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Tonguesole - Guinea-Bissau and Guinea
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Tonguesole - Guinea-Bissau and Guinea
Fact Sheet Citation  
Sole (Cynoglossus spp) - Guinée-Bissau et Guinée
Owned byFood and Agriculture Organization (FAO) – More
Monitoring periodPreviously monitored as: Toungesole - Guinea
.
Related observationsLocate in inventorydisplay tree map
 
Species:
Geographic extent of Tonguesole - Guinea-Bissau and Guinea
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2009
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 41% ; Fcur/FMSY = 37% ;Not applicable
Abundance levelBcur/B0.1 = 140% ; Bcur/BMSY = 154%Not applicable
FAO Categories
Exploitation stateNot fully exploited

Fcur/F0.1: Ratio between the observed fishing mortality coefficient during the last year of the series and F0.1.
Fcur/FSYcur: Ratio between the observed fishing mortality coefficient during the last year of the series and the coefficient that would give a sustainable yield at the current biomass level.
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: Soft bottom clean sand; Soft bottom muddy or muddy-sand.   Depth zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m).   Vertical distribution: Demersal.  

Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Regional

Geo References
Resource Structure
Considered a single stock: Yes


The Working Group considered one stock of Cynoglossus spp. for the two countries.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 4083tonnes1994
Catch 6475tonnes1995
Catch 6091tonnes1996
Catch 8955tonnes1997
Catch 6949tonnes1998
Catch 6865tonnes1999
Catch 9450tonnes2000
Catch 10383tonnes2001
Catch 8564tonnes2002
Catch 9723tonnes2003
Catch 10929tonnes2004
Catch 14417tonnes2005
Catch 8325tonnes2006
Catch 11521tonnes2007
Catch 5168tonnes2008
Catch 5350tonnes2009
Assessment
 

Assessment year: 2011
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 initial parameter values were: r (intrinsic growth rate) = 1.00; K (initial biomass) = 25 000 and BI/K (biomass of the stock at the beginning of the series of data, compared with the initial biomass) = 40 percent.
Overall Assessment Results

The model provides a reasonably good fit to the data with modification of the environment value 1 in 2000 and -1 in 2006. The model reflects the trends in the fisheries of Guinea and Guinea-Bissau. The results indicate that the stock is not fully exploited.
Scientific Advice

As a precautionary measure not to increase fishing effort as a series of more complete and better quality data are not available. The catch should not exceed the 2008 level (5 000 tonnes).
Management
Management unit: Yes
Source of information
 
FAO. 2016. 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. 2015. Report of the FAO/CECAF Working Group on the Assessment of Demersal Resources – Subgroup South. Accra, Ghana, 15–24 November 2011 / Rapport du Groupe de travail FAO/COPACE sur l’évaluation des ressources démersales – Sous-groupe Sud. Accra, Ghana, 15-24 novembre 2011. CECAF/ECAF Series/COPACE/PACE Séries. No. 15/76. Rome, Italy/Italie.  Click to openhttp://www.fao.org/3/a-i5138b.pdf
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