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European hake - Northern and Southern Adriatic Sea
Fact Sheet Title  Fact Sheet
Stock status report 2021
European hake - Northern and Southern Adriatic Sea
Fact Sheet Citation  
Merluccius merluccius - Northern and Southern Adriatic Sea (GSAs 17-18)
Owned byGeneral Fisheries Commission for the Mediterranean (GFCM) – ownership
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Species List:
Species Ref: en - European hake, fr - Merlu européen, es - Merluza europea, ru - Мерлуза восточноатлантическая

Fishery Indicators
Production: Catch
ident Block European hake - Northern and Southern Adriatic Sea
Aq Res
Biological Stock: No         Value: Sub-Regional
Management unit: Yes        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 = 2.72)Not applicable
Aq Res State TrendBiomass above the reference point (B/Bthreshold = 1.56; B/Blimit = 2.14)Not applicable
Aq Res State Trend
Aq Res State TrendNot applicable

Biomass above the reference point and 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
 

European hake is one of the most important demersal species in the Adriatic Sea. In this area, European hake is exploited mainly by bottom trawlers and in the southern part of the Adriatic Sea and in Croatian waters longlines are also relevant. Landings present a fluctuating trend all over the time series considered accounting for the highest value in 2006 and the lowest value in 2019. Italy is the country that mainly exploits this species; in particular, Italian bottom trawl catches of GSAs 17 and 18 represent around 75 percent of the total Adriatic catches. Bottom trawl catches are mainly composed of ages 0, 1 and 2, whereas longlines exploit bigger individuals.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 9 441tonnes1998
Catch 6 666tonnes1999
Catch 6 268tonnes2000
Catch 6 206tonnes2001
Catch 5 442tonnes2002
Catch 7 322tonnes2003
Catch 7 336tonnes2004
Catch 8 772tonnes2005
Catch 10 832tonnes2006
Catch 8 959tonnes2007
Catch 8 312tonnes2008
Catch 7 998tonnes2009
Catch 6 923tonnes2010
Catch 6 416tonnes2011
Catch 6 818tonnes2012
Catch 6 753tonnes2013
Catch 5 493tonnes2014
Catch 5 817tonnes2015
Catch 5 764tonnes2016
Catch 6 033tonnes2017
Catch 6 167tonnes2018
Catch 5 353tonnes2019
Bio Assess
 
Data

The biological information, specifically growth and length-weight relationship parameters, is assumed equal to those estimated by the DCF sampling protocol in the Italian GSA 18. Catch data are included by country and gear, as well as the length composition of catches. Survey data corresponds to the MEDITS index including both GSAs 17 and 18.
Assess Models
Type:  Others
SS3

The present assessment is an update of the evaluation presented in 2019. The fundamental idea of this stock assessment is to use the integrated approach of SS3 (version SS3.3) to model the size structure data available for European hake. SS3 uses forward projection of population in the SCAA approach.
Results

The overall stock status conclusions confirm the positive trend depicted in the last years assessment; SSB shows a continuous decreasing trend, while fishing mortality has constantly decreased since 2015. Recruitment has quite a stable trend. Reference points were estimated from SS3 and following the International Council for the Exploration of the Sea (ICES) procedure (ICES, 2017) in the framework of the benchmark (GFCM, 2019).
Management
Management unit: Yes


GSAs 17-18.
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 GSAs 17-18 (reporting year: 2021). Click to openhttps://gfcm.sharepoint.com/EG/_layouts/15/download.aspx?share=EZP2X7lKge9Nv-PAVSbkKFMBnpHtzO9hV1D9WoA1DuYL0w
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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