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Lesser African threadfin - Guinea-Bissau and Guinea
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Lesser African threadfin - Guinea-Bissau and Guinea
Fact Sheet Citation  
Petit capitaine (Galeoides decadactylus) - Guinée-Bissau et Guinée
Owned byFood and Agriculture Organization (FAO) – More
Monitoring periodPreviously monitored as: Lesser African threadfin - Guinea
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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 - Guinea-Bissau and Guinea
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2009
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 64% ; Fcur/FMSY = 58%Not applicable
Abundance levelBcur/B0.1 = 131% ; Bcur/BMSY = 144%Not applicable
FAO Categories
Exploitation stateFully exploited

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 Galeoides decadactylus is found primarily in shallow water in Guinea-Bissau and Guinea. This species can be considered as forming a single stock.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 2411tonnes1994
Catch 2790tonnes1995
Catch 3235tonnes1996
Catch 4019tonnes1997
Catch 3119tonnes1998
Catch 4597tonnes1999
Catch 5552tonnes2000
Catch 6825tonnes2001
Catch 6845tonnes2002
Catch 7461tonnes2003
Catch 8160tonnes2004
Catch 8422tonnes2005
Catch 12304tonnes2006
Catch 8915tonnes2007
Catch 4997tonnes2008
Catch 5266tonnes2009
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 total catch of Galeoides decadactylus for Guinea-Bissau and Guinea as well as the abundance indices from scientific surveys carried out in Guinea were used for the period 1997-2009. The catches of Guinea-Bissau were estimated7 for the periods 1998-1999 and 2002-2004. Catches of Guinea for the year 2009 were estimated assuming that exploitation was the same as in 2008. The initial input parameters were, r (intrinsic growth rate) = 2.70; K (initial biomass) = 17 000 and BI/K (biomass of the stock at the beginning of the data series, compared with the initial biomass) = 80 percent.
Overall Assessment Results

The model provides a satisfactory fit to the data. The results of the model indicate that the stock is fully exploited.
Scientific Advice

Not to exceed the 2009 fishing effort. The total catch should not be greater than the average of the last three years (5 000 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
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