Fisheries and Resources Monitoring System

Common octopus - Cap Blanc stock (21°N - 16°N)
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Common octopus - Cap Blanc stock (21°N - 16°N)
Fact Sheet Citation  
Poulpe (Octopus vulgaris) - Stock Cap Blanc (21°N - 16°N)
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
FAO Names: en - Common octopus, fr - Pieuvre, es - Pulpo común

Fishery Indicators
Production: Catch
Geographic extent of Common octopus - Cap Blanc stock (21°N - 16°N)
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Local
Management unit: Yes        Reference year: 2012
Biological State and Trend
State & Trend Descriptors
Exploitation rateFcur/F0.1 = 130% ; Fcur/FMSY = 117%Not applicable
Abundance levelBcur/B0.1 = 84% ; Bcur/BMSY = 92%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.   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.  

Water Area Overview
Spatial Scale: Local

Geo References
Resource Structure
Considered a single stock: Yes

Three different octopus stocks have been identified in the 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)
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 22848tonnes1990
Catch 29351tonnes1991
Catch 44626tonnes1992
Catch 38236tonnes1993
Catch 27037tonnes1994
Catch 25786tonnes1995
Catch 29593tonnes1996
Catch 17968tonnes1997
Catch 17415tonnes1998
Catch 22156tonnes1999
Catch 28896tonnes2000
Catch 28227tonnes2001
Catch 22600tonnes2002
Catch 20195tonnes2003
Catch 25072tonnes2004
Catch 29643tonnes2005
Catch 21612tonnes2006
Catch 24964tonnes2007
Catch 32014tonnes2008
Catch 36615tonnes2009
Catch 17953tonnes2010
Catch 21985tonnes2011
Catch 29982tonnes2012

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

The data series of total catches from 1990 to 2012 is highly heterogeneous in terms of the catch level and data quality. During the period 1990-1995, the catches were relatively high compared with the period 1996-2006. The series from 1999 to 2008 was used for the analysis, because the exploitation level seems more homogeneous during this period. The CPUEs used in the model are those of the Mauritanian ice trawlers.
Scientific Advice

The Working Group recommends not exceeding the 2012 fishing mortality.
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 open
FAO. 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.  Click to open
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