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Cunene horse mackerel - Morocco, Mauritania, Senegal and Gambia
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Cunene horse mackerel - Morocco, Mauritania, Senegal and Gambia
Fact Sheet Citation  
Chinchard du Cunène (Trachurus trecae) - Maroc, Mauritanie, Sénégal et Gambie
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 - Morocco, Mauritania, Senegal and Gambia
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2014
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 329%; Fcur/FMSY = 296%Not applicable
Abundance levelBcur/B0.1 = 23% ; Bcur/BMSY = 26%Not applicable
Aq Res State Trend
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: Temperate; Tropical.   Depth zone: Coastal (0 m - 50 m); Shelf - Uppershelf (up to 100 m).   Horizontal distribution: Littoral.   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 59040tonnes1990
Catch 99396tonnes1991
Catch 120131tonnes1992
Catch 105902tonnes1993
Catch 73291tonnes1994
Catch 121697tonnes1995
Catch 90619tonnes1996
Catch 72813tonnes1997
Catch 122632tonnes1998
Catch 83845tonnes1999
Catch 172113tonnes2000
Catch 211983tonnes2001
Catch 153849tonnes2002
Catch 101375tonnes2003
Catch 181621tonnes2004
Catch 272334tonnes2005
Catch 256698tonnes2006
Catch 307042tonnes2007
Catch 401397tonnes2008
Catch 346996tonnes2009
Catch 352344tonnes2010
Catch 257200tonnes2011
Catch 173484tonnes2012
Catch 139664tonnes2013
Catch 222026tonnes2014
Assessment
 

Assessment year: 2015
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 FAO Working Group on the Assessment of Small Pelagic Fish off Northwest Africa prepared the data needed for the application of the dynamic production model. The abundance index applied was that obtained from data provided by Mauritania from the Russian fishery (FAO, 2010). The possible effects of the environment are taken into account based on the anomalies observed in certain years. The initial parameter values (intrinsic growth rate [r] and carrying capacity of the ecosystem [k]) used in fitting the model are presented in Table 4.6.4 (FAO, 2016b).
Overall Assessment Results

Observed and predicted abundance indices for T. trecae using biomass estimates from Russian vessels (operating in the Mauritanian zone), CPUE series and diagnostics of the model is presented in Figure 4.6.4.b (FAO, 2016b). The Pearson correlation coefficient was high (75 percent). Current estimated biomass represents less than one third of the B0.1 (26 percent). The current fishing effort is 70 percent greater than the level that maintains the stock at a sustainable level. The current effort is higher (296 percent) than the one producing a maximum sustainable yield (FMSY) and exceeds by 229 percent the fishing mortality at F0.1 (Table 4.6.6 of FAO, 2016b) [see also "Biological state and trend"]. These results show that the stock of Cunene horse mackerel is overexploited.
Scientific Advice

An increase in catch and effort is observed in 2014 compared to 2013 for both of the Trachurus species. <i>T. trecae</i> remains overexploited whereas <i>T. trachurus</i> is fully exploited. Given the mixed nature of this fishery and the results of the projections, the Working Group, as a precautionary approach, recommends to reduce both effort and catch for the two species.
Management
Management unit: Yes
Source of information
 
FAO. 2016a. 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. 2016b. Report of the FAO Working Group on the Assessment of Small Pelagic Fish off Northwest Africa. Casablanca, Morocco, 20–25 July 2015 / Rapport du Groupe de travail de la FAO sur l’évaluation des petits pélagiques au large de l’Afrique nord-occidentale. Casablanca, Maroc, 20-25 juillet 2015. FAO Fisheries and Aquaculture Report/FAO Rapport sur les pêches et l’aquaculture No. 1122. Rome, Italy/Italie.  Click to openhttp://www.fao.org/3/a-i5511bb.pdf
Bibliography
 
All references to figures, tables and bibliography in the text are found within the source of information.
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