Fisheries and Resources Monitoring System

Cuttlefishes - Guinea-Bissau
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Cuttlefishes - Guinea-Bissau
Fact Sheet Citation  
Seiche (Sepia spp) - Guinée-Bissau
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
Geographic extent of Cuttlefishes - 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
FAO Categories
Exploitation stateUncertain/Not assessed
Habitat and Biology
Climatic zone: Tropical.   Depth zone: Coastal (0 m - 50 m); Shelf - Uppershelf (up to 100 m).   Vertical distribution: Demersal.  

Geographical Distribution
Jurisdictional distribution: National

Water Area Overview
Spatial Scale: National

Geo References
Resource Structure
Considered a single stock: Yes
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 6487tonnes1990
Catch 8176tonnes1991
Catch 3985tonnes1992
Catch 5012tonnes1993
Catch 5393tonnes1994
Catch 6120tonnes1995
Catch 3801tonnes1996
Catch 3751tonnes1997
Catch 16tonnes1998
Catch -tonnes1999
Catch 2921tonnes2000
Catch 2835tonnes2001
Catch 3725tonnes2002
Catch 4408tonnes2003
Catch 2748tonnes2004
Catch 2318tonnes2005
Catch 779tonnes2006
Catch 1982tonnes2007
Catch 2262tonnes2008
Catch 1467tonnes2009
Catch 201tonnes2010

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

Total catches from all fleets operating from 1990 to 2010 were used by the Working Group for the assessment. The CPUE series from the Spanish fleet was taken as the index of abundance as it was considered that this series best reflects the trends in abundance of the stock. Missing CPUE values for 1999 were estimated from the period 1996-1998 assuming the exploitation pattern was the same in the period considered for the assessment. The initial parameter values for the Biodyn model are: r = 1.00; K = 16 000 tonnes; BI/K = 60 percent.
Overall Assessment Results

The model did not fit well with the estimates and observed CPUE data for the Sepia spp. stock, and no diagnosis can then be made from the results of the model that shows inconsistencies. Finally, the lack of information from the important fleets (Chinese and others) in 2009 and 2010 could influence the results, so the Working Group rejected this assessment. 
Scientific Advice

As a precautionary measure, the catch should not exceed the level of the average 2007-2009 period (1 900 tonnes)
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 open
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 open
powered by FIGIS  © FAO, 2021
Powered by FIGIS