Fisheries and Resources Monitoring System

Bonga shad - Gabon, Congo, Democratic Republic of the Congo and Angola
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Bonga shad - Gabon, Congo, Democratic Republic of the Congo and Angola
Fact Sheet Citation  
Ethmalose (Ethmalosa fimbriata) - stock sud (Gabon, Congo, République démocratique du Congo et Angola)
Owned byFood and Agriculture Organization (FAO) – More
Monitoring periodPreviously monitored as: Bonga shad - Southern Area of Eastern Central Atlantic
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Bonga shad, fr - Ethmalose d'Afrique, es - Sábalo africano, ru - Бонга

Fishery Indicators
Production: Catch
Geographic extent of Bonga shad - Gabon, Congo, Democratic Republic of the Congo and Angola
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 = 95% ; Fcur/FMSY = 85%Not applicable
Abundance levelBcur/B0.1 = 114%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/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.
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: Pelagic.  

Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Regional

Geo References
Resource Structure
Considered a single stock: Yes
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 13748tonnes1995
Catch 13657tonnes1996
Catch 15194tonnes1997
Catch 19905tonnes1998
Catch 17938tonnes1999
Catch 15564tonnes2000
Catch 13379tonnes2001
Catch 12241tonnes2002
Catch 12959tonnes2003
Catch 12675tonnes2004
Catch 11425tonnes2005
Catch 12798tonnes2006
Catch 13866tonnes2007
Catch 11180tonnes2008
Catch 11397tonnes2009
Catch 13322tonnes2010
Catch 17984tonnes2011
Catch 17559tonnes2012

Assessment year: 2014
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 CPUE from the artisanal fleet of the Congo (1998–2012) was chosen to fit the model because the series made available to the Working Group was believed to better reflect the variations in the stock. Gabon’s CPUE, which had been used previously, was not available from 2008 to 2102. The estimate of the total catches for the time series of all the countries (the Congo, Gabon and the Democratic Republic of the Congo) in the southern stock from 1998 to 2012 was used. Angola provided no catch data for the species. For the assessment, total catch from the subregion and the CPUE of the artisanal fleet of the Congo for the period 1998 to 2012 was used. The initial parameters for the assessment were: - Ethmalosa fimbriata: r = 0.7, K = 100 000 tonnes and BI/K = 60 percent.
Overall Assessment Results

The CPUE of the Congo shows a decreasing trend in the last for years whereas catches were increasing over the same period. This means that caution has to be applied in the management of this stock. The Working Group stresses the need to provide the necessary information to allow the assessment of the total stock in the future.
Scientific Advice

As a precautionary measure, do not increase catches of this species from the average of the 5 last years (14 000 tonnes).
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 open
FAO. 2015. Report of the FAO/CECAF Working Group on the Assessment of Small Pelagic Fish – Subgroup South. Pointe Noire, Congo, 17–23 March 2014. Rapport du Groupe de travail FAO/COPACE sur l’évaluation des petits poissons pélagiques – Sous-groupe Sud. Pointe Noire, Congo, 17-23 mars 2014. CECAF/ECAF Series / COPACE/PACE Séries No. 15/75 Rome, FAO. 157 pp.  Click to open
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