Geographical differences in the feeding patterns of red rockfish (Sebastes capensis) along South American coasts

Barrientos, Claudio A. and González, M. Teresa and Moreno, Carlos A. (2006) Geographical differences in the feeding patterns of red rockfish (Sebastes capensis) along South American coasts. Fishery Bulletin, 104(4), pp. 489-497.

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Abstract

Feeding habits and feeding strategy of red rockfish (Sebastes capensis) were studied from fish captured along most of the range of this species in coastal waters of South America. Stomach contents of 613 individuals, collected during 2003, were analyzed. Fish were obtained from six locations along the Chilean (23°S to 46°S) and Argentinian (43°S) coasts. The main prey items were Mysidacea (75.06% IRI), Osteichthyes (6.29% IRI),and Rhynchocinetes typus (6.03% IRI). Predator sex and size did not significantly affect the diet, but significant differences were found between locations. Four geographical areas, discriminated by prey occurrence and frequencies, were determined: three on the Pacific coast and one on the Atlantic coast. These areas correspond roughly with biogeographic zones described for the Chilean and southern Argentinian coasts. The feeding strategy index (FSI) indicated a specialized feeding strategy for S. capensis for most of its range. However, the FSI does not include the behaviour of a predator, and the FSI must be interpreted carefully for fishes like S. capensis that are passive ambush feeders. The abundance and availability of different prey may explain both the geographic differences in dietary composition and the specialized feeding strategy of S. capensis.

Item Type: Article
Title: Geographical differences in the feeding patterns of red rockfish (Sebastes capensis) along South American coasts
Personal Creator/Author:
CreatorsEmail
Barrientos, Claudio A.
González, M. Teresa
Moreno, Carlos A.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 104
Number: 4
Page Range: pp. 489-497
Date: 2006
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8942
Depositing User: Patti M. Marraro
Date Deposited: 27 Jun 2012 16:54
Last Modified: 27 Jun 2012 16:54
URI: http://aquaticcommons.org/id/eprint/8942

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