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| Marine Resource Fact Sheet |
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| Atlantic chub mackerel - Northwest Africa |
 | Maquereau (Scomber colias) - Afrique nord-occidentale |
| | Data Ownership | | This document provided, maintained and owned by Food and Agriculture Organization (FAO) , is part of CECAF Stock Status Reports data collection. |
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| Related observations | Locate in inventory | | | | Species: | | FAO Names: en - Atlantic chub mackerel, fr - Maquereau espagnol atlantique, es - Estornino del Atlántico, ru - Скумбрия японская |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Atlantic chub mackerel - Northwest Africa
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| FAO Fishing Statistical Sub Areas |
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| 34.1 | Northern coastal subarea |
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| FAO Fishing Statistical Subdivision Areas |
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| 34.3.11 | Atlantic, East central / 34.3.11 |
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| 34.3.12 | Atlantic, East central / 34.3.12 |
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| Main Descriptors | Considered a single stock: Yes
Spatial Scale: Regional
Management unit: Yes
Reference year: 2014
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| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| Considered a management unit: An aquatic resource or fishery is
declared as [Fishery] Management Unit if it is
effectively the focus for the application of selected
management methods and measures, within the broader
framework of a management system. According to the FAO
Glossary for Responsible Fishing, "a Fishery Management
Unit (FMU) is a fishery or a portion of a fishery
identified in a Fishery Management Plan (FMP) relevant
to the FMP's management objectives." FMU's may be
organised around fisheries biological, geographic,
economic, technical, social or ecological dimensions ,
and the makeup and attribute of a fishery management
unit depends mainly on the FMP's management
objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g.
"shared", "shared - highly migratory") of the aquatic
resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic
resource according to the environmental group (e.g.
pelagic invertebrate, or demersal fish) to which the
species belong. |
| Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | | | Biological State and Trend Fcur/F0.1: Ratio between the observed fishing mortality coefficient during the last year of the series and F0.1. Fcur/FSYcur: Ratio between the observed fishing mortality coefficient during the last year of the series and the coefficient that would give a sustainable yield at the current biomass level. 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: Temperate; Tropical. Depth zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m); Slope (200 m - 1000 m). Horizontal distribution: Neritic; Oceanic. Vertical distribution: Pelagic. Geographical Distribution Jurisdictional distribution: Shared between nations Geo References  | | Geographic extent of Atlantic chub mackerel - Northwest Africa
| FAO Fishing Statistical Sub Areas | 34.1: Northern coastal subarea | | FAO Fishing Statistical Subdivision Areas | 34.3.11: Atlantic, East central / 34.3.11 | | 34.3.12: Atlantic, East central / 34.3.12 |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Atlantic chub mackerel - Northwest Africa Resource Structure Considered a single stock: Yes The Working Group maintained the assumption of two stocks of chub mackerel (Scomber colias): the northern stock between Cape Bojador and the north of Morocco in the Atlantic, and the southern stock between Cape Bojador and the south of Senegal. Nevertheless, owing to a lack of more information on migration and possible exchanges between the two stocks, the Working Group since its 2003 meeting has proceeded with a joint assessment of the two stocks in its general distribution area. Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 49295 | tonnes | 1990 | | Catch | 20052 | tonnes | 1991 | | Catch | 35867 | tonnes | 1992 | | Catch | 41711 | tonnes | 1993 | | Catch | 92445 | tonnes | 1994 | | Catch | 147174 | tonnes | 1995 | | Catch | 184936 | tonnes | 1996 | | Catch | 214357 | tonnes | 1997 | | Catch | 205056 | tonnes | 1998 | | Catch | 142383 | tonnes | 1999 | | Catch | 191727 | tonnes | 2000 | | Catch | 158585 | tonnes | 2001 | | Catch | 136557 | tonnes | 2002 | | Catch | 182237 | tonnes | 2003 | | Catch | 222784 | tonnes | 2004 | | Catch | 182050 | tonnes | 2005 | | Catch | 206266 | tonnes | 2006 | | Catch | 257544 | tonnes | 2007 | | Catch | 268325 | tonnes | 2008 | | Catch | 243931 | tonnes | 2009 | | Catch | 224608 | tonnes | 2010 | | Catch | 321941 | tonnes | 2011 | | Catch | 226726 | tonnes | 2012 | | Catch | 278425 | tonnes | 2013 | | Catch | 343906 | tonnes | 2014 |
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 catch data used by the Working Group were the total catch series of the whole sub-region for the period 1999–2014. Previously the biomass indices used for the model run have been the acoustic biomasses from the “Nansen series”, initiated by the RV DR. FRIDTJOF NANSEN, started in 1999 and continued by the national research vessels. However, as no coordinated acoustic survey has been carried out since 2011, no value for this index was reported to the Working Group in 2014. Thus, the Group proceeded with a model run using the standardized CPUE series from Russia. The Russian CPUEs for 2012 were not used because the 2012 index was only for the month of December and was not representative of the annual index. The initial parameters for the carrying capacity K and the intrinsic growth rate r used as starting points for the model runs were the following: - Intrinsic growth rate r = 1.55 - Carrying capacity K (in thousands of tonnes) = 602 Assessment Model Type: Age-structured Length Cohort Analysis (LCA) Extended Survivor Analysis (XSA) Overall Assessment Results The adjustment of Russian CPUEs for the year 2014 was considered satisfactory by the Working Group for the stock assessment using the Schaefer dynamic production model. The current stock biomass is 35 percent higher than the target biomass B0.1. The current Fishing Mortality is more or less the same as equal to F0.1 and slightly below the level of FMSY. The combination of these results show that the chub mackerel stock is fully exploited. Scientific Advice The Working Group adopted, based on the results of both the production model and the analytical model that the stock is fully exploited. The Working Group recommends not to exceed the mean level over the last five years 280 000 tonnes in 2014 for the whole sub-region. 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.  http://www.fao.org/3/I5301Bi/i5301bi.pdfFAO. 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. http://www.fao.org/3/a-i5511bb.pdf |
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