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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on October 16, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp235
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© 2009 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

South American sea lion and spiny dogfish predation on artisanal catches of southern hake in fjords of Chilean Patagonia

Ana de la Torriente1, Renato A. Quiñones2,3, Diego A. Miranda-Urbina4 and Fidel Echevarría1,5

1 Departamento de Biología, Facultad de Ciencias del Mar, Universidad de Cádiz, Puerto Real 11510, Cádiz, Spain
2 Programa de Investigación Marina de Excelencia (PIMEX-Nueva Aldea), Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Casilla 160-C, Concepción, Chile
3 Centro de Investigación en Ecosistemas de la Patagonia (CIEP), Bilbao 449, Coyhaique, Chile
4 Instituto de Zoología, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
5 Centro Andaluz de Ciencia y Tecnología Marina (CACYTMAR), Universidad de Cádiz, Puerto Real 11510, Cádiz, Spain

Correspondence to R. A. Quiñones: tel: +56 41 22 07 428; fax: +56 41 22 07 254; e-mail: rquinone{at}udec.cl.

de la Torriente, A., Quiñones, R. A., Miranda-Urbina, D. A., and Echevarría, F. 2010. South American sea lion and spiny dogfish predation on artisanal catches of southern hake in fjords of Chilean Patagonia. – ICES Journal of Marine Science, 67: 000–000.

The South American sea lion (Otaria flavescens) is a pinniped known to interact with fisheries, potentially damaging gear and lowering catches. Predation by O. flavescens and spiny dogfish (Squalus acanthias) on artisanal southern hake (Merluccius australis) catches in fjords of Chilean Patagonia is estimated and compared. Observations were made in the Gulf of Ancud and Comau Fjord in southern Chile from October 2005 to September 2006. Losses of southern hake catches to O. flavescens predation were 1.6% of the total catch of the species, and to spiny dogfish predation were slightly higher, at 3.3%. The predation of both species on southern hake catches varied throughout the year, but was lower in summer. Both predators showed a preference for adult southern hake over juveniles. There was no significant relationship between predation on southern hake catches by the sea lion and the availability of adult and juvenile southern hake on longlines (AHCL). However, there was a significant relationship (p < 0.05) between AHCL and spiny dogfish predation. Most O. flavescens interaction events (81.4%) were during longline retrieval. Our results showed minimal interactions between O. flavescens and the artisanal southern hake fishery in the area, so with the present abundance of O. flavescens, there is no justification for reducing the sea lion population by hunting.

Keywords: artisanal fisheries, Chilean fjords, Merluccius australis, Otaria flavescens, Patagonia, southern hake, Squalus acanthias

Received 14 October 2008; accepted 18 August 2009.


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