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Title: Modelling the spatio-temporal distribution of age-1 Bay of Biscay anchovy (Engraulis encrasicolus) at spawning time
Authors: Ibaibarriaga, Leire; Uriarte, Andres; Laconcha, Urtzi; Bernal, Miguel; Santos, Maria; Chifflet, Marina; Irigoien, Xabier
Citation: SCIENTIA MARINA, 2013, 77, 461-472
Abstract: To efficiently manage and maintain fish stock abundance and age structure, it is necessary to understand variability in its spatial distribution. The main objective of this study was to describe the demographic structure of the Bay of Biscay anchovy during the main spawning period based on adult samples from 15 daily egg production method surveys. The proportion of age-1 individuals was modelled using generalized additive models with a binomial distribution and a logit link in relation to geographical and environmental covariates. The possibility of obtaining different models depending on the average age-1 proportion (low or high) was also explored. In general, age-1 individuals were found in shallow waters close to the coast, especially associated with the Gironde and Adour river plumes, whereas older individuals were prevalent on the shelf break and in oceanic waters. However, in years with a high age-1 proportion the younger individuals were also dominant in oceanic waters. These results could be used for management purposes, such as defining protected areas for particular age groups.
Keywords: spatial age composition; anchovy; Bay of Biscay; daily egg production method; generalized additive model; environmental effects; COD GADUS-MORHUA; SMOOTHING PARAMETER-ESTIMATION; DAILY EGG-PRODUCTION; SPATIAL-DISTRIBUTION; MULTIMODEL APPROACH; SOUTHERN BENGUELA; RECRUITMENT; SARDINE; FISH; SIZE
Issue Date: 2013
Type: Article
Language: English
DOI: 10.3989/scimar.03851.05C
ISSN: 0214-8358
Funder: Department of Agriculture and Fisheries of the Basque Country Government
EU Project UNCOVER [022717]
Appears in Publication types:Artículos científicos

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