Geographic variability of sardine dynamics in the Iberian Biscay region

Type Article
Date 2009-04
Language English
Author(s) Silva A.1, Skagen D. W.2, Uriarte A.3, Masse Jacques4, Santos M. B.5, Marques V.1, Carrera P.6, Beillois Pierre4, Pestana G.1, Porteiro C.5, Stratoudakis Y.1
Affiliation(s) 1 : IPIMAR, Inst Nacl Recursos Biol, P-1449006 Lisbon, Portugal.
2 : Inst Marine Res, N-5817 Bergen, Norway.
3 : AZTI Tecnalia, Pasaia 20110, Spain.
4 : IFREMER, F-44311 Nantes 3, France.
5 : Ctr Oceanog Vigo, Inst Espanol Oceanog, Vigo 36280, Spain.
6 : Museo Mar Galicia, Vigo 36280, Spain.
Source ICES Journal of Marine Science (1054-3139) (Oxford university press), 2009-04 , Vol. 66 , N. 3 , P. 495-508
DOI 10.1093/icesjms/fsn225
WOS© Times Cited 27
Keyword(s) Stock structure, Small pelagic fish, Population dynamics, Iberian Peninsula
Abstract The spatio-temporal variability in the distribution, demographic structure, recruitment, and mortality of sardine within the Iberian Biscay region is described using area-disaggregated data collected during acoustic surveys and at ports since the mid-1980s. Multiple regression models were used to describe log numbers-at-age obtained annually in ten areas covered by three surveys to test the existence of geographic differences in selectivity-at-age, recruitment strength, and mortality and to infer plausible migration routes. Within Iberian waters, sardine biomass was mainly concentrated off western Portugal and the Gulf of Cadiz. In the Bay of Biscay, biomass levels were comparable with those off western Portugal. Recruitment was localized in a few areas (northern Portugal and the Gulf of Cadiz and Bay of Biscay), intermingling with areas dominated by older fish. Recruitment was generally asynchronous among areas, although some recruitment peaks were noticeable across wider regions. Spatial patterns related to strong and weak year classes and year-class slopes were also noted. Clearly distinct dynamics were not evidenced within the Atlanto-Iberian sardine stock area, but the validity of the northern limit was questioned by the connection between sardine dynamics in the Bay of Biscay and the Cantabrian Sea. The results provided some evidence consistent with the hypothesis of sardine movement from recruiting grounds to areas farther along the coast as they grow.
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Silva A., Skagen D. W., Uriarte A., Masse Jacques, Santos M. B., Marques V., Carrera P., Beillois Pierre, Pestana G., Porteiro C., Stratoudakis Y. (2009). Geographic variability of sardine dynamics in the Iberian Biscay region. ICES Journal of Marine Science, 66(3), 495-508. Publisher's official version : , Open Access version :