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European hake - Morocco
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
European hake - Morocco
Fact Sheet Citation  
Merlu blanc (Merluccius merluccius) - Maroc; White hake (Merluccius merluccius) - Morocco
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - European hake, fr - Merlu européen, es - Merluza europea, ru - Мерлуза восточноатлантическая

Fishery Indicators
Production: Catch
Geographic extent of European hake - Morocco
Main Descriptors
Considered a single stock: Yes        Spatial Scale: National
Management unit: Yes        Reference year: 2012
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 109%; Fcur/FMSY = 98%Not applicable
Abundance levelBcur/B0.1 = 96% ; Bcur/BMSY = 106%Not applicable
Aq Res State Trend
Exploitation stateOverexploited

Fcur/F0.1: Ratio between the observed fishing mortality coefficient during the last year of the series and F0.1.
Fcur/FMSY: Ratio between the observed fishing mortality coefficient during the last year of the series and the coefficient that would give a maximum sustainable yield over the long term.
Bcur/B0.1: Ratio between the estimated biomass for the last year and the biomass corresponding to F0.1.
Bcur/BMSY: Ratio between the estimated biomass for the last year and the biomass corresponding to FMSY.
Unless otherwise indicated, the indicators were based on the Schaefer dynamic production stock assessment model.
Habitat and Biology
Climatic zone: Temperate.   Depth zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m); Slope (200 m - 1000 m).   Horizontal distribution: Neritic; Oceanic.   Vertical distribution: Demersal/Benthic.  

Geographical Distribution
Jurisdictional distribution: National

Water Area Overview
Spatial Scale: National

Geo References
Resource Structure
Considered a single stock: Yes


The population of white hake in Morocco is considered to be a single stock.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 2728tonnes1980
Catch 5724tonnes1981
Catch 7156tonnes1982
Catch 7269tonnes1983
Catch 6634tonnes1984
Catch 8635tonnes1985
Catch 12094tonnes1986
Catch 12933tonnes1987
Catch 10517tonnes1988
Catch 9184tonnes1989
Catch 9902tonnes1990
Catch 11656tonnes1991
Catch 13375tonnes1992
Catch 10766tonnes1993
Catch 9759tonnes1994
Catch 8359tonnes1995
Catch 9310tonnes1996
Catch 7540tonnes1997
Catch 4817tonnes1998
Catch 5391tonnes1999
Catch 3297tonnes2000
Catch 4897tonnes2001
Catch 6355tonnes2002
Catch 11314tonnes2003
Catch 10036tonnes2004
Catch 8745tonnes2005
Catch 5623tonnes2006
Catch 5981tonnes2007
Catch 4209tonnes2008
Catch 5388tonnes2009
Catch 3835tonnes2010
Catch 3722tonnes2011
Catch 5137tonnes2012
Assessment
 

Assessment year: 2013
The CECAF Working Groups have adopted the following Biological Reference Points (BRPs):
- Limit Reference points: BMSY and FMSY
- Target Reference Points: B0.1 and F0.1
Stock status is assigned based on current estimates of fishing mortality (Fcur) and biomass (Bcur) relative to these target and limit reference points (Bcur/BMSY, Fcur/FMSY, Bcur/B0.1, Fcur/F0.1). The results from the stock assessment of this stock are found under the “Biological state and trend section”.
Assessment Model
Type:  Biomass-aggregated
Schaefer dynamic production model

Three assessment tests were done using the global production model: - A first test with the total catch from 1995 to 2012 and the series of abundance indices of white hake obtained from scientific surveys carried out from 1995 to 2012 (with model estimations for abundance indices for 2008 and 2009); - A second test using the same series of catches and abundance indices from scientific surveys but by reducing the representativeness of some years for which there were large fluctuations in the abundance indices; - A third test using the complete series of catches and CPUEs of the coastal fishery from 1990 to 2012; The first test was retained and adopted by the Working Group. The fit of the model was done taking into account the environmental effect during the period 1997-2000 on the stock abundance, in line with the results of studies on the impact of the North Atlantic Oscillation (NAO) on the abundance of hake carried out by the IEO team (Meiners, 2007; Meiners et al., 2006; 2007).
Assessment Model
Type:  Size-structured
Length Cohort Analysis (LCA)
Yield per Recruit Analysis (Y/R)
Overall Assessment Results

The Schaefer dynamic production model fits well with the series of abundance indices of the scientific surveys (Figure 2.3.4a of FAO, 2016b). The fit of the model was done taking into account the environmental effect during the period 1997-2000 on the stock abundance, in line with the results of studies on the impact of the North Atlantic Oscillation (NAO) on the abundance of hake carried out by the IEO team (Meiners, 2007; Meiners et al., 2006; 2007). The Working Group adopted the results as it’s the series that best represents the real abundance of the stock, since the scientific surveys cover the whole distribution area of the species. The results of the assessments indicate that the white hake stock is fully exploited in terms of biomass but slightly overexploited in terms of fishing mortality, with catches exceeding the natural production of the stock (Table 2.3.4a of FAO, 2016b) [see also "Biological state and trend"]. The current fishing mortality is slightly higher than the target fishing mortality F0.1 and the fishing mortality that would correspond to the sustainable biomass. The results of the two LCA and yield per recruit analytic models indicate a overexploitation of the white hake stock (Figure 2.3.4b and c of FAO, 2016b)). The current fishing mortality is high for the juveniles and young individuals and far exceeds the maximum and target fishing mortalities .
Scientific Advice

It is recommended to reduce the current fishing mortality by 10 percent compared with 2012 of the coastal trawler fishery which targets the juveniles.
Management
Management unit: Yes
Source of information
 
FAO. 2016a. Fishery Committee for the Eastern Central Atlantic, Report of the seventh session of the Scientific Sub-Committee, Tenerife, Spain, 14–16 October 2015 / Comité des pêches pour l’Atlantique Centre-Est Rapport de la septième session du Sous-Comité scientifique. Tenerife, Espagne 14-16 octobre 2015. FAO Fisheries and Aquaculture Report / FAO Rapport sur les pêches et l’aquaculture No. 1128. Rome, Italy.  Click to openhttp://www.fao.org/3/a-i5301b.pdf
FAO. 2016b. Report of the FAO/CECAF Working Group on the Assessment of Demersal Resources – Subgroup North. Fuengirola, Spain, 18–27 November 2013. / Rapport du Groupe de travail FAO/COPACE sur l’évaluation des ressources démersales – Sousgroupe Nord. Fuengirola, Espagne, 18-27 novembre 2013. CECAF/ECAF Series/COPACE/PACE Séries. No. 15/77. Rome, Italy/Italie.  Click to openhttp://www.fao.org/3/a-i5114b.pdf
Bibliography
 
All references to figures, tables and bibliography in the text are found within the source of information.
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