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Large-eye dentex - Morocco, Mauritania, Senegal and Gambia
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Large-eye dentex - Morocco, Mauritania, Senegal and Gambia
Fact Sheet Citation  
Denté à gros yeux (Dentex macrophthalmus) - Maroc, Mauritanie, Sénégal et Gambie
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Large-eye dentex, fr - Denté à gros yeux, es - Cachucho, ru - Зубан большеглазый

Fishery Indicators
Production: Catch
Geographic extent of Large-eye dentex - Morocco, 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
Aq Res State Trend
Exploitation stateUncertain/Not assessed
Habitat and Biology
Climatic zone: Temperate; Tropical.   Bottom type: Hard rocky bottom.   Depth zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m); Slope - Upperslope (200 m - 500 m).   Horizontal distribution: Neritic; Oceanic.   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


The large eye dentex is found in Morocco, Mauritania, Senegal and The Gambia. Due to the lack of detailed information, the Working Group decided to consider a single stock for the whole region.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 1538tonnes1990
Catch 2548tonnes1991
Catch 3022tonnes1992
Catch 2546tonnes1993
Catch 2803tonnes1994
Catch 3476tonnes1995
Catch 5285tonnes1996
Catch 5267tonnes1997
Catch 4681tonnes1998
Catch 2970tonnes1999
Catch 4835tonnes2000
Catch 4933tonnes2001
Catch 4726tonnes2002
Catch 2309tonnes2003
Catch 5162tonnes2004
Catch 5292tonnes2005
Catch 3461tonnes2006
Catch 4369tonnes2007
Catch 3984tonnes2008
Catch 9347tonnes2009
Catch 8151tonnes2010
Catch 4960tonnes2011
Catch 4032tonnes2012
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

The catch series of Dentex macrophtalmus for Mauritania, Senegal and The Gambia as well as the abundance indices from the surveys in Mauritania were used for the model. Many countries do not separate the different dentex species from the other sparid species in their catches. It is therefore possible that data provided for this species can actually be for one of the two dentex species and this can lead to the disparities observed in the reported and actual catches. Several other abundance species were taken into account by the Working Group, but as Dentex macrophtalmus is not a targeted species and the juveniles are found mainly in shallow waters, it is estimated that none of the other indices available provided reliable information on the abundance of this species. However, the abundance index of Mauritanian fishing vessels was used as index for this species.
Overall Assessment Results

The available data were not sufficient to obtain conclusive results for the assessment of Dentex macrophtalmus. The model does not provide a reasonable fit to the data. It is difficult to explain the high catches when the abundance index of the past few years is very low. Although no result has been obtained from the model, care should be taken in the management of this species because the abundance index from the Mauritanian survey is very low for this species.
Scientific Advice

The quality of the fit does not allow for a very precise conclusion on the state of the stock. However, due to the low catches observed in recent years during the surveys in Mauritania, a precautionary approach would be not to exceed the 2012 fishing mortality.
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
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