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Common octopus - Guinea-Bissau
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Common octopus - Guinea-Bissau
Fact Sheet Citation  
Octopus (Octopus vulgaris) - Guinée-Bissau
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Common octopus, fr - Pieuvre, es - Pulpo común

Fishery Indicators
Production: Catch
Geographic extent of Common octopus - Guinea-Bissau
Main Descriptors
Considered a single stock: Yes        Spatial Scale: National
Management unit: Yes        Reference year: 2010
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 19%; Fcur/FMSY = 17%Not applicable
Abundance levelBcur/B0.1 = 136% ; Bcur/BMSY = 150%Not applicable
FAO Categories
Exploitation stateNot fully exploited

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.
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 (50 m - 200 m); Slope - Upperslope (200 m - 500 m).   Vertical distribution: Demersal.  

Geographical Distribution
Jurisdictional distribution: National

Water Area Overview
Spatial Scale: National

Geo References
Resource Structure
Considered a single stock: Yes


The Working Group adopted one separate stock of Octopus vulgaris for Guinea -Bissau.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 631tonnes2010
Assessment
 

Assessment year: 2011
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

Information used to assess the Guinea- Bissau Octopus vulgaris stock was the total catch of all fleets (see Table 7.4.3a of FAO, 2015) and the abundance indices used to fit the model were the CPUE series of the Spanish trawlers for the period 2002–2010. Note that the WG does not use the total catch series (1990-2010) because there are many gaps in catch data before 2002. The initial values of the parameters for the Biodyn model are : r = 2.00; K = 20 000 tonnes; BI/K = 80 percent.
Overall Assessment Results

The Working Group considers as satisfactory the results obtained for the model indicating that the stock is notfully exploited. The ratio value of Fcur/FSycur, shows a current effort of 34 percent of the fishing mortality that would give a sustainable yield at current biomass levels. This species has a very fast growth and high mortality, so these results should be treated with caution.
Scientific Advice

The fishing effort should not exceed the level for the period 2007-2009. Catch should not overcome the average of 3 000 tonnes. Data provided in 2010 are provisional and are not considered for this recommendation. The WG recommends to review the statistics series of all fleets that harvest this resource.
Management
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 openhttp://www.fao.org/3/a-i5301b.pdf
FAO. 2015. Report of the FAO/CECAF Working Group on the Assessment of Demersal Resources – Subgroup South. Accra, Ghana, 15–24 November 2011 / Rapport du Groupe de travail FAO/COPACE sur l’évaluation des ressources démersales – Sous-groupe Sud. Accra, Ghana, 15-24 novembre 2011. CECAF/ECAF Series/COPACE/PACE Séries. No. 15/76. Rome, Italy/Italie.  Click to openhttp://www.fao.org/3/a-i5138b.pdf
Bibliography
 
All references to figures, tables and bibliography in the text are found within the source of information.
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