Spatial dynamics of juvenile anchovy in the Bay of Biscay

Handle URI:
http://hdl.handle.net/10754/621784
Title:
Spatial dynamics of juvenile anchovy in the Bay of Biscay
Authors:
Boyra, Guillermo; Peña, Marian; Cotano, Unai; Irigoien, Xabier ( 0000-0002-5411-6741 ) ; Rubio, Anna; Nogueira, Enrique
Abstract:
In autumn 2009, the implementation of two successive acoustic surveys targeting juvenile anchovy (Engraulis encrasicolus) in the Bay of Biscay allowed us to monitor the changes in the spatial distribution and aggregation patterns of juveniles of this species during 45 days under fairly stable meteorological conditions. Juvenile anchovy changed its biological condition and behavior in a different manner in two distinct areas. In the Spanish sector, the juveniles migrated 20 nautical miles (n.mi.) towards the coast, but they remained on the shelf and near the surface during the whole surveyed period. As the advance towards the shelf break progressed, their area of distribution decreased, their density increased and the juveniles spread in fewer but heavier shoals. In the French sector, the juveniles also migrated from slope waters towards the coast at a similar velocity, but they crossed the shelf break into the continental shelf, where they increased their mean depth significantly until gradually adopting the typical nyctemeral migrations of adult anchovy. The mean length of the juveniles that adopted the nyctemeral migrations was significantly higher than that of the juveniles remaining at the surface, suggesting that body size is relevant to accomplish this change. Besides, the stronger temperature gradients between the shelf and oceanic waters in the Spanish sector, favored by a narrow shelf, may have acted as a barrier influencing the distinct observed spatial patterns in the two areas. © 2016 John Wiley & Sons Ltd
KAUST Department:
Red Sea Research Center (RSRC)
Citation:
Boyra G, Peña M, Cotano U, Irigoien X, Rubio A, et al. (2016) Spatial dynamics of juvenile anchovy in the Bay of Biscay. Fisheries Oceanography 25: 529–543. Available: http://dx.doi.org/10.1111/fog.12170.
Publisher:
Wiley-Blackwell
Journal:
Fisheries Oceanography
Issue Date:
8-Jul-2016
DOI:
10.1111/fog.12170
Type:
Article
ISSN:
1054-6006
Sponsors:
Eusko Jaurlaritza; “Viceconsejería de Agricultura, Pesca y Politicas Alimentarias - Departamento de Desarrollo Económico y Competitividad”; “Secretaría General de Pesca, Ministerio de Agricultura, Alimentación y Medio Ambiente”; Spanish Government; Instituto Español de Oceanografía
Appears in Collections:
Articles; Red Sea Research Center (RSRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorBoyra, Guillermoen
dc.contributor.authorPeña, Marianen
dc.contributor.authorCotano, Unaien
dc.contributor.authorIrigoien, Xabieren
dc.contributor.authorRubio, Annaen
dc.contributor.authorNogueira, Enriqueen
dc.date.accessioned2016-11-03T13:24:54Z-
dc.date.available2016-11-03T13:24:54Z-
dc.date.issued2016-07-08en
dc.identifier.citationBoyra G, Peña M, Cotano U, Irigoien X, Rubio A, et al. (2016) Spatial dynamics of juvenile anchovy in the Bay of Biscay. Fisheries Oceanography 25: 529–543. Available: http://dx.doi.org/10.1111/fog.12170.en
dc.identifier.issn1054-6006en
dc.identifier.doi10.1111/fog.12170en
dc.identifier.urihttp://hdl.handle.net/10754/621784-
dc.description.abstractIn autumn 2009, the implementation of two successive acoustic surveys targeting juvenile anchovy (Engraulis encrasicolus) in the Bay of Biscay allowed us to monitor the changes in the spatial distribution and aggregation patterns of juveniles of this species during 45 days under fairly stable meteorological conditions. Juvenile anchovy changed its biological condition and behavior in a different manner in two distinct areas. In the Spanish sector, the juveniles migrated 20 nautical miles (n.mi.) towards the coast, but they remained on the shelf and near the surface during the whole surveyed period. As the advance towards the shelf break progressed, their area of distribution decreased, their density increased and the juveniles spread in fewer but heavier shoals. In the French sector, the juveniles also migrated from slope waters towards the coast at a similar velocity, but they crossed the shelf break into the continental shelf, where they increased their mean depth significantly until gradually adopting the typical nyctemeral migrations of adult anchovy. The mean length of the juveniles that adopted the nyctemeral migrations was significantly higher than that of the juveniles remaining at the surface, suggesting that body size is relevant to accomplish this change. Besides, the stronger temperature gradients between the shelf and oceanic waters in the Spanish sector, favored by a narrow shelf, may have acted as a barrier influencing the distinct observed spatial patterns in the two areas. © 2016 John Wiley & Sons Ltden
dc.description.sponsorshipEusko Jaurlaritzaen
dc.description.sponsorship“Viceconsejería de Agricultura, Pesca y Politicas Alimentarias - Departamento de Desarrollo Económico y Competitividad”en
dc.description.sponsorship“Secretaría General de Pesca, Ministerio de Agricultura, Alimentación y Medio Ambiente”en
dc.description.sponsorshipSpanish Governmenten
dc.description.sponsorshipInstituto Español de Oceanografíaen
dc.publisherWiley-Blackwellen
dc.subjectAnchovyen
dc.titleSpatial dynamics of juvenile anchovy in the Bay of Biscayen
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.identifier.journalFisheries Oceanographyen
dc.contributor.institutionAZTI; Instituto Tecnológico Pesquero y Alimentario; 20110 Pasaia Spainen
dc.contributor.institutionCentro Oceanográfico de Baleares; Instituto Español de Oceanografía; 07015 Palma de Mallorca Spainen
dc.contributor.institutionCentro Oceanográfico de Gijón; Instituto Español de Oceanografía; 33212 Gijón Spainen
kaust.authorIrigoien, Xabieren
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