Fishery Resources Monitoring System

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Ling - Barents Sea, Norwegian Sea, Spitzbergen and Bear Island, 2008
Marine Resource  Fact Sheet
ICES Advice 2009
Ling - Barents Sea, Norwegian Sea, Spitzbergen and Bear Island, 2008
Fact Sheet Citation  
Ling in Subdivisions I and II (Arctic)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
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Species:
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
 
 
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
Exploitation
 

Factors affecting the fisheries and the stock

No information.
Assessment
 
Assessment Model
Methodology

Scientific basis

Landings were available for all relevant fleets (Table 9.4.10.1.1). 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 9.4.10.1.1).

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

Table 9.4.10.1.1.
Figure 9.4.10.1.1. 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 9.4.10.1.2. 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
 
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 9.4.10.1.1, Figure 9.4.10.1.1).
Biological State and Trend
Exploitation rate: Undefined
Abundance level: Undefined

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 9.4.10.1.1).
Source of information
 
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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