Fisheries and Resources Monitoring System

Bonga shad - Côte d'Ivoire, Ghana, Togo and Benin
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Bonga shad - Côte d'Ivoire, Ghana, Togo and Benin
Fact Sheet Citation  
Ethmalose (Ethmalosa fimbriata) - stock ouest (Côte d'Ivoire, Ghana, Togo et Bénin)
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 - Côte d'Ivoire, Ghana, Togo and Benin
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2012
Biological State and Trend
State & Trend Descriptors
FAO Categories
Exploitation stateUncertain/Not assessed
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 2367tonnes1990
Catch 1378tonnes1991
Catch 2408tonnes1992
Catch 1138tonnes1993
Catch 573tonnes1994
Catch 1073tonnes1995
Catch 1196tonnes1996
Catch 1610tonnes1997
Catch 314tonnes1998
Catch 758tonnes1999
Catch 978tonnes2000
Catch 314tonnes2001
Catch 334tonnes2002
Catch 150tonnes2003
Catch 312tonnes2004
Catch 329tonnes2005
Catch 748tonnes2006
Catch 211tonnes2007
Catch 1819tonnes2008
Catch 5479tonnes2009
Catch 656tonnes2010
Catch 393tonnes2011
Catch 1028tonnes2012

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 Ghana’s artisanal fleet (1990–2012) was chosen to fit the model because the series made available to the Group were believed to better reflect the variations in the stock. The estimate of the total catches for Côte d’Ivoire, Ghana and Benin from 1990 to 2012 was used. For the western stock, Togo has no catch data for the entire period concerned. Benin, for its part, has no data on the first seven years (1990–96). The Côte d’Ivoire series begins in 1999 with data unavailable in 2007 and 2008. However, the Ghana artisanal fishery series is complete (1990–2012) and that of the coastal fishery is sporadic. Initial parameters for the assessment were: - Ethmalosa fimbriata: r = 0.45, K = 10 000 tonnes and BI/K = 80 percent.
Overall Assessment Results

No reliable result was obtained from the model. The assessment was considered unsatisfactory and therefore rejected. Moreover, the catches show annual fluctuations.
Scientific Advice

No specific recommendation was made due to the uncertainties in the data. Close monitoring of the stock is recommended.

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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