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Grunts (Pomadasys spp) - Guinea-Bissau and Guinea
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Grunts (Pomadasys spp) - Guinea-Bissau and Guinea
Fact Sheet Citation  
Grondeur (Pomadasys spp) - Guinée-Bissau et Guinée
Owned byFood and Agriculture Organization (FAO) – More
Monitoring periodPreviously monitored as: Sompat grunt - Guinea
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Related observationsLocate in inventorydisplay tree map
 
Species:
Geographic extent of Grunts (Pomadasys spp) - 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 = 82% ; Fcur/FMSY = 74%Not applicable
Abundance levelBcur/B0.1 = 88% ; Bcur/BMSY = 97%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.   Depth zone: Coastal (0 m - 50 m).   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


Pomadasys jubelini and P. incisus are the main species in the group of species Pomadasys spp. which also includes P. rogeri. The three species are found in Guinean and Guinea-Bissau waters. More present in coastal waters than the other two species P. jubelini is important in artisanal fisheries that use purse seine. The Working Group considered a single stock for Pomadasys spp.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 1346tonnes1994
Catch 2218tonnes1995
Catch 2386tonnes1996
Catch 2726tonnes1997
Catch 2783tonnes1998
Catch 2519tonnes1999
Catch 3513tonnes2000
Catch 4352tonnes2001
Catch 3381tonnes2002
Catch 5492tonnes2003
Catch 6235tonnes2004
Catch 9971tonnes2005
Catch 6226tonnes2006
Catch 5584tonnes2007
Catch 2781tonnes2008
Catch 3050tonnes2009
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 initial input parameters were, r (intrinsic growth rate) = 2.00; K (initial biomass) = 90 000 and BI/K (biomass of the stock at the beginning of the data series, compared with the initial biomass) = 50 percent. The data used for the model are those of Guinea and Guinea-Bissau for the period 1990 to 2009. The CPUE observed and adjusted by model is that of the Guinean demersal fish trawlers.
Overall Assessment Results

The model reflects the trends in the Guinean and Guinea-Bissau fisheries. The results indicate that the stock is fully exploited. The assessment by the last Working Group was done with Guinea, Liberia and Sierra Leone. The results indicated that the stock of these three countries was overexploited.
Scientific Advice

Not to increase total effort above the 2009 level. Total catch should not exceed the average of the catches from 2007-2009 (3000 tonnes per year).
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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