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Red mullet - Eastern Ionian Sea
Fact Sheet Title  Fact Sheet
Stock status report 2021
Red mullet - Eastern Ionian Sea
Fact Sheet Citation  
Mullus barbatus - Eastern Ionian Sea (GSA 20)
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 - Eastern Ionian 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 TrendIn overexploitation (F/Fref = 1.19)Not applicable
Aq Res State TrendNot applicable
Aq Res State Trend
Aq Res State TrendOverfished

In overexploitation.
[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 (~80 percent). 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 360tonnes2003
Catch 299tonnes2004
Catch 270tonnes2005
Catch 263tonnes2006
Catch 261tonnes2007
Catch 277tonnes2008
Catch 315tonnes2009
Catch 339tonnes2010
Catch 316tonnes2011
Catch 270tonnes2012
Catch 230tonnes2013
Catch 206tonnes2014
Catch 204tonnes2015
Catch 234tonnes2016
Catch 303tonnes2017
Catch 356tonnes2018
Catch 324tonnes2019
Bio Assess
 
Data

Biological information on growth, such as 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 maturity vectors were derived within DCF. The official landings 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 Y/R 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 on the basis of better residuals and retrospective patterns.
Results

In the most recent years, biomass shows increasing trends, while F is decreasing.
Sci Advice

Reduce fishing mortality; STF available.
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 20 (reporting year: 2020). Click to openhttps://gfcm.sharepoint.com/EG/_layouts/15/download.aspx?share=ESYOuEMHY5VImgClwKILsBkBnx0CDbrerT6HdkPzVA8qhw
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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