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Lesser African threadfin - Gabon, Congo, Democratic Republic of the Congo and Angola
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Lesser African threadfin - Gabon, Congo, Democratic Republic of the Congo and Angola
Fact Sheet Citation  
Petite capitaine (Galeoides decadactylus) - Gabon, Congo, République démocratique du Congo et Angola
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Lesser African threadfin, fr - Petit capitaine, es - Barbudo enano africano

Fishery Indicators
Production: Catch
Geographic extent of Lesser African threadfin - 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 = 196%; Fcur/FMSY = 176%Not applicable
Abundance levelBcur/B0.1 = 51% ; Bcur/BMSY = 56%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).   Horizontal distribution: Littoral.   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 that Galeoides decadactylus of Gabon, Congo, Democratic Republic of Congo and Angola can form a single stock/unit for the assessment.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 2825tonnes1995
Catch 4211tonnes1996
Catch 3265tonnes1997
Catch 4287tonnes1998
Catch 4316tonnes1999
Catch 4065tonnes2000
Catch 4322tonnes2001
Catch 5067tonnes2002
Catch 3780tonnes2003
Catch 4403tonnes2004
Catch 2493tonnes2005
Catch 2372tonnes2006
Catch 1772tonnes2007
Catch 9230tonnes2008
Catch 12639tonnes2009
Catch 8045tonnes2010
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 Galeoides decadactylus in Gabon, Congo, and Angola for the years 1998-2010 (Table5.4.3 of FAO, 2015). The data for the Democratic Republic of Congo were not included in the analysis because they were not reliable. The abundance indices used were the CPUE series of demersal trawlers in Angola (Table 4.4.3c of FAO, 2015). The initial input parameters of the model were as follows: r = 1.00; K = 15 000 and BI/K = 40 percent.
Overall Assessment Results

The model provides a good fit to the data for Gabon, Congo and Angola (Figure 5.4.4 of FAO 2015).
Scientific Advice

Reduce fishing effort. The total catch should not exceed the average of the last 5 years Gabon, Congo, and Angola stock (4 300 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
Bibliography
 
All references to figures, tables and bibliography in the text are found within the source of information.
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