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Seasonal movements of veined squid Loligo forbesi in Scottish (UK) waters

Published online by Cambridge University Press:  10 July 2009

Mafalda Viana ,
Graham J. Pierce ,
Janine Illian ,
Colin D. MacLeod ,
Nick Bailey ,
Jianjun Wang  and
Lee C. Hastie
Mafalda Viana
Affiliation:
School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK University of Algarve, Faculdade de Ciências do Mar e Ambiente (FCMA), Campus de Gambelas, 8000-117 Faro, Portugal
Graham J. Pierce
Affiliation:
School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK Instituto Español de Oceanografia, Centro Oceanografico de Vigo, PO Box 1552, 36200 Vigo, Spain
Janine Illian
Affiliation:
School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK Centre for Research into Environmental and Ecological Modelling (CREEM), School of Mathematics and Statistics, University of St Andrews, The Observatory Buchanan Gardens, St Andrews, KY16 9LZ, UK
Colin D. MacLeod
Affiliation:
School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
Nick Bailey
Affiliation:
Fisheries Research Services Marine Laboratory, PO Box 101, Victoria Road, Aberdeen, AB11 9DB, UK
Jianjun Wang
Affiliation:
School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
Lee C. Hastie
Affiliation:
School of Biological Sciences, University of Aberdeen, Zoology Building, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
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Abstract

In order to protect and sustainably manage fishery resource species, it is essential to understand their movements and habitat use. To detect the hypothesised migration of maturing veined squid Loligo forbesi from the west coast of Scotland (UK) to the North Sea and identify possible inshore-offshore movements, we analysed seasonal, spatial and environmental patterns in abundance and size distribution, based on commercial fishery landings data and trawl survey data from Scottish coastal waters (International Council for the Exploration of the Sea, ICES areas IVa, IVb and VIa). A geographic information system (GIS) was used to build monthly contour maps of abundance. Generalised additive mixed models (GAMM) were used to quantify patterns in size distribution and abundance. In most years, there was no evidence of movement from the West to the East coast of Scotland. Evidence of inshore-offshore movements during the life-cycle of the cohort that recruits in autumn (winter breeders) was found instead. The winter breeding cohort appears to spawn in inshore waters and some evidence suggests that the spawning grounds of the summer breeders are also inshore. Across seasons, higher abundance of L. forbesi can generally be found in the north of Scotland at intermediate water depths and in warmer waters.

Keywords

Loligo forbesiTemporal and spatial distribution patternsMigrationLife cycle
Type
Research Article
Information
Aquatic Living Resources , Volume 22 , Issue 3 , July 2009 , pp. 291 - 305
Copyright
© EDP Sciences, IFREMER, IRD, 2009

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