Abstract: This paper reports the presence and feeding activity of fin whales (Balaenoptera physalus) during the austral summers of 2004 and 2005 in coastal waters near the Reserva Nacional Pinguino de Humboldt, north of Chile. The main prey item of the species was identified as the euphausiid Euphausia mucronata. The presence of B. physalus is associated with a high concentration of potential prey probably produced by an upwelling system that is frequently detected slightly south of the study area during summer. This information is a contribution to the knowledge of distribution, feeding behavior, and diet of B. physalus. Additionally, it constitutes the first record of a direct observation of feeding activity of B. physalus along the Chilean coast.

Key Words: Fin whale, Balaenoptera physalus, Euphausia mucronata, feeding activity, Chile

Document Type: Research article

DOI: 10.1578/AM.32.1.2006.109

Page Numbers: 109-113

$12.00 each Vol. 32, Iss. 1, Perez