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Lesser African threadfin - Nigeria, Cameroon, Equatorial Guinea and São Tomé e Príncipe
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Lesser African threadfin - Nigeria, Cameroon, Equatorial Guinea and São Tomé e Príncipe
Fact Sheet Citation  
Petit capitaine (Galeoides decadactylus) - Nigéria, Cameroun, Guinée équatoriale et Sao Tomé-et-Principe
Owned byFood and Agriculture Organization (FAO) – More
Monitoring periodPreviously monitored as: Lesser African threadfin - Cameroon
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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 - Nigeria, Cameroon, Equatorial Guinea and São Tomé e Príncipe
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 rateUncertain/Not assessedNot applicable
Abundance levelBcur/B0.1 = 76% ; Bcur/BMSY = 84%Not applicable
FAO Categories
Exploitation stateUncertain/Not assessed

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 for assessments proposes a single stock/unit of Galeoides decadactylus for Nigeria, Cameroon, Equatorial Guinea and Sao Tome & Principe.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 330tonnes1990
Catch 507tonnes1991
Catch 543tonnes1992
Catch 333tonnes1993
Catch 33tonnes1994
Catch 2189tonnes1995
Catch 6124tonnes1996
Catch 9788tonnes1997
Catch 2343tonnes1998
Catch 3031tonnes1999
Catch 4286tonnes2000
Catch 5218tonnes2001
Catch 4999tonnes2002
Catch 6738tonnes2003
Catch 5041tonnes2004
Catch 4501tonnes2005
Catch 6678tonnes2006
Catch 4913tonnes2007
Catch 6042tonnes2008
Catch 5917tonnes2009
Catch 5257tonnes2010
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 catch of Galeoides decadactylus reported from the four countries during the years 2002-2010 and also for three countries (Nigeria, Cameroon and Equatorial Guinea). The abundance indices used were the series of CPUE of demersal trawlers in Cameroon for both trials.
Overall Assessment Results

The model did not provide a good fit to the data used from all the countries with the CPUE from Cameroon.
Scientific Advice

As a precautionary measure and pending more complete information, the Working Group recommends not increasing fishing effort for Nigeria, Cameroon and Equatoral Guinea and Sao Tome & Principe. These fisheries should be monitored carefully.
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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