Food and daily ration of the rock soleLepidopsetta bilineata (Pleuronectidae) in the eastern Bering Sea |
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| Authors: | F Corcobado Oñate |
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| Institution: | (1) Northwest and Alaska Fisheries Center, National Marine Fisheries Service, NOAA, 7600 Sand Point Way, NE Bin C15700, F/NWC2, 98115 Seattle, Washington, USA;(2) Present address: Centro Experimental de Villajuán, Consellería de Pesca, Apartado de Correos 208, E-36600 Villagarcía de Arosa, Pontevedra, Spain |
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| Abstract: | A total of 129 specimens ofLepidopsetta bilineata (Ayres) were collected in the eastern Bering Sea (57°02 –58°11N; 161°58–164°38W) between 28 August and 7 September 1984. Examination of its stomach and intestine contents revealed that polychaetes, gammarid amphipods and echiuroids constitute the bulk of its diet. Prey type is related to fish size. Juveniles consume more mobile prey, such as small crustaceans (gammarid amphipods, cumaceans, carideans), while adults, although still continuing to feed on gammarid amphipods, preferentially feed on infaunal organisms such as polychaetes, echiuroids and mollusks. Some prey, such as echinoderms, fishes and urochordates, were encountered only in stomachs, which resulted in a higher index of feeding diversity for this organ. Rock sole feeds primarily during daylight hours, peaking at dusk. Its daily ration was estimated as 0.49, 1.12, and 1.61% of fish body weight from contents of stomach, intestine, and stomach plus intestine, respectively. |
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