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aqua 6(1)_Sebastes

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Volume 6, Issue 1 – October 2002

Alexei M. Orlov: Summer diet and feeding of shortraker (Sebastes borealis) and rougheye (S. aleutianus) rockfishes (Scorpaenidae) in the western Bering Sea, pp. 29-38

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SINGLE PAPER

Volume 6, Issue 1 – October 2002

Alexei M. Orlov: Summer diet and feeding of shortraker (Sebastes borealis) and rougheye (S. aleutianus) rockfishes (Scorpaenidae) in the western Bering Sea, pp. 29-38

Abstract

Shortraker rockfish Sebastes borealis and rougheye rockfish S. aleutianus are important fishery targets in the North Pacific. Whilst their biology has been extensively studied, the feeding habits of these fish have only been reported from Alaskan waters. This present study was conducted on fish caught in the western Bering Sea. Bottom trawls were made around the clock in the summer of 1997. Random samples of rockfish were taken and examined for stomach contents. Of the 389 shortraker rockfish and 72 rougheye rockfish stomachs examined, 105 of the former and 12 of the latter contained food. The diet of the shortraker rockfish consisted of a variety of marine organisms from small crustaceans to fishes. The most important dietary components were the red squid Berryteuthis magister and a number of fish species which included the Pacific herring, Clupea pallasii, and some mesopelagic myctophids, bathylagids and a number of unidentified species. The diet of rougheye rockfish consisted of mysids, amphipods, pandalid shrimps, Tanner crabs, mesopelagic myctophids and bathylagids and some other unidentified organisms. The compositions of the diets of rockfish from the Alaskan waters and from the Bering Sea were compared, and dietary differences observed in larger fish and between the sexes were also analysed.

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