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Greenland halibut - Barents and Norwegian Seas, 2012
Marine Resource  Fact Sheet
ICES Advice 2012
Greenland halibut - Barents and Norwegian Seas, 2012
Fact Sheet Citation  
Greenland halibut in Subareas I and II
Owned byInternational Council for the Exploration of the Sea (ICES) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Greenland halibut, fr - Flétan noir, es - Fletán negro, ru - Палтус черный (=палтус гренландский)
Geographic extent of Greenland halibut - Barents and Norwegian Seas
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
Management unit: Yes
 
 
Habitat and Biology
Depth zone: Slope (200 m - 1000 m).   Vertical distribution: Demersal/Benthic.  


Greenland halibut is a long-lived species showing considerable sexual dimorphism in growth and maturation. Age-reading methodology for this stock has been reviewed in recent years and there is evidence to show that growth is slower than previously thought.

Tagging studies suggest that some mixing occurs with Greenland halibut in the Iceland/East Greenland area.
Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Sub-Regional


Ecoregion: Barents Sea and Norwegian Sea
Geo References
Resource Structure
Considered a single stock: Yes
Exploitation
 

The fisheries


From 2010 the ban against targeted fishery was lifted by the Joint Russian–Norwegian Fisheries Commission (JRNFC) and since then Greenland halibut has been fished in a directed fishery, and also as bycatch in the fishery for other demersal species.
Catch distribution Total catch (2011) = 16.3 kt, where 100% landings (58% trawl, 31% longline, 10% gillnet, and 1% others). Not relevant for discards
Assessment
 
Scientific Advice

ICES advises on the basis of precautionary considerations that catches should not be allowed to increase and should not exceed 15 000 t.
Overall Assessment Results
Figure 3.4.7.1 Greenland halibut in Subareas I and II. Top left: Landings. Below left: Biomass (swept area) estimate of the mature female biomass (Norwegian Greenland halibut survey along the continental slope in August and Russian autumn trawl survey). Below right: Total biomass estimates from the Norwegian Greenland halibut survey along the continental slope in August and Russian autumn trawl survey. No Norwegian survey in 2010. example of description: Cod in Subareas I and II. Summary of stock assessment (weights in thousand tonnes). Top right: SSB/F for the time-series used in the assessment.
Assessment Model

Quality consideration


None of the current surveys cover the complete stock distribution, but most of the adult distribution area is covered. Biomass estimates from the surveys are not consistent but give evidence of a stable or increasing stock.

Scientific basis

Assessment type Survey trends-based assessment.
Input data Two survey indices (Norwegian slope survey (NO-GH-Btr-Q3), Russian autumn survey (RU-BTr-Q4)).
Discards and bycatch Not included in the assessment.
Indicators Survey indices. Discards are not included and are considered to be minor.
Other information A benchmark is planned for 2013.
Working group report AFWG


Management
Management unit: Yes


Management plans


There are no explicit management objectives for this stock.
Biological State and Trend
Exploitation rate: Unknown
Abundance level: Unknown
Source of information
 

The above excerpts are from the first two pages of the ICES advice, the supporting information to this advice can be read in full at the following reference:
ICES. Greenland halibut in Subareas I and II. Report of the ICES Advisory Committee, 2012. ICES Advice, June 2012. Click to openhttp://www.ices.dk/committe/acom/comwork/report/2012/2012/ghl-arct.pdf
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