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| Fact Sheet Title Fact Sheet |
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| Haddock - West of Scotland |
 | Haddock in Division VIa (West of Scotland) |
| | 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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| ident Block | ident Block | | | | Species List: | | Species Ref: en - Haddock, fr - Églefin, es - Eglefino, zh - 黑线鳕, ru - Пикша |
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| ident Block Haddock - West of Scotland
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| fao Div |
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| 27.6.a | Northwest Coast of Scotland and North Ireland or as the West of Scotland (Division 27.6.a) |
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| Aq Res | Biological Stock: Yes
Value: Sub-Regional
Management unit: Yes
Reference year: 2012
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| 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 Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | | | Aq Res State Trend  | Figure 5.4.23.1  |
The 2009 year class is above the average in the recent period, but is below the long-term average. Nevertheless, this year class is the main contributor to the increase of the SSB in 2012 to above B lim. F has been above F pa in most years since 1987 and has been declining since 1999. F is now below F MSY. Habitat Bio Depth Zone: Shelf (50 m - 200 m). Vertical Dist: Demersal/Benthic. Haddock are widely distributed across the continental shelf from the North Sea to the Celtic Sea. There is some connectivity with the haddock stock in the North Sea, which is assessed as a different stock. The stock–recruit relationship for haddock is characterized by sporadic high recruitments. There may be periods of low recruitment at any stock size. Geo Dist Geo Dist: Shared between nations Water Area Overview Spatial Scale: Sub-Regional
Ecoregion: Celtic Sea and West of Scotland.
Water Area Overview  | | Water Area Overview Haddock - West of Scotland
| fao Div | 27.6.a: Northwest Coast of Scotland and North Ireland or as the West of Scotland (Division 27.6.a) |
| | | | | | Water Area Overview |
Water Area OverviewHaddock - West of Scotland | fao Major | 27:
Atlantic, Northeast | | Large Marine Ecosystem Areas (LME) | 22: North Sea | | 24: Celtic-Biscay Shelf | | 60: Faroe Plateau |
Aq Res Struct Biological Stock: Yes Exploit The fisheriesHaddock in Division VIa is caught mainly by Scottish and Irish bottom trawlers, which target mixed demersal fish assemblages. Catches are widely distributed and are concentrated in several areas, e.g. Butt of Lewis and on the shelf west of the Outer Hebrides. The total catch for haddock is estimated to be 3227 tonnes; 46% of these are discards. Splitting discards by fleet shows that Nephrops vessels (TR2) are responsible for ~80% of all discards while landing only 80 tonnes, less than 5% of the total landings (1742 tonnes).
| Catch distribution |
Total catch (2011) = 3227 t, where the demersal fish fleet (TR1) contributes 1916 t (1633 t landed, 284 t discarded) and the Nephrops fleet (TR2) 1236 t (80 t landed, 1156 t discarded). Unaccounted removals are ~2%, representing ~75 t |
Bio Assess Sci Advice ICES advises on the basis of the MSY framework that landings in 2013 should be no more than 3100 t. Effective technical measures should be implemented to reduced high discard rates in the Nephrops fleet (TR2). Results  | | Figure 5.4.23.1 Haddock in Division VIa (West of Scotland). ICES observed catches and summary of stock assessment (weights in thousand tonnes). Predicted recruitment values are shaded. Top right: SSB/F for the time-series used in the assessment. |
Assess Models Quality considerationIn 2010 the catch-at-age data from 2006 onwards were re-introduced to the assessment, based on evidence from the improved accuracy of landings statistics. The survey design and gear of the Scottish west coast surveys (ScoGFS-WIBTS-Q1 and ScoGFS-WIBTS-Q4) were changed and will be maintained hereafter. Since 2011, the assessment has been relying on new catch data. With no survey to give indication on recruitment, the last recruitment was calculated from the geometric mean for (2004–2009).  | | Figure 5.4.23.2 Haddock in Division VIa (West of Scotland). Historical assessment results (final-year recruitment estimates included). |
Scientific basis
| Assessment type |
Analytical age-based assessment (TSA). |
| Input data |
Two survey indices (ScoGFS-WIBTS-Q1 up to 2010, ScoGFS-WIBTS-Q4 up to 2009). |
| Discards and bycatch |
Included in the assessment. |
| Indicators |
IRGFS-WIBTS-Q4, UKSGFS-WIBTS-Q1, and UKSGFS-IBTS-Q4. |
| Other information |
Catch data were re-introduced for years since 2006. The advice issued in September supersedes the June advice. |
| Working group report |
WGCSE |
Management Management unit: Yes Management plansAn EU management plan proposal (See Annex 5.4.23) was evaluated by ICES and is considered to be precautionary. The aim of this plan is to keep the SSB above 30 000 tonnes with a fishing mortality of no more than 0.3. The main elements in the plan are a 25% constraint on TAC change between years and lower fishing mortality rates whenever the SSB is lower than 30 000 t. Sources The above excerpts are from the first two pages of the ICES advice, the supporting information to this advice can be read in full at the following reference: ICES. Haddock in Division VIa (West of Scotland). Report of the ICES Advisory Committee, 2012. ICES Advice, September 2012.  http://www.ices.dk/committe/acom/comwork/report/2012/2012/had-scow.pdf |
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