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Tonguesole - Angola
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Tonguesole - Angola
Fact Sheet Citation  
Sole (Cynoglossus spp) - Angola
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
Cynoglossus cuneata
Geographic extent of Tonguesole - Angola
Main Descriptors
Considered a single stock: Yes        Spatial Scale: National
Management unit: Yes        Reference year: 2010
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 191%; Fcur/FMSY = 172%Not applicable
Abundance levelBcur/B0.1 = 67% ; Bcur/BMSY = 74%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/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: National

Water Area Overview
Spatial Scale: National

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.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 473tonnes1995
Catch 522tonnes1996
Catch 1545tonnes1997
Catch 1271tonnes1998
Catch 904tonnes1999
Catch 962tonnes2000
Catch 1503tonnes2001
Catch 715tonnes2002
Catch 831tonnes2003
Catch 1087tonnes2004
Catch 435tonnes2005
Catch 479tonnes2006
Catch 390tonnes2007
Catch 528tonnes2008
Catch 682tonnes2009
Catch 767tonnes2010
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 Working Group used the total catches of Cynoglossus spp. for Angola. The abundance indices used are the CPUE series for the industrial trawlers in Angola. The initial input parameters were as follows: r = 1.00; K = 6 000 tonnes and BI/K = 40 percent.
Scientific Advice

Reduce fishing effort. The total catch should not exceed the average of the last 5 years (600 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/I5301Bi/i5301bi.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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