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European hake - Northern Alboran Sea
Fact Sheet Title  Fact Sheet
Stock status report 2021
European hake - Northern Alboran Sea
Fact Sheet Citation  
Merluccius merluccius - Northern Alboran Sea (GSA 1)
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 Alboran 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 = 6)Not applicable
Aq Res State TrendRelatively low biomassNot applicable
Aq Res State Trend
Aq Res State TrendOverfished

In overexploitation, with relatively low biomass.
[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 target demersal species of the Mediterranean fishing fleets, largely exploited in GSA 1 mainly by trawlers (91 percent landings) on the shelf and slope, and by small-scale fisheries using gillnets (6 percent) and longlines (3 percent) on the shelf (average 2017-2019). The trawling fleet in the GSA 1 area is made up of 120 boats (2019), averaging 35 gross registered tonnage (GRT) and 176 horse power (HP). Catches of European hake show a decreasing trend from 2012 to 2017, with a slight increase in 2018. In the last year there has been a decrease to 274 tonnes (average 2017-2019: 336 tonnes).
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 289.7tonnes2019
Catch 409.7tonnes2018
Catch 299tonnes2017
Catch 175.8tonnes2016
Catch 183.4tonnes2015
Catch 282.5tonnes2014
Catch 374.4tonnes2013
Catch 461tonnes2012
Catch 683tonnes2011
Catch 576.3tonnes2010
Catch 619.2tonnes2009
Catch 330.5tonnes2008
Catch 340.4tonnes2007
Catch 384.7tonnes2006
Catch 359.4tonnes2005
Catch 503.4tonnes2004
Catch 397.5tonnes2003
Catch 496tonnes2002
Bio Assess
 

Complimentary advice. The basis for advice is a joint assessment of GSAs 1, 5, 6, 7.
Data

The assessment was carried out using official landings and data on the size composition of trawl catches for the years 2003-2019. Catch-at-length data were converted into catch-at-age data by cohort slicing procedures. Length-weight relationship and maturity ogive comes from Spanish DCF.
Assess Models
Type:  Age-structured
XSA

The state of exploitation of this stock was assessed by means of virtual population analysis (VPA) XSA (Shepherd, 1999). The software used was the Lowestoft suite (Darby and Flatman, 1994) and FLR. The XSA tuning was performed using abundance index series from the Mediterranean International Trawl Survey (MEDITS). Yield-per-recruit (Y/R) analyses was conducted based on the exploitation pattern resulting from XSA model and population parameters.
Results

Catches and SSB of European hake show a decreasing trend from 2012 to 2017, with a slight increase in 2018. R showed fluctuations over the series and steep decline in recent years. F bar(0-2) in recent years fluctuates around values close to 1.2.
Sci Advice

Reduce fishing mortality.
Management
Management unit: Yes
Sources
 
FAO. 2021. General Fisheries Commission for the Mediterranean. 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/
Stock assessment form for european hake in GSA 1 (reporting year: 2021). Click to openhttps://gfcmsitestorage.blob.core.windows.net/documents/SAC/SAFs/DemersalSpecies/2019/HKE_GSA_1_2019_ESP.pdf
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
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