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The spatio-temporal pattern of Argentine shortfin squid Illex argentinus abundance in the southwest Atlantic

Published online by Cambridge University Press:  23 December 2005

Mar Sacau ,
Graham J. Pierce ,
Jianjun Wang ,
Alexander I. Arkhipkin ,
Julio Portela ,
Paul Brickle ,
María B. Santos ,
Alain F. Zuur  and
Xosé Cardoso
Mar Sacau
Affiliation:
Instituto Español de Oceanografía, PO Box 1552, 36200 Vigo, Spain
Graham J. Pierce
Affiliation:
Department of Zoology, School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
Jianjun Wang
Affiliation:
Department of Zoology, School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
Alexander I. Arkhipkin
Affiliation:
Fisheries Department, Falkland Islands Government, PO Box 598, Stanley, Falkland Islands
Julio Portela
Affiliation:
Instituto Español de Oceanografía, PO Box 1552, 36200 Vigo, Spain
Paul Brickle
Affiliation:
Fisheries Department, Falkland Islands Government, PO Box 598, Stanley, Falkland Islands
María B. Santos
Affiliation:
Instituto Español de Oceanografía, PO Box 1552, 36200 Vigo, Spain Department of Zoology, School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
Alain F. Zuur
Affiliation:
Highland Statistics Ltd., 6 Laverock Road, Newburgh, Aberdeenshire, AB41 6FN, UK
Xosé Cardoso
Affiliation:
Instituto Español de Oceanografía, PO Box 1552, 36200 Vigo, Spain
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Abstract

The Argentine shortfin squid (Illex argentinus) is a common neritic species occurring in waters off Brazil, Uruguay, Argentina, and the Falkland/Malvinas Islands in the southwest Atlantic. Illex argentinus is the most important fished cephalopod species in the area and plays a significant role in the ecosystem. It is object of major fisheries using both trawlers (mostly from European countries) and jigging vessels (mainly from Asian countries) and estimated total annual average catch for the last 15 years (1988-2003) is about 700 000 tons. The present paper aims to develop predictive models of squid abundance in relation to physical and environmental conditions, models that could ultimately be applied to fishery forecasting. Fishery and biological data collected by scientific observers aboard commercial trawlers between 1988 and 2003 were analysed in relation to physical and environmental factors to establish the spatio-temporal pattern of the species' distribution and quantify the influence of environmental variables (e.g. SST, depth) on local abundance. The data included 26 168 fishing haul records, of which 11 103 were positive for Illex. CPUE (Catch Per Unit Effort, kg h−1) was used as abundance index. The analyses were based on time-series maps created using Geographical Information Systems (GIS). GIS maps showed that highest CPUE values were recorded during the first four months of the year (the Austral summer-autumn), with peak values higher than 5000 kg h−1 mainly located within 42° S, 46° S and MN (North part of Malvinas/Falkland) areas. Generalised additive models (GAMs) were used to describe variation in Illex argentinus abundance in relation to geographical and environmental variables. The presence/absence (PA) of Illex and its abundance (CPUE) in areas of presence were modelled separately. Predictors retained in the optimal models included SST, latitude, longitude, month, average fishing depth and year. Both models suggest a clear seasonal effect: maximum catchability was found during March (PA model) and the maximum abundances were found during the first quarter of the year (CPUE model). GAM models also demonstrated that higher catches and maturity of squid were related, in general terms, to warmer and deeper water.

Keywords

Argentine shortfin squidIllex argentinusGISGAMEnvironmentSpatio-temporal pattern
Type
Research Article
Information
Aquatic Living Resources , Volume 18 , Issue 4: Environmental Effects on Cephalopod Life History and Fisheries , October 2005 , pp. 361 - 372
Copyright
© EDP Sciences, IFREMER, IRD, 2005

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