|Marine Resource Fact Sheet|
|Ling - Other areas of Northeast Atlantic|
|Ling in Divisions VI, VII, VIII, IX, XII, XIV and Subdivisions IIIa, IVa|
|FAO Names: en - Ling, fr - Lingue franche, es - Maruca, ru - Мольва обыкновенная|
|Considered a single stock: Yes
Spatial Scale: Sub-Regional|
Reference year: 2008
Biological State and Trend
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 18.104.22.168.1).
Habitat and Biology
Depth zone: Slope (200 m - 1000 m). Vertical distribution: Demersal/Benthic.
Water Area Overview
Spatial Scale: Sub-Regional
Considered a single stock: Yes
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.
Total landings for ling by area are presented in Table 22.214.171.124.1. Landings were available for all relevant fleets (Table 126.96.36.199.2). 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 188.8.131.52.1.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 184.108.40.206.1. Table 220.127.116.11.2. Table 18.104.22.168.3. Table 22.214.171.124.3. cont. Table 126.96.36.199.4. Table 188.8.131.52.5.
|Figure 184.108.40.206.1. 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. |
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 AdviceSingle-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 AdviceManagement 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.
Source of information
ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.