Greenland turbot Reinhardtius hippoglossoides of the eastern Bering Sea and Aleutian Islands region

Alton, Miles S. and Bakkala, Richard G. and Walters, Gary E. and Munro, Peter T. (1998) Greenland turbot Reinhardtius hippoglossoides of the eastern Bering Sea and Aleutian Islands region. NOAA/National Marine Fisheries Service, (NOAA Technical Report NMFS, 71)

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Abstract

Greenland turbot (Reinhardtius hippoglossoides) is a commercially important flounder in both the North Atlantic and North Pacific Oceans. In the latter, its center of abundance is in the eastern Bering Sea and along the Aleutian Islands chain where its population is managed as a single stock. Harvest levels in this region of the North Pacific during the period 1970-81 were comparable with those in the northwest and northeast Atlantic, with annual average catches of 53,000 metric tons (t). However, the catch in 1984 dropped sharply to 23,100 t, in part because of reduced quotas arising from concern over continued poor recruitment and declining catch-per-unit-effort. Recruitment failure was manifested in 1) the sharp decline in the catch rate of young flsh in annual research trawl surveys on the continental shelf of the eastern Bering Sea and 2) an increasing proportion of older and larger fish in the commercial catch from the continental slope of both the eastern Bering Sea and Aleutian Islands. The cause ofthe decline in recruitment could not be clearly identifled. Greenland turbot of the Bering Sea-Aleutian Islands share certain distributional features with the North Atlantic form. There is an apparent bathymetric change in the size and age of fish, with younger animals occupying continental shelf depths and the older individuals residing at depths of the continental slope. At shallow depths the young are exposed to temperature fluctuations, whereas older animals along the slope are exposed to relatively stable temperatures. A hypothesis is proposed for describing the temporal and spatial paths by which young animals reach the mature or spawning portion of the population. (PDF file contains 38 pages.)

Item Type: Monograph or Serial Issue
Title: Greenland turbot Reinhardtius hippoglossoides of the eastern Bering Sea and Aleutian Islands region
Personal Creator/Author:
CreatorsEmail
Alton, Miles S.
Bakkala, Richard G.
Walters, Gary E.
Munro, Peter T.
Series Name: NOAA Technical Report NMFS
Number: 71
Date: 1998
Publisher: NOAA/National Marine Fisheries Service
Issuing Agency: United States National Marine Fisheries Service
Subjects: Ecology
Management
Fisheries
Item ID: 2750
Depositing User: Patti M. Marraro
Date Deposited: 04 Nov 2009 15:42
Last Modified: 29 Sep 2011 18:24
URI: http://aquaticcommons.org/id/eprint/2750

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