Fisheries and Resources Monitoring System

Cunene horse mackerel - Guinea-Bissau, Guinea, Sierra Leone and Liberia
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Cunene horse mackerel - Guinea-Bissau, Guinea, Sierra Leone and Liberia
Fact Sheet Citation  
Chinchard du Cunène (Trachurus trecae) - stock nord (Guinée-Bissau, Guinée, Sierra Leone et Libéria)
Owned byFood and Agriculture Organization (FAO) – More
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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 - Guinea-Bissau, Guinea, Sierra Leone and Liberia
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 = 77% ; Fcur/FMSY = 69%Not applicable
Abundance levelBcur/B0.1 = 71% ; Bcur/BMSY = 78%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
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 21669tonnes1990
Catch 17748tonnes1991
Catch 524tonnes1992
Catch 5840tonnes1993
Catch 5627tonnes1994
Catch 8122tonnes1995
Catch 5207tonnes1996
Catch 13763tonnes1997
Catch 4440tonnes1998
Catch 2828tonnes1999
Catch 11388tonnes2000
Catch 11402tonnes2001
Catch 5055tonnes2002
Catch 13527tonnes2003
Catch 16259tonnes2004
Catch 32363tonnes2005
Catch 21879tonnes2006
Catch 11079tonnes2007
Catch 20137tonnes2008
Catch 25262tonnes2009
Catch 22014tonnes2010
Catch 14333tonnes2011
Catch 11687tonnes2012

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 on the total catches of Trachurus trecae (Cunene horse mackerel) in Guinea-Bissau, Guinea and Liberia were used for the period 1997–2012. Catches for Guinea-Bissau for the period 1998–1999 were not available. Data for Sierra Leone were not available. The abundance indices used were the CPUEs from pelagic trawlers in Guinea. The Working Group considered that these data better reflect the abundance of this group of species than the CPUEs from the other types of fleets from the two countries. The values of the initial parameters were: - Trachurus trecae northern stock: r = 0.45, K = 130 000 tonnes and BI/K = 60 percent.
Overall Assessment Results

The adjustment of the model to the Trachurus trecae data was considered satisfactory. The results show that the Trachurus trecae stock is overexploited even though last year’s catches were low compared with those of the last ten years. If the fishing effort remains at this level with the same environmental conditions, an increase in the biomass can be expected next year. However, catch data from Guinea-Bissau were not available for the period 1998-99. The adjustment could have better reflected the actual situation if these data had been made available. The results of the model indicate that the stock is overexploited.
Scientific Advice

Catch last year low compared to catches over the last 10 years. As a precautionary measure, do not increase catches of this species above the 2012 level (10 000 tonnes) to allow the stock to grow.
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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