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Bigeye grunt - Congo and Angola
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Bigeye grunt - Congo and Angola
Fact Sheet Citation  
Friture (Brachydeuterus auritus) - Congo et Angola
Owned byFood and Agriculture Organization (FAO) – More
Monitoring periodPreviously monitored as: Bigeye grunt - Cameroon, Gabon, Congo and Angola
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Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Bigeye grunt, fr - Lippu pelon, es - Burro ojón, ru - Отоперка

Fishery Indicators
Production: Catch
Geographic extent of Bigeye grunt - Congo and Angola
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 rateFcur/F0.1 = 308%; Fcur/FMSY = 278%Not applicable
Abundance levelBcur/B0.1 = 42% ; Bcur/BMSY = 46%Not applicable
FAO Categories
Exploitation stateOverexploited

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); Shelf - Uppershelf (up to 100 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
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 524tonnes1995
Catch 800tonnes1996
Catch 229tonnes1997
Catch 934tonnes1998
Catch 934tonnes1999
Catch 1492tonnes2000
Catch 1495tonnes2001
Catch 2164tonnes2002
Catch 1750tonnes2003
Catch 3787tonnes2004
Catch 3962tonnes2005
Catch 3342tonnes2006
Catch 4793tonnes2007
Catch 4309tonnes2008
Catch 3304tonnes2009
Catch 3799tonnes2010
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 catches of Congo and Angola as well as the CPUE of the industrial trawlers in Congo.<br /> The initial input parameters of the model were: r = 1.00; K = 20 000 tonnes; BI/K = 40 percent.<br />
Overall Assessment Results

The results of the assessment show that the stock of Brachydeuterus auritus is overexploited. The results are consistent with the 2008 assessment when the Working Group had used the abundance indices of the surveys the R/V Dr. Fridtjof Nansen carried out in Angola.
Scientific Advice

Reduce the fishing effort and not exceed the level of catches from 2001 to 2003 (2 000 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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