Data/hora: 10/06/2024 09:59:54

Provedor de dados: | 5
País: | France
Título: | Biological reference points and natural long-term fluctuations: the case of eastern Atlantic bluefin tuna
Autores: | Fromentin, Jean-marc; Fonteneau, Alain; Farrugio, Henri.
Data: | 2000
Ano: | 2000
Resumo: | Defining biological key reference points is of importance within the precautionary approach. Most of the reference points, such as the FMSY, Fo.], presuppose a steady state, i.e. the natural long-term fluctuations of the population are low or moderate. In this manuscript, we present historical data from Sicilian, Sardinian, Portuguese, and Tunisian traps of the Atlantic bluefin tuna during 200 to 400 years. Long-term fluctuations in trap data could be considered as a good proxy for long-term trend in true abundance because trap is a passive gear which was submitted to low modification until the XX century and because data from different areas display similar long-term variations. Trends in trap data appear beIl shaped, with a maximum at the end ofthe XIXth century and two comparable minima at the beginning of the XIXth and XXth, respectively. There is a factor of about 4 between periods of low and high abundance. A longer series of catches going back to the 16th century show consistent long-term fluctuations all along the 400 years. These results would indicate that the Eastern Atlantic bluefin tuna, as some populations of Atlantic cod and herring, as weIl as the North Atlantic albacore, display large natural long-term fluctuations. Further researches need to be done in order to improve our understanding of the causes of this long-term variability. Because of this dynamics, the F MSy. FO.1 or other steady state points do not appear appropriate for the Eastern Atlantic bluefin tuna. Empirical and relative reference points related to the instantaneous biomass and/or exploitation rate need to be defined.
Tipo: | Text
Idioma: | Inglês
Identificador: | http://archimer.ifremer.fr/doc/00194/30485/28890.pdf
Editor: | ICCAT
Relação: | http://archimer.ifremer.fr/doc/00194/30485/
Formato: | application/pdf
Fonte: | Collective Volume of Scientific Papers (1021-5212) (ICCAT), 2000 , Vol. 51 , N. 6 , P. 2072-2083
Fonte: | ICCAT