Fishery Resources Monitoring System

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Brill - Baltic Sea, 2012
Marine Resource  Fact Sheet
ICES Advice 2012
Brill - Baltic Sea, 2012
Fact Sheet Citation  
Brill in Subdivisions 22 - 32 (Baltic Sea)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
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Species:
FAO Names: en - Brill, fr - Barbue, es - Rémol
Geographic extent of Brill - Baltic Sea
Main Descriptors
Considered a single stock: No        Spatial Scale: Sub-Regional
Management unit: Yes
 
 
Habitat and Biology
Depth zone: Shelf (50 m - 200 m).   Vertical distribution: Demersal/Benthic.  


Brill (Scophthalmus rhombus) is distributed mainly in the western part of the Baltic Sea. The easterly border of its occurrence is not clearly described, but brill is very rare in Subdivisions 26–32. Brill is a predator on small fish. Spawning takes place at depths of 5 to 40 m from March to August only in the western part of the Baltic Sea. Nursery areas are located in shallow coastal waters.

There is no information on the stock identity of this species: it is therefore not known if there is one or more stocks in the Baltic Sea or if brill in the Baltic is part of a larger stock complex.
Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Sub-Regional


Ecoregion: Baltic Sea
Geo References
Resource Structure
Considered a single stock: No
Exploitation
 

The fisheries


Brill in the Baltic Sea are mainly taken as a bycatch in trawl and gillnet fisheries.
Catch distribution No information on total catch (2011), 57 t landings (mainly trawl fishery, substantially under-reported), no information on discards is available.
Assessment
 
Scientific Advice

Based on the ICES approach for data-limited stocks, ICES advises that catches should be no more than 68 tonnes.

This is the first year that ICES is providing quantitative advice for data-limited stocks (see Quality considerations).
Overall Assessment Results
Figure 8.4.13.1 Brill in Subdivisions 22–32 (Baltic Sea). Official landings (in tonnes, left panel). Combined 1st and 4th quarters cpue (no./hr) (weighted average per depth stratum area), of fish equal to or larger than 20 cm, from the Baltic international trawl survey (BITS-Q1+Q4) in Subdivisions 22, 23, and 24 (right panel, from ICES DATRAS database).
Assessment Model

Quality consideration


Data collection, especially regarding stock structure and stock identification and on the amount of discards, needs to be improved in order to get a better understanding of the state of brill in the Baltic Sea.

The advice is based on a combined abundance index from two surveys, used as an indicator of stock size. The uncertainty associated with the index values is not available.

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 Survey trends.
Input data Commercial landings and survey data from the Baltic International Trawl Survey (BITS-Q1+Q4).
Discards and bycatch Information not available.
Indicators None.
Other information None.
Working group report WGBFAS
Management
Management unit: Yes


Management plans


No specific management objectives are known to ICES.
Biological State and Trend
Exploitation rate: Unknown
Abundance level: Unknown
Figure 8.4.13.1

The survey data suggest an increasing trend in stock size. The average stock size indicator (number/hour) in the last two years (2010–2011) is 132% higher than the average of the three previous years (2007–2009).
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. Brill in Subdivisions 22–32 (Baltic Sea). Report of the ICES Advisory Committee, 2012. ICES Advice, June 2012. Click to openhttp://www.ices.dk/committe/acom/comwork/report/2012/2012/bll-2232.pdf
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