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Red mullet - Aegean Sea
Fact Sheet Title  Fact Sheet
Stock status report 2021
Red mullet - Aegean Sea
Fact Sheet Citation  
Mullus barbatus - Aegean Sea (GSA 22)
Owned byGeneral Fisheries Commission for the Mediterranean (GFCM) – ownership
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Species List:
Species Ref: en - Red mullet, fr - Rouget de vase, es - Salmonete de fango, ru - Султанка обыкновенная (=барабулька)

Fishery Indicators
Production: Catch
ident Block Red mullet - Aegean Sea
Aq Res
Biological Stock: No         Value: Sub-Regional
Reference year: 2019
 
 
Aq Res State Trend
Aq Res State Trend
Aq Res State Trend Aq Res State Trend
Aq Res State TrendSustainably exploited (F/Fref = 0.3)Not applicable
Aq Res State TrendNot applicable
Aq Res State Trend
Aq Res State TrendUnderfished

Sustainably exploited.
[The GFCM methodology to provide stock status and management advice is described in the Appendix F of the Sixteenth Session of the Scientific Advisory Committee Report. See the Bibliography section.]
Habitat Bio
Climatic Zone: Temperate.   Bottom Type: Soft bottom.   Depth Zone: Shelf (50 m - 200 m).   Horizontal Dist: Neritic; Littoral.   Vertical Dist: Demersal/Benthic.  

Water Area Overview
Spatial Scale: Sub-Regional

Water Area Overview
Aq Res Struct
Biological Stock: No


Stock assessment in the GFCM area of application is often conducted by management units, based on GSAs. This method does not ensure that the whole stock is assessed, since stocks may cover several different management units. In some cases, when there is scientific evidence of a stock spreading through different GSAs, as well as information on species from different GSAs, existing information is combined across GSAs. This is then defined as a “joint stock assessment of a shared stock”. The GFCM recommends that when scientific evidence of shared stocks exists, joint stock assessments should be attempted. A number of activities aimed at achieving a better definition of stock boundaries are currently being conducted at the GFCM level. [The State of Mediterranean and Black Sea Fisheries, 2016]
Exploit
 

Red mullet is exploited by bottom trawlers and various small-scale fisheries using gillnets. Most catches come from the Greek fleets exploiting the area and the majority originates from bottom trawlers (~80percent). The Greek bottom trawl fishery has multi-species characteristics and similarly to most Mediterranean demersal trawl fisheries, captures more than 100 commercial species. However, few species, such as red mullets, European hake and shrimps, compose the main bulk of landings, with red mullet being one of the most important targets.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 1483tonnes2003
Catch 2347tonnes2004
Catch 3014tonnes2005
Catch 3001tonnes2006
Catch 2852tonnes2007
Catch 2317tonnes2008
Catch 2191tonnes2009
Catch 2476tonnes2010
Catch 2790tonnes2011
Catch 2667tonnes2012
Catch 2401tonnes2013
Catch 2147tonnes2014
Catch 1901tonnes2015
Catch 1786tonnes2016
Catch 1767tonnes2017
Catch 1819tonnes2018
Catch 1804tonnes2019
Bio Assess
 
Data

Biological information on growth, i.e. the von Bertalanffy parameters, as well the length-weight relationship were derived within DCF. Natural mortality vector was estimated using the Chen and Watanabe method while the proportion of mature individuals at age was based on recent bibliography The official landing data as reported through the HELSTAT were used in the assessment. Catch-at-size data, as reported in DCF, were used in the assessment. Both catch numbers at length and index number at length were sliced using the l2a age slicing function of FLR.
Assess Models
Type:  Age-structured
a4a

A SCAA model (a4a) was used and FLBRP package for yield per recruit analysis, both part of the FLR. The assessment was carried out over the period 2003-2019, calibrated with fishery independent survey abundance index (MEDITS). To select the final model for assessment, combinations of various options for submodels regarding fishing mortality, survey catchability and stock recruitment were investigated. The best model was selected in the basis of better residuals and retrospective patterns.
Results

In the most recent years, biomass shows increasing trends, while F has shown a constant decreasing trend since 2007.
Sci Advice

Not to increase fishing mortality.
Sources
 
FAO. 2021. General Fisheries Commission for the Mediterranean (GFCM). Report of the twenty-second session of the Scientific Advisory Committee on Fisheries, online, 22–25 June 2021. FAO Fisheries and Aquaculture Report No. 1347. Rome. Click to openhttps://www.fao.org/3/cb7622en/cb7622en.pdf
Report of the Working Group on Stock Assessment of Demersal Species (WGSAD). Online, 18–23 January 2021. Click to openhttps://www.fao.org/gfcm/technical-meetings/detail/en/c/1412431/
GFCM Stock Assessment Results (STAR) for red mullet in GSA 22 (reporting year: 2021). Click to openhttps://gfcm.sharepoint.com/EG/_layouts/15/download.aspx?share=EfBI3kq3Ce5LlVAGCfbVMwsBLe6mH9fzIA4JgjJBwIgiNw
Bibliography
 
FAO. 2020. The State of Mediterranean and Black Sea Fisheries 2020. General Fisheries Commission for the Mediterranean. Rome. Click to openhttps://www.fao.org/3/cb2427en/cb2427en.pdf
FAO. 2016. The State of Mediterranean and Black Sea Fisheries. General Fisheries Commission for the Mediterranean. Rome, Italy. Click to openhttps://www.fao.org/3/i5496e/i5496e.pdf
FAO General Fisheries Commission for the Mediterranean/Commission générale des pêches pour la Méditerranée. Report of the sixteenth session of the Scientific Advisory Committee. St. Julian’s, Malta, 17–20 March 2014/Rapport de la seizième session du Comité scientifique consultatif. Saint Julien, Malte, Malte, 17-20 mars 2014. FAO Fisheries and Aquaculture Report/FAO Rapport sur les pêches et l’aquaculture. No. R1102. Rome. 2015. 250 pp. Click to openhttps://www.fao.org/3/i4381b/i4381b.pdf
General Fisheries Commission for the Mediterranean (GFCM) Stock Assessment Results (STAR). Click to openhttps://www.fao.org/gfcm/data/star/en/
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