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aqua 9(4)_Kuril Islands

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Volume 9, Issue 4 – April 2005

Alexei M. Orlov: Bottom trawl-caught fishes and some features of their vertical distribution in the Pacific waters off the north Kuril Islands and south-east Kamchatka, 1993-1999, pp. 139-160

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SINGLE PAPER

Volume 9, Issue 4 – April 2005

Alexei M. Orlov: Bottom trawl-caught fishes and some features of their vertical distribution in the Pacific waters off the north Kuril Islands and south-east Kamchatka, 1993-1999, pp. 139-160

Abstract
The species composition of demersal fishes in Pacific waters off the north Kuril Islands and south-east Kamchatka is considered. The study is based on 1275 demersal trawls carried out from 1993 to 1999 at depths between 76 and 833 m.
The fishes identified in this study included 153 species, 97 genera, and 41 families; 62.1 % of the total were from the following families: snailfishes (Liparidae); sculpins (Cottidae); righteye flounders (Pleuronectidae); skates (Rajidae); eelpouts (Zoarcidae); rockfishes (Sebastidae) and poachers (Agonidae). The relative abundances of the 153 species collected were categorised as: Very rare: 79; Rare: 30; Common: 24; and Abundant: 20. Most species found off the north Kuril Islands and south-east Kamchatka were also common in the Sea of Okhotsk (74.5 %) and the western Bering Sea (80.4 %).
The collected demersal fish species comprised: anadromous (1), neritic (3), mesopelagic (26), middle shelf (18), outer shelf (18), mesobenthic (62), and bathybenthic (25). Of the middle shelf species, the most abundant were northern rock sole Lepidopsetta polyxystra and Atka mackerel Pleurogrammus monopterygius. Atka mackerel Pleurogrammus monopterygius was also the most abundant fish in the outer shelf group. The mesobenthic fish fauna was dominated by the Alaska pollock Theragra chalcogramma, Pacific ocean perch Sebastes alutus, Atka mackerel Pleurogrammus monopterygius, and the northern rock sole, Lepidopsetta polyxystra. The most abundant bathybenthic fishes were the giant grenadier Albatrossia pectoralis, popeye grenadier Coryphae-noides cinereus, broadbanded thornyhead Sebastolobus macrochir, darkfin sculpin Malacocottus zonurus, and dimdisc snailfish Elassodiscus tremebundus.

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