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| Marine Resource Fact Sheet |
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| Common octopus - Dakhla stock (26°N - 21°N) |
 | Poulpe (Octopus vulgaris) - Stock Dakhla (26°N - 21°N) |
| | 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 - Common octopus, fr - Pieuvre, es - Pulpo común |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Common octopus - Dakhla stock (26°N - 21°N)
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| FAO Fishing Statistical Subdivision Areas |
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| 34.1.31 | Atlantic, East central / 34.1.31 |
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| 34.1.32 | Atlantic, East central / 34.1.32 |
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| Main Descriptors | Considered a single stock: Yes
Spatial Scale: Local
Management unit: Yes
Reference year: 2012
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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/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. Bottom type: Hard rocky bottom; Coral reef; Seagrass. Depth zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m). Horizontal distribution: Neritic. Vertical distribution: Demersal/Benthic. Geo References  | | Geographic extent of Common octopus - Dakhla stock (26°N - 21°N)
| FAO Fishing Statistical Subdivision Areas | 34.1.31: Atlantic, East central / 34.1.31 | | 34.1.32: Atlantic, East central / 34.1.32 |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Common octopus - Dakhla stock (26°N - 21°N) Resource Structure Considered a single stock: Yes Three different octopus stocks have been identified in the North CECAF sub-region since the first assessment Working Group held in 1978: - Dakhla Stock (26 °N-21 °N) - Cap Blanc Stock (21 °N-16 °N) - Senegal-Gambia Stock (16 °N-12 °N) This stock identification was based on fishery data that have recently been confirmed using more accurate fishing information, using the vessel monitoring system (VMS) as well as genetic analyses. Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 75602 | tonnes | 1990 | | Catch | 111623 | tonnes | 1991 | | Catch | 90744 | tonnes | 1992 | | Catch | 99987 | tonnes | 1993 | | Catch | 87254 | tonnes | 1994 | | Catch | 78485 | tonnes | 1995 | | Catch | 67626 | tonnes | 1996 | | Catch | 50081 | tonnes | 1997 | | Catch | 71235 | tonnes | 1998 | | Catch | 92584 | tonnes | 1999 | | Catch | 107373 | tonnes | 2000 | | Catch | 80497 | tonnes | 2001 | | Catch | 56781 | tonnes | 2002 | | Catch | 25648 | tonnes | 2003 | | Catch | 17963 | tonnes | 2004 | | Catch | 34208 | tonnes | 2005 | | Catch | 28747 | tonnes | 2006 | | Catch | 30298 | tonnes | 2007 | | Catch | 43491 | tonnes | 2008 | | Catch | 37667 | tonnes | 2009 | | Catch | 27684 | tonnes | 2010 | | Catch | 20865 | tonnes | 2011 | | Catch | 27534 | tonnes | 2012 |
Assessment Assessment year: 2013 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 For the assessment, series of total catches from 2001 to 2012 in tonnes in the zone between 26°N and 20°50’ N for the three Moroccan fleet segments were used. The Working Group used two different series of abundance indices: the CPUEs of the Moroccan deep-sea cephalopod fishery and the abundance indices of trawling surveys conducted in the area between Cap Boujdor and Lguira. For the model fit, the CPUE series was used, Moreover, the results used were those obtained from the abundance indices (scientific surveys) as they better represent the stock biomass. Overall Assessment Results The model provides a good fit between catch and the abundance indices from the scientific surveys as they better represent the actual state of the stock (Figure 5.3.4a of FAO, 2016b) [see also "Biological state and trend"]. The current biomass corresponds to 58 percent of the target biomass B0.1 and the fishing effort for the last year is almost at the same level as that which would produce the biomass B0.1(Table 5.3.4a of FAO, 2016b) [see also "Biological state and trend"]. Scientific Advice It is recommended that fishing effort should not exceed the level of 2012. 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/a-i5301b.pdfFAO. 2016b. Report of the FAO/CECAF Working Group on the Assessment of Demersal Resources – Subgroup North. Fuengirola, Spain, 18–27 November 2013. / Rapport du Groupe de travail FAO/COPACE sur l’évaluation des ressources démersales – Sousgroupe Nord. Fuengirola, Espagne, 18-27 novembre 2013. CECAF/ECAF Series/COPACE/PACE Séries. No. 15/77. Rome, Italy/Italie. http://www.fao.org/3/a-i5114b.pdfBibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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