Fisheries and Resources Monitoring System

Ling - Barents Sea, Norwegian Sea, Spitzbergen and Bear Island
Marine Resource  Fact Sheet
ICES Advice 2009
Ling - Barents Sea, Norwegian Sea, Spitzbergen and Bear Island
Fact Sheet Citation  
Ling in Subdivisions I and II (Arctic)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Ling, fr - Lingue franche, es - Maruca, ru - Мольва обыкновенная
Geographic extent of Ling - Barents Sea, Norwegian Sea, Spitzbergen and Bear Island
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
Reference year: 2008
Habitat and Biology
Depth zone: Slope (200 m - 1000 m).   Vertical distribution: Demersal/Benthic.  

Water Area Overview
Spatial Scale: Sub-Regional

Geo References
Resource Structure
Considered a single stock: Yes

Factors affecting the fisheries and the stock

No information.
Assessment Model

Scientific basis

Landings were available for all relevant fleets (Table New discard data were not available. Length compositions/mean lengths were available from 1976 to the present, based on data from the Norwegian longliners. Catch and effort data for Norwegian longliners were available, both from the overall fleet and for a set of four vessels, “the reference fleet”, with which there is a special agreement on reporting for scientific purposes. These series are for the years 2000–2006. For the period 1971–1994, a series of standardized cpue estimates were available derived from skippers’ logbooks (Figure

Comparison with previous assessment and advice

The information base is similar to previous assessments. The Advice is unchanged in magnitude of the recommended catch.
Overall Assessment Results

Figure Ling in Division IIa. Estimates of Norwegian longline cpue (kg/1000 hooks) based on skippers’ logbooks (pre-2000) and from the entire fleet (2000–2006).

Figure Ling in Division I&II. Landings by subarea or division. Source: ICES estimates.

Reference Point

Not defined.
Scientific Advice

Single-stock exploitation boundaries

Cpue in Areas I and II has been at a reduced level. ICES reiterates the advice to constrain catches to 6000 t and to collect information that can be used to evaluate a long-term sustainable level of exploitation.
Management Advice

Management considerations

The cpue is used as an indicator of stock trend but it is unclear whether cpue in recent years is adjusted for changes in efficiency of fishing.

The landings in 2007 were the highest in the time-series (Table, Figure
Biological State and Trend
State & Trend Descriptors
Exploitation rateUndefinedUncertain/Not assessed
Abundance levelUndefinedUncertain/Not assessed

Commercial cpue for Norwegian longliners has in recent years been lower than observed in the 1970s and 1980s. There is some evidence of a recent increase (Figure
Source of information
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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