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| Marine Resource Fact Sheet |
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| Blue Ling - Iceland and Reykjanes Ridge |
 | Blue ling in Subdivisions Va and XIV (Iceland and Reykjanes Ridge) |
| | Data Ownership | | This document provided, maintained and owned by International Council for the Exploration of the Sea (ICES) , is part of ICES Advice data collection. |
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| Related observations | Locate in inventory | | | | Species: | | FAO Names: en - Blue ling, fr - Lingue bleue, es - Maruca azul, ru - Мольва голубая (=биркеланга) |
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| Geographic extent of Blue Ling - Iceland and Reykjanes Ridge
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| FAO Fishing Statistical Division Areas |
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| 27.5.a | Iceland Grounds (Division Va) |
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| FAO Fishing Statistical Sub Areas |
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| 27.14 | East Greenland (Subarea XIV) |
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| Main Descriptors | Considered a single stock: Yes
Spatial Scale: Sub-Regional
Reference Year: 2008 |
| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| Reference Year: The last year considered in the assessment. |
| | | | | | Habitat and Biology Depth zone: Slope (200 m - 1000 m). Vertical distribution: Demersal/Benthic. Geographical Distribution Jurisdictional distribution: National Water Area Overview Spatial Scale: Sub-Regional Geo References  | | Geographic extent of Blue Ling - Iceland and Reykjanes Ridge
| FAO Fishing Statistical Division Areas | 27.5.a: Iceland Grounds (Division Va) | | FAO Fishing Statistical Sub Areas | 27.14: East Greenland (Subarea XIV) |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Blue Ling - Iceland and Reykjanes Ridge | FAO Major Fishing Areas | 27:
Atlantic, Northeast | | Large Marine Ecosystem Areas (LME) | 19: East Greenland Shelf | | 21: Norwegian Shelf | | 59: East Greenland Shelf/Sea | | 64: Arctic Ocean | | 65: Arctic Archipelago |
Resource Structure Considered a single stock: Yes Assessment Assessment Model Methodology Scientific basisThe cpue series that is used as the basis for advice is derived from trips where blue ling accounts for more than 10% of the total catch (Figure 9.4.11.1.1). Two trawl surveys are available (Figure 9.4.11.1.3). The spring survey does not cover the full depth range of blue ling and is considered inappropriate. The autumn survey does cover the full depth range, but the time-series is too short to contain a useful signal and available information indicated stability in recent years. Landings dataseries have been extended back in time to include data not previously presented (Figure 9.4.11.1.2 and Table 9.4.11.1.1). Comparison with previous assessment and adviceThere are no changes to the perception of the status of blue ling in Subdivisions Va and XIV. The current advice is in line with previous advice. Overall Assessment Results Table 9.4.11.1.1.  | Figure 9.4.11.1.1. Blue ling. Index of raw cpue (sum(yield)/sum(effort)) of blue ling from the Icelandic bottom trawl fishery based on logbooks 1991–2007. The criteria for the calculations were tows where blue ling composed at least 10% of the total catch in each haul.  |
 | | Figure 9.4.11.1.2. Blue ling in Areas Va and XIV. Estimated total landings. Estimates for XIV prior to 1973 have not been compiled. |
 | | Figure 9.4.11.1.3. Blue ling. Abundance indices for blue ling in the groundfish survey in March 1985–2008 (SMB, line, shaded area) and October 2000–2007 (SMH, points, vertical lines). a) Abundance of fish smaller than 40 cm, b) Biomass of fish larger than 40 cm. The shaded area shows 1 standard error of the estimate. |
Reference Point In common with other deep-water stocks, U lim has previously been proposed at 0.2* virgin biomass and U pa at 0.5* virgin biomass (ICES, 1998). In the absence of abundance indices that correspond to the start of the fishery, the reference points cannot be calculated. Scientific Advice Single-stock exploitation boundariesThere should be no directed fisheries for blue ling in Areas Va and XIV and measures should be implemented to minimize catches in mixed fisheries. Blue ling is susceptible to sequential depletion of spawning aggregations and closed areas to protect spawning aggregations should therefore be maintained and expanded where appropriate. Management Management Advice Management considerationsOpportunistic fishery on spawning aggregations account for pulses in landings in the early 1980s and in 1993. Two closed areas to protect spawning aggregations in Subdivision Va have been introduced in 2003. If new spawning grounds are discovered it is important that an immediate closure is set in place. ICES has issued an answer to a request by NEAFC on spawning areas for blue ling in Section 9.3.2.7. Blue ling is mostly taken as a bycatch in fisheries for cod, haddock, and saithe in Subdivision Va. Biological State and Trend Exploitation rate: Undefined
Abundance level: Undefined Cpue of blue ling in Va and XIV has steadily declined from 1991 to 2000 and has remained at a low level since then (Figure 9.4.11.1.1). Source of information ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009. |
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