Data/hora: 14/06/2024 16:41:31

Provedor de dados: | 5
País: | France
Título: | Rendements de la pêche sardinière (Sardina pilchardus) et conditions de vent, dans le nord du golfe de Gascogne
Autores: | Littaye-mariette, Anne.
Data: | 1990
Ano: | 1990
Palavras-chave: | Pêche Sardina pilchardus; Disponi bilité; Vent; Circulation résiduelle; Golfe de Gascogne.; Sardine fishery; Sardina pilclwrdus; Availa bi lity; Wind-spccd; Rcsidual circulation; Bay of Biscay.
Resumo: | In the northern Bay of Biscay (France), catches of Atlantic sardine (Sardina pilchardus, Walbaum) fluctuated widely at a time-scale of a few days until the end of the fishery in 1970. These variations were not syndhronous between the adjacent Douarnenez, Audierne and Concarneau Bays in southwest Brittany, or between Belle-Ile, Quiberon and Le Croisic or the fishing harbours of Les Sables d'Olonne and Saint-Gilles-Croix-de-Vie further south. Wind speed effects on hydrology and circulation also varied between these areas. Significant relationships between wind speed from one specific component or an index composed with the tide range and the wind speed and catches per unit of effort or CPUE were obtained from regression analyses for all areas except Audierne where hydrodynamics are more complex. In general, CPUE increased with wind speed up to about 5-6 m.s-1 and decreased afterwards. This wind speed has also been associated with thermal stability of the water column and optimal phytoplankton growth. The turbulent mixing induce by a strong wind, above 7 m.s-1, destroys the physical stucture and limits the phytoplanktonic biomass. On the contrary, the lack of it, when wind speed is low, with summertime solar heating, get the vertical thermal gradient strenghtened and get the nutrients renewal limited in the euphotic layer. The non linearity of the observed relationships fishing/wind is explained by these boundary factors. The site-specific relationships between CPUE and one particular wind component agrees well with the local residual circulation patterns and the associated horizontal and vertical fluctuations in thermal horizontal and vertical structure. Variations in both wind speed and directions explained from 44 % to 76 % of the variability of the sardine catches at a scale of a few days. The index composed of the tide range and the wind speed was associated with between 25 to 38 % of the variability. These relationships could result from the high sensitivity of sardine to its fluctuating environment. They illustrate how unpredictable environmental variations can modulate the fate of commercial fisheries.
Tipo: | Text
Idioma: | Francês

Identificador:

https://archimer.ifremer.fr/doc/00584/69640/67509.pdf

https://archimer.ifremer.fr/doc/00584/69640/

Editor: | CDR Centrale des revues
Formato: | application/pdf
Fonte: | Aquatic Living Resources (0990-7440) (CDR Centrale des revues), 1990 , Vol. 3 , P. 163-180

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