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Environmental and stock effects on recruitment variabilityin the English Channel squid Loligo forbesi

Published online by Cambridge University Press:  23 December 2005

Laurence Challier ,
Juliette Royer ,
Graham John Pierce ,
Nick Bailey ,
Beatriz Roel  and
Jean-Paul Robin
Laurence Challier
Affiliation:
Laboratoire de Biologie et Biotechnologies marines, Institut de Biologie Fondamentale et Appliquée, Université de Caen, esplanade de la Paix, 14032 Caen Cedex, France
Juliette Royer
Affiliation:
Laboratoire de Biologie et Biotechnologies marines, Institut de Biologie Fondamentale et Appliquée, Université de Caen, esplanade de la Paix, 14032 Caen Cedex, France
Graham John Pierce
Affiliation:
School of Biological Sciences (Zoology), University of Aberdeen, Tillydrone Avenue, Aberdeen AB24 2TZ, UK
Nick Bailey
Affiliation:
Fisheries Research Services, The Marine Laboratory, PO Box 101, Victoria Road, Aberdeen, AB11 9DB, UK
Beatriz Roel
Affiliation:
CEFAS, The Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory, Pakefield Road, Lowestoft, Suffolk NR33 0HT, UK
Jean-Paul Robin
Affiliation:
Laboratoire de Biologie et Biotechnologies marines, Institut de Biologie Fondamentale et Appliquée, Université de Caen, esplanade de la Paix, 14032 Caen Cedex, France
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Abstract

Recruitment variability is commonly attributed to variation in spawning stock size and environmental variability. Here, the abundance of Loligo forbesi in the English Channel was estimated using cohort analysis. Environmental and adult biomass effects on recruitment variation were then tested. A stochastic length-age key was included in the cohort analysis, considering inter-individual variability in age at length. The number of recruits and parental stock biomass per monthly age-class were computed for a series of 13 fishing seasons (1989-2002). Recruitment was examined in relation to adult biomass and environmental parameters (sea surface temperature, SST, and the North Atlantic Oscillation, NAO) at the time of hatching. Recruits were approximately 7 months old and recruitment for each annual cohort occurred between April and August. Squid bigger than the length at maturity were assumed to be spawners. In the spawning season (September December), spawners were 11–13 months old. Parametric stock-recruitment curves (Ricker, Beverton and Holt, Shepherd, etc.) fitted poorly, while SST was negatively correlated with recruitment in a simple linear model. Recruitment was unrelated to NAO. A model combining SST and adult biomass showed that recruitment is probably density-dependent when stock size is high, and negatively correlated with temperature. The study did not indicate obvious recruitment overfishing in the English Channel L. forbesi population.

Keywords

Stock-recruitmentEnvironmental factorTemperatureNAOCephalopod
Type
Research Article
Information
Aquatic Living Resources , Volume 18 , Issue 4: Environmental Effects on Cephalopod Life History and Fisheries , October 2005 , pp. 353 - 360
Copyright
© EDP Sciences, IFREMER, IRD, 2005

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