Fishery Resources Monitoring System

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Ling - Other areas of Northeast Atlantic, 2008
Marine Resource  Fact Sheet
ICES Advice 2009
Ling - Other areas of Northeast Atlantic, 2008
Fact Sheet Citation  
Ling in Divisions VI, VII, VIII, IX, XII, XIV and Subdivisions IIIa, IVa
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 - Other areas of Northeast Atlantic
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

Since 2003 an annual unilateral TAC was introduced by the EC for all subareas, and the regulation is valid for EU vessels fishing in the EU EEZ as well as in international waters. There is no species-specific regulation in the Norwegian EEZ. A TAC is negotiated for Norwegian vessels fishing in EU waters.

Changes in fishing technology and fishing patterns

The major directed fishery for ling in Divisions IVa and VI is by Norwegian longlining. The bulk of the landings from other countries are bycatches in trawl fisheries mainly directed at roundfish or deep-sea species. The landings from the central and southern North Sea (IVb, c) are bycatches in various other fisheries. In Subarea VII the main landings are generated by Norwegian and some Irish and Spanish longline fisheries. In Subareas VIII, IX, XII, and XIV all landings are bycatches in various fisheries.
Assessment
 
Assessment Model
Methodology

Scientific basis

Total landings for ling by area are presented in Table 9.4.10.4.1. Landings were available for all relevant fleets (Table 9.4.10.4.2). Discard data were not available.

Catch and effort data for Norwegian longliners are available, both from the overall fleet (1971–1994), from the entire fleet of longliners (2000–2006), and from a “reference fleet” of 4 vessels (2000–2006). The reference fleet is by special agreement tasked with reporting to science and supplies information on catch rates and biological measurements. The cpue series in the period 1971–1994 is derived from skippers’ logbooks. The cpue series for 2000–2006 is based on catch and effort in number of hooks per day. The consistency between the two series needs to be further explored. The reference fleet may not cover the entire area and hence the data from the entire fleet were used in Figure 9.4.10.4.1.

Comparison with previous assessment and advice

The interpretation of the information on ling in the management units has remained the same since the advice in 2006. The basis of the advice is the same as in 2006.
Overall Assessment Results

Table 9.4.10.4.1. Table 9.4.10.4.2. Table 9.4.10.4.3. Table 9.4.10.4.3. cont. Table 9.4.10.4.4. Table 9.4.10.4.5.
Figure 9.4.10.4.1. Norwegian longliner cpue (kg/1000 hooks) of ling based on skippers’ logbooks (before 1994, dots) and the logbooks from the entire fleet (after 2000, squares). Different cpue scale between areas.

Reference Point
 

In common with other deep-water stocks, Ulim has previously been proposed at 0.2* virgin biomass and Upa at 0.5* virgin biomass (ICES, 1998). In the absence of consistent effort definitions between different periods, the reference points cannot be calculated.
Scientific Advice

Single-stock exploitation boundaries

Cpue in these areas has been at a reduced level. ICES reiterates the advice to constrain catches to 10 000 t and to collect information that can be used to evaluate a long-term sustainable level of exploitation.
Management
 
Management Advice

Management considerations

The major directed fishery for ling in Subdivision VI is by Norwegian longliners. Trawl fisheries in the United Kingdom (Scotland) and France primarily take ling as bycatch.

The fishery covers a wide area and to avoid local overexploitation disproportionate allocation of effort among areas should be avoided.
Biological State and Trend
Exploitation rate: Undefined
Abundance level: Undefined

The cpue series of the main fleet in Divisions IVa, Via, and VIb suggest that the abundance has remained at a reduced level after the decline in the 1970s to 1990s (Figure 9.4.10.4.1).
Source of information
 
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.
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