and Barbate in the one hand (cohorts born from 1948 to 1952) and North Norway and Germany on the other hand (cohort born in 1945), (iii) a synchronous drop (or collapse) in the catches that occurred in 1963and (iv) significant correlation between yearly catches. These similarities tend to confirm that the Nordic and Gibraltar tuna are likely to belong to the same population. Moreover, the synchronous ageing in the bluefin tuna catches from the end of the 1950’s to the 1980’s supported Tiews' s hypothesis (1978), according to which the Nordic fisheries collapsed because of a lack of migrating mature tunas in the northern area.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00194/30500/28910.pdf
Editor: | ICCAT
Relação: | http://archimer.ifremer.fr/doc/00194/30500/
Formato: | application/pdf
Fonte: | Collective Volume of Scientific Papers (1021-5212) (ICCAT), 2002 , Vol. 54 , N. 2 , P. 517-526
Fonte: | ICCAT