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West African croakers - Senegal and Gambia
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
West African croakers - Senegal and Gambia
Fact Sheet Citation  
Otolithe (Pseudotolithus spp) - Sénégal et Gambie
Owned byFood and Agriculture Organization (FAO) – More
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Species:
Geographic extent of West African croakers - 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
Aq Res State Trend
Exploitation stateUncertain/Not assessed
Habitat and Biology
Climatic zone: Tropical.   Bottom type: Soft bottom clean sand; Soft bottom muddy or muddy-sand; Hard rocky bottom.   Depth zone: Coastal (0 m - 50 m); Shelf - Uppershelf (up to 100 m); Shelf - Edgeshelf.   Horizontal distribution: Neritic.   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


Croakers are mainly distributed and exploited in the southern part of the region: Senegal and The Gambia. The Working Group thus decided to consider them as a shared stock between these two countries and to assess them as a single stock.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 8709tonnes1990
Catch 3965tonnes1991
Catch 2544tonnes1992
Catch 4743tonnes1993
Catch 3598tonnes1994
Catch 2787tonnes1995
Catch 3057tonnes1996
Catch 2939tonnes1997
Catch 5546tonnes1998
Catch 3486tonnes1999
Catch 6080tonnes2000
Catch 5658tonnes2001
Catch 6318tonnes2002
Catch 7176tonnes2003
Catch 5199tonnes2004
Catch 7066tonnes2005
Catch 6270tonnes2006
Catch 3783tonnes2007
Catch 4384tonnes2008
Catch 7200tonnes2009
Catch 4042tonnes2010
Catch 5767tonnes2011
Catch 9674tonnes2012
Assessment
 

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 were the total catch data of the series 1990-2012 of Pseudotholitus spp. from The Gambia and Senegal. The CPUEs of the different segments of industrial and artisanal fleets were tested.
Overall Assessment Results

Despite the repeated tests with different data sets available during the Working Group, the model provides a poor fit. None of the results obtained with the various data sets was conclusive.
Scientific Advice

The assessment not being conclusive due to insufficient catch and effort data available to the Working Group, a precautionary approach is recommended and the fishing mortality should not exceed the 2012 level.
Management
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 openhttp://www.fao.org/3/a-i5301b.pdf
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 openhttp://www.fao.org/3/a-i5114b.pdf
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