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ISSN: 0018-8166 Print
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DOI: 10.1615/HydrobJ.v40.i2
Pages: 124
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DOI: 10.1615/HydrobJ.v40.i2.120
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Article price - $45.00 |
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Trophic Interrelations in Predatory Fishes of Pacific Waters Circumambient the Northern Kuril Islands and Southeastern Kamchatka
A. M. Orlov
All-Russian Research Institute of Fisheries and Oceanography, Moscow, Russia
ABSTRACT
Based on the materials collected during the field expeditions in 1992−1996, the diets of 12 predatory and 2 predatory-like fish species from the Pacific waters of the northern Kuril Islands and southeastern Kamchatka have been considered. Some aspects of their trophic relations have been analyzed. Based on comparisons of dietary overlap indexes (DOI) and taking into account annual dynamics of feeding intensity and spatial distribution of the species considered, the level of interspecific feeding competition of 17 pairs of predatory fishes having most similar rations has been estimated. The highest competition has been recorded for the following fish pairs: Sebastes borealis and Sebastolobus macrochir, and Bathyraja aleutica and B. maculata. Other species demonstrated low competition due to different levels of their ration mismatching, dynamics of feeding activity, and patterns of spatial distribution.
pages 19
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