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Cunene horse mackerel - Gabon, Congo, Democratic Republic of the Congo and Angola
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Cunene horse mackerel - Gabon, Congo, Democratic Republic of the Congo and Angola
Fact Sheet Citation  
Chinchard du Cunène (Trachurus trecae) - stock sud (Gabon, Congo, République démocratique du Congo et Angola)
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Cunene horse mackerel, fr - Chinchard du Cunène, es - Jurel de Cunene, ru - Ставрида западноафриканская

Fishery Indicators
Production: Catch
Geographic extent of Cunene horse mackerel - 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
PartnerFIRMS
Exploitation rateFcur/F0.1 = 92% ; Fcur/FMSY = 83%Not applicable
Abundance levelBcur/B0.1 = 43% ; Bcur/Bmsy = 48%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/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).   Horizontal distribution: Neritic.   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
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 64928tonnes1990
Catch 34573tonnes1991
Catch 31475tonnes1992
Catch 43970tonnes1993
Catch 29459tonnes1994
Catch 21839tonnes1995
Catch 48042tonnes1996
Catch 54135tonnes1997
Catch 43480tonnes1998
Catch 26284tonnes1999
Catch 40246tonnes2000
Catch 46347tonnes2001
Catch 38731tonnes2002
Catch 34419tonnes2003
Catch 3013tonnes2004
Catch 5707tonnes2005
Catch 15822tonnes2006
Catch 15056tonnes2007
Catch 44453tonnes2008
Catch 16255tonnes2009
Catch 2733tonnes2010
Catch 5651tonnes2011
Catch 39210tonnes2012
Assessment
 

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 input data were the total catch data of Trachurus trecae for the period 1990–2012 for the four countries (Angola, Congo, DR Congo, Gabon). The following data were used to estimate the total catch: the artisanal fisheries for Gabon (2003–08), Democratic Republic of the Congo (1999–2012), Congo (1995–2005) and artisanal (1997–2012), purse seiners (1990–2012), pelagic trawlers (1998–2004) and demersal trawlers (1998–2011) for Angola. The CPUE used was the acoustic surveys’ abundance index estimated by R/V Dr. Fridtjof Nansen (1990–2012) in Angola (June–July surveys). The initial parameters were: - Trachurus trecae southern stock: r = 0.45, K = 400 000 tonnes and BI/K = 60 percent.
Overall Assessment Results

The model provides a reasonably good fit to the data available. The model shows that the stock is overexploited. However, the catches of this species are not fully recorded. Survey data show a general decreasing trend over the time series until 2011, followed by an increase in biomass for 2012 and 2013. Currently, the fishing mortality is lower than what would produce a sustainable yield at the current biomass level, which could lead to an improved situation if the general conditions remain stable.
Scientific Advice

Survey data shows a general decreasing trend over the time series until 2011, followed by an increase in biomass for 2012 and 2013. Catch levels of this species should not be increased to allow the stock to recover.
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 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 openhttp://www.fao.org/3/a-i5040b.pdf
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