Fisheries and Resources Monitoring System

Plaice - Southwest of Ireland
Marine Resource  Fact Sheet
ICES Advice 2012
Plaice - Southwest of Ireland
Fact Sheet Citation  
Plaice in Divisions VIIh-k (Southwest of Ireland)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - European plaice, fr - Plie d'Europe, es - Solla europea, ru - Камбала морская
Geographic extent of Plaice - Southwest of Ireland
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Sub-Regional
Management unit: Yes        Reference year: 2012
Biological State and Trend
State & Trend Descriptors
Exploitation rateUnknownUncertain/Not assessed
Abundance levelUnknownUncertain/Not assessed

The state of the stock is unknown; however, exploratory estimates show that fishing mortality has decreased since 2008, but it remains above potential FMSY proxies. Recent values of Z ranged from 0.55 to 1.2, with M=0.12 this would result in an F of between 0.43 and 1.08.
Habitat and Biology
Depth zone: Shelf (50 m - 200 m).   Vertical distribution: Demersal/Benthic.  

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

The fisheries

Plaice in Division VIIh–k are mainly taken as bycatch in mixed inshore fisheries in Division VIIj. Discard rates are very high >60% by weight.
Catch distribution Total landings (2011) 180 t, Discards ~200 t.
Scientific Advice

Based on the ICES approach for data limited stocks, ICES advises that catches should be no more than 100 tonnes, and bycatch and discards should be reduced.

This is the first year that ICES is providing quantitative advice for data limited stocks (see Quality considerations).
Overall Assessment Results
Figure Plaice in Divisions VIIh–k. Official landings (left plot). Catch curves analysis (right plot).
Assessment Model

Quality consideration

There is no accepted analytical assessment for this stock.

Catch numbers-at-age are only available for Irish landings. Total mortality (Z) estimates are extremely volatile from one year to another, but always above any MSY proxy. ICES considered that the average fishing mortality estimates over the last 3 years derived from catch curves analysis were reliable enough and could be used as a basis for advice.

The advice is based on a catch curve analysis used as an indicator of fishing mortality. The uncertainty associated with the estimates is not quantified.

The methods applied to derive quantitative advice for data limited stocks are expected to evolve as they are further developed and validated. The harvest control rules are expected to stabilize stock size, but they may not be suitable if the stock size is low and/or overfished.

Scientific basis

Assessment type Catch curves analysis.
Input data Official landings-at-age 1993–2011 for Divisions VIIjk only.
Discards and bycatch Not included in the assessment.
Indicators None.
Other information Yield per recruit analysis.
Working group report WGCSE
Management unit: Yes

Management plans

No specific management objectives are known to ICES.
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. Plaice in Divisions VIIh–k (Southwest of Ireland). Report of the ICES Advisory Committee, 2012. ICES Advice, June 2012. Click to open
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