Fisheries and Resources Monitoring System

Tonguesole - Nigeria and Cameroon
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Tonguesole - Nigeria and Cameroon
Fact Sheet Citation  
Sole (Cynoglossus spp) - Nigéria et Cameroun
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
Cynoglossus cuneata
Geographic extent of Tonguesole - Nigeria and Cameroon
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 one stock/unit for Nigeria and Cameroon for assessment purpose as they have data series from 1995 to 2010. Only Equatorial Guinea also provided data, but from 2002 to 2010.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 490tonnes1990
Catch 551tonnes1991
Catch 726tonnes1992
Catch 912tonnes1993
Catch 561tonnes1994
Catch 2799tonnes1995
Catch 1789tonnes1996
Catch 1686tonnes1997
Catch 2279tonnes1998
Catch 4599tonnes1999
Catch 7292tonnes2000
Catch 7234tonnes2001
Catch 2913tonnes2002
Catch 7525tonnes2003
Catch 6641tonnes2004
Catch 9054tonnes2005
Catch 8398tonnes2006
Catch 7564tonnes2007
Catch 8123tonnes2008
Catch 6610tonnes2009
Catch 8828tonnes2010

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 Working Group used the total catch of Cynoglossus spp. for Nigeria and Cameroon with data series starting from 1995 to 2010. The abundance indices used are the series of CPUE of industrial trawlers from Cameroon.
Overall Assessment Results

The model fit was not satisfactory and therefore the Working Group did not use the data from the Nigeria and Cameroon.
Scientific Advice

As a precautionary approach, the Working Group recommends for Cynoglossus spp in Nigeria and Cameroon, a reduction in fishing efforts due to high effort in 2010, and that the fisheries should be closely monitored.
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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