Fisheries and Resources Monitoring System

EspañolFrançais
European hake - Eastern Ionian Sea
Fact Sheet Title  Fact Sheet
Stock status report 2021
European hake - Eastern Ionian Sea
Fact Sheet Citation  
Merluccius merluccius - Eastern Ionian Sea (GSA 20)
Owned byGeneral Fisheries Commission for the Mediterranean (GFCM) – ownership
ident Blockident Blockdisplay tree map
 
Species List:
Species Ref: en - European hake, fr - Merlu européen, es - Merluza europea, ru - Мерлуза восточноатлантическая

Fishery Indicators
Production: Catch
ident Block European hake - 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 = 1.83)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; Hard bottom.   Depth Zone: Shelf (50 m - 200 m); Slope (200 m - 1000 m).   Horizontal Dist: Neritic.   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
 

The stock is exploited by various Greek fleet segments, including bottom trawlers and small-scale fisheries using gillnets and demersal longlines. The majority of landings (~60 percent ) is coming from bottom trawlers. The Greek bottom trawl fishery has multi-species characteristics and similarly to most Mediterranean demersal trawl fisheries, captures more than 100 commercial species. However, European hake together with red mullets and shrimps compose the main bulk of landings. European hake alone comprises 5-15 percent of the total landings in the Ionian Sea.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 651.47tonnes2003
Catch 774.25tonnes2004
Catch 1 010.4tonnes2005
Catch 1 280.75tonnes2006
Catch 1 742.66tonnes2007
Catch 1 442.15tonnes2008
Catch 1 096.18tonnes2009
Catch 1 022.41tonnes2010
Catch 1 193.28tonnes2011
Catch 1 214.47tonnes2012
Catch 1 057.99tonnes2013
Catch 818.83tonnes2014
Catch 602.17tonnes2015
Catch 423.87tonnes2016
Catch 484.1tonnes2017
Catch 656.68tonnes2018
Catch 883.46tonnes2019
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 and maturity vectors were the ones used in last year’s benchmark. The official landings data as reported through the HELSTAT were used in the assessment. Discards ratio to landings was estimated using DCF data and total discards data were calculated using the HELSTAT data. 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 european hake in GSA 20 (reporting year: 2021). Click to openhttps://gfcm.sharepoint.com/EG/_layouts/15/download.aspx?share=EWrgVyanfvJOte4hjMH2dmYB-AIksWvfSfNYnnyIP-2how
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/
powered by FIGIS  © FAO, 2024
Powered by FIGIS
crawl