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West African croakers - Gabon, Congo, Democratic Republic of the Congo and Angola
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
West African croakers - Gabon, Congo, Democratic Republic of the Congo and Angola
Fact Sheet Citation  
Otolithe (Pseudotolithus spp) - Gabon, Congo, République démocratique du Congo et Angola
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
Geographic extent of West African croakers - Gabon, Congo, Democratic Republic of the Congo and Angola
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2010
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 189%; Fcur/FMSY = 170%Not applicable
Abundance levelBcur/B0.1 = 50% ; Bcur/BMSY = 55%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).   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 a single stock for the assessment concerning Gabon, Congo, the Democratic Republic of Congo and Angola.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 8682tonnes1995
Catch 8342tonnes1996
Catch 7137tonnes1997
Catch 14626tonnes1998
Catch 16680tonnes1999
Catch 13812tonnes2000
Catch 13947tonnes2001
Catch 18543tonnes2002
Catch 23330tonnes2003
Catch 29672tonnes2004
Catch 16848tonnes2005
Catch 24763tonnes2006
Catch 35721tonnes2007
Catch 55643tonnes2008
Catch 38159tonnes2009
Catch 21058tonnes2010
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 Pseudotolithus spp. in Gabon, Congo, the Democratic Republic of Congo and Angola. The abundance indices used were the CPUEs of the demersal trawlers in Angola. The initial input parameters were: r = 0.80; K = 120 000; BI/K = 20 percent.<br />
Overall Assessment Results

The model provides a satisfactory fit to the data from Gabon, Congo, Democratic Republic of Congo and Angola with the CPUE of Angolan industrial trawlers. The previous results indicate that the current biomass of the stock is lower than that which would give a maximum equilibrium yield at the target biomass B0.1, This indicates that the stock is overexploited.
Scientific Advice

Reduce the fishing effort. The total catch should not exceed the average of the last 5 years (32 000 tonnes) for the stock of Gabon, Congo, the Democratic Republic of Congo and Angola.
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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