Fisheries and Resources Monitoring System

Sea catfishes (Arius spp) - Senegal and Gambia
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Sea catfishes (Arius spp) - Senegal and Gambia
Fact Sheet Citation  
Machoirons (Arius spp) - Sénégal et Gambie
Owned byFood and Agriculture Organization (FAO) – More
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Arius gambiensis
Arius mercatoris
Geographic extent of Sea catfishes (Arius spp) - Senegal and Gambia
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2012
Biological State and Trend
State & Trend Descriptors
Exploitation rateFcur/F0.1 = 69%; Fcur/FMSY = 62%Not applicable
Abundance levelBcur/B0.1 = 121% ; Bcur/BMSY = 134%Not applicable
FAO Categories
Exploitation stateNot fully exploited

Fcur/F0.1: Ratio between the observed fishing mortality coefficient during the last year of the series and F0.1.
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 muddy or muddy-sand.   Depth zone: Coastal (0 m - 50 m); Shelf - Uppershelf (up to 100 m).   Horizontal distribution: Littoral.   Vertical distribution: Demersal/Benthic.  

Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Regional

Geo References
Resource Structure
Considered a single stock: Yes

The Arius spp. catfish group consists of the following species: Arius heudolotii, Arius gambiensis and Arius mercatoris and are distributed across the continental shelf from The Gambia to Senegal. Catfishes are thus considered to be a single stock and the Working Group decided to assess this stock as a single management unit.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 6950tonnes1990
Catch 2671tonnes1991
Catch 5133tonnes1992
Catch 3643tonnes1993
Catch 3482tonnes1994
Catch 3293tonnes1995
Catch 1949tonnes1996
Catch 7671tonnes1997
Catch 7482tonnes1998
Catch 2685tonnes1999
Catch 4146tonnes2000
Catch 6329tonnes2001
Catch 5510tonnes2002
Catch 5153tonnes2003
Catch 6885tonnes2004
Catch 14822tonnes2005
Catch 10120tonnes2006
Catch 7805tonnes2007
Catch 7499tonnes2008
Catch 7594tonnes2009
Catch 6788tonnes2010
Catch 6233tonnes2011
Catch 5657tonnes2012

Assessment year: 2013
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 data used for the model fit were the total catches of catfishes in The Gambia and Senegal. The CPUEs of the ice canoes of the Senegalese artisanal fleet were used to apply the model.
Scientific Advice

As a precaution the Working Group recommends not to increase the fishing mortality above the 2012 level.
Management unit: Yes
Source of information
FAO. 2016a. 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 open
FAO. 2016b. Report of the FAO/CECAF Working Group on the Assessment of Demersal Resources – Subgroup North. Fuengirola, Spain, 18–27 November 2013. / Rapport du Groupe de travail FAO/COPACE sur l’évaluation des ressources démersales – Sousgroupe Nord. Fuengirola, Espagne, 18-27 novembre 2013. CECAF/ECAF Series/COPACE/PACE Séries. No. 15/77. Rome, Italy/Italie.  Click to open
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