Fisheries and Resources Monitoring System

Tonguesole - Gabon, Congo and Democratic Republic of the Congo
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Tonguesole - Gabon, Congo and Democratic Republic of the Congo
Fact Sheet Citation  
Sole (Cynoglossus spp) - Gabon, Congo et République démocratique du Congo
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
Cynoglossus cuneata
Geographic extent of Tonguesole - Gabon, Congo and Democratic Republic of the Congo
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2010
Biological State and Trend
State & Trend Descriptors
FAO Categories
Exploitation stateUncertain/Not assessed
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 adopted two stocks/units for the assessment: one for Gabon-Congo and the Democratic Republic of Congo and one for Angola.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 649tonnes1995
Catch 607tonnes1996
Catch 437tonnes1997
Catch 563tonnes1998
Catch 708tonnes1999
Catch 881tonnes2000
Catch 914tonnes2001
Catch 986tonnes2002
Catch 1130tonnes2003
Catch 984tonnes2004
Catch 820tonnes2005
Catch 715tonnes2006
Catch 745tonnes2007
Catch 470tonnes2008
Catch 588tonnes2009
Catch 445tonnes2010

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
Overall Assessment Results

The results of the model with the data for Cynoglossus spp. for Gabon, Congo, Democratic Republic of Congo and CPUE of the industrial trawlers in Gabon are not satisfactory.
Scientific Advice

As a precautionary measure the catch should not exceed the average of the last 5 years (2006-2010), estimated to be 1 800 tonnes, because the CPUEs are in sharp decline.
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 open
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 open
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