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ICES Journal of Marine Science: Journal du Conseil 2006 63(4):714-724; doi:10.1016/j.icesjms.2006.01.002
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© 2006 International Council for the Exploration of the Sea

Larval distribution and growth of the rockfish, Sebastes capensis (Sebastidae, Pisces), in the fjords of southern Chile

Mauricio F. Landaeta* and Leonardo R. Castro

Laboratorio de Oceanografía Pesquera y Ecología Larval (LOPEL), Departamento de Oceanografía, Universidad de Concepción Casilla 160-C, Correo 3, Concepción, Chile

*Correspondence to M. F. Landaeta: tel: +56 041 207029; fax: +56 041 256571. e-mail: mlandaeta{at}udec.cl.

The distribution and the growth of larval rockfish Sebastes capensis were studied during two oceanographic cruises carried out in a sector of the Chilean fjords (43°30'S–46°S) during spring 2002 (November) and winter 2003 (August). Abundance (up to 600 per 10 m2) of pre- and post-flexion larvae was higher during the austral spring than in winter (20 per 10 m2). Larvae were smaller principally above the halocline in the first 50 m of the water column throughout the channels and fjords; in contrast, post-flexion larvae were more abundant seawards and were totally absent in the freshest waters. Analysis of the otoliths indicated that larvae between 3.3 and 12.2-mm standard length collected during November grew 0.15 mm d–1. Additionally, it showed that older larvae from the outer part of the channels and over the shelf laid down wider otolith increments than larvae found in the interior waters, coinciding with the area of greatest abundance of larger calanoid copepods. Ontogenetic differences in distributions suggest that different habitats are utilized during the early life stages of S. capensis, and that they seem to be shared with several other Sebastes species. However, the mechanisms for transport in different areas vary widely, making the question of the evolutionary forces driving these ontogenetic changes in distribution even more intriguing.

Keywords: larval growth, otolith, Patagonian fjords, rockfish, Sebastes capensis, southern Chile

Received 8 April 2005; accepted 23 January 2006.


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