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Haddock - West of Scotland
Marine Resource  Fact Sheet
ICES Advice 2012
Haddock - West of Scotland
Fact Sheet Citation  
Haddock in Division VIa (West of Scotland)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
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Species:
FAO Names: en - Haddock, fr - Églefin, es - Eglefino, zh - 黑线鳕, ru - Пикша
Geographic extent of Haddock - West of Scotland
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
Management unit: Yes        Reference year: 2012
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateBelow targetModerate fishing mortality
Abundance levelBelow triggerLow abundance
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 Blim. F has been above Fpa in most years since 1987 and has been declining since 1999. F is now below FMSY.
Habitat and Biology
Depth zone: Shelf (50 m - 200 m).   Vertical distribution: 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.
Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Sub-Regional


Ecoregion: Celtic Sea and West of Scotland.
Geo References
Resource Structure
Considered a single stock: Yes
Exploitation
 

The fisheries


Haddock 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
Assessment
 
Scientific 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).
Overall Assessment 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.
Assessment Model

Quality consideration


In 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 plans


An 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.
Source of information
 

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. Click to openhttp://www.ices.dk/committe/acom/comwork/report/2012/2012/had-scow.pdf
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