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ICES Journal of Marine Science: Journal du Conseil 2003 60(5):1003-1011; doi:10.1016/S1054-3139(03)00100-0
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Behaviour of the southern sea lion (Otaria flavescens) and consumption of the catch during purse-seining for jack mackerel (Trachurus symmetricus) off central Chile

L.A Hückstädt* and T Antezana

Departamento de Oceanografía, Universidad de Concepción PO Box 160-C, Concepcion, Chile

*Correspondence to L.A. Hückstädt; tel: +56 41 204345; fax: +56 41 256571. e-mail: lhuckst{at}udec.cl.

The fishery for jack mackerel (Trachurus symmetricus) off central Chile competes for the resource with southern sea lions (Otaria flavescens), and during purse-seining makes the fish more accessible to the pinnipeds. Interactions with sea lions were recorded during 31 purse-seine sets off central Chile during October 1999. The sea lion behaviour associated with the fishing operations was distinctive. Feeding, movement, predator avoidance, and resting displays were identified. The sea lions approached the purse-seiner as soon as net-setting began. The number of sea lions per set (0–50) was seemingly unaffected by school size of jack mackerel, number of purse-seiners on the fishing ground, whether fishing was by night or by day, the presence of killer whales, or the species being targeted. However, the number of sea lions at a purse-seine differed significantly between fishing grounds. Other effects of fishing operations on O. flavescens included incidental mortality and capture. The amount of fish consumed by the sea lions at a set was as much as 0.4% of the catch. The results of the interaction are documented and discussed in the light of likely interaction with the whole sea lion population, as well as the impact of the interaction on the fishery.

Keywords: behaviour, central Chile, Otaria flavescens, purse-seine fishery, Trachurus symmetricus

Received 18 July 2002; accepted 27 April 2003.


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