Fisheries and Resources Monitoring System

White grouper - Mauritania, Senegal and Gambia
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
White grouper - Mauritania, Senegal and Gambia
Fact Sheet Citation  
Merou (Epinephelus aeneus) - Mauritanie, Sénégal et Gambie; Thiof (Epinephelus aeneus) - Mauritania, Senegal and Gambia
Owned byFood and Agriculture Organization (FAO) – More
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FAO Names: en - White grouper, fr - Mérou blanc, es - Cherna de ley

Fishery Indicators
Production: Catch
Geographic extent of White grouper - Mauritania, Senegal and Gambia
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2012
Biological State and Trend
State & Trend Descriptors
Exploitation rateFcur/F0.1 = 762%; Fcur/FMSY = 677%Not applicable
Abundance levelBcur/B0.1 = 34% ; Bcur/BMSY = 38%Not applicable
FAO Categories
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: Tropical.   Bottom type: Hard rocky bottom; Soft bottom clean sand.   Depth zone: Coastal (0 m - 50 m); Shelf - Uppershelf (up to 100 m); Shelf - Edgeshelf.   Horizontal distribution: Neritic.   Vertical distribution: Demersal/Benthic.  

Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Regional

Geo References
Resource Structure
Considered a single stock: Yes

For Epinephelus aeneus, a single management unit was identified for the three countries (Mauritania, Senegal and The Gambia).
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 2541tonnes1990
Catch 2905tonnes1991
Catch 2516tonnes1992
Catch 3196tonnes1993
Catch 2988tonnes1994
Catch 3280tonnes1995
Catch 3326tonnes1996
Catch 2709tonnes1997
Catch 2187tonnes1998
Catch 2476tonnes1999
Catch 2431tonnes2000
Catch 2436tonnes2001
Catch 2229tonnes2002
Catch 2125tonnes2003
Catch 1698tonnes2004
Catch 1875tonnes2005
Catch 1722tonnes2006
Catch 1381tonnes2007
Catch 2036tonnes2008
Catch 2136tonnes2009
Catch 2976tonnes2010
Catch 2715tonnes2011
Catch 3413tonnes2012

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

For input catch data, the Working Group collated total catches of all the fleets of the three countries (Mauritania, Senegal and Gambia). In this Working Group a catch series from the artisanal fishery in Mauritania was provided and taken into account. For the abundance index series, the CPUE series of the ice canoes of the Senegalese artisanal fishery was an input in the model.
Scientific Advice

The Working Group recommends a reduction in fishing mortality.
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 open
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 open
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