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Southern pink shrimp - Ghana
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Southern pink shrimp - Ghana
Fact Sheet Citation  
Crevette rose du sud (Penaeus notialis) - Ghana
Owned byFood and Agriculture Organization (FAO) – More
Monitoring periodPreviously monitored as: Southern pink shrimp - Cote d'Ivoire, Ghana, Togo and Benin
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Related observationsLocate in inventorydisplay tree map
 
Species:
FAO Names: en - Southern pink shrimp, fr - Crevette rose du Sud, es - Camarón rosado sureño

Fishery Indicators
Production: Catch
Geographic extent of Southern pink shrimp - Ghana
Main Descriptors
Considered a single stock: Yes        Spatial Scale: National
Management unit: Yes        Reference year: 2008
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 48%; Fcur/FMSY = 43%Not applicable
Abundance levelBcur/B0.1 = 126% ; Bcur/BMSY = 139%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.   Bottom type: Soft bottom muddy or muddy-sand.   Depth zone: Coastal (0 m - 50 m).   Horizontal distribution: Estuarine; Littoral.   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 Penaeus notialis for each country.
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 316tonnes1990
Catch 217tonnes1991
Catch 170tonnes1992
Catch 165tonnes1993
Catch 360tonnes1994
Catch 427tonnes1995
Catch 448tonnes1996
Catch 287tonnes1997
Catch 308tonnes1998
Catch 314tonnes1999
Catch 318tonnes2000
Catch 302tonnes2001
Catch 313tonnes2002
Catch 219tonnes2003
Catch 113tonnes2004
Catch 141tonnes2005
Catch 256tonnes2006
Catch 239tonnes2007
Catch 254tonnes2008
Catch 271tonnes2009
Catch 138tonnes2010
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

Total catches from shrimpers and coastal trawler fleets operating from 1990 to 2008 were used by the Working Group for the assessment. The CPUE series from the shrimp trawler fleet was taken as the index of abundance as it was considered that this series best reflects the trends in abundance of the stock. The initial values for the parameters of the Biodyn model are: r=1.2; K=1000tonnes and BI/K = 40 percent.
Overall Assessment Results

The results of the assessment concluded that the Ghanaian stock of P. notialis is not fully exploited. The current fishing effort was 43 percent of the fishing effort that produces the biomass MSY (FMSY) and 48 percent of the effort that produces the target biomass (F0.1), which indicates the stock is not fully exploited. Catches are close to what the stock can produce at a sustainable level. The situation of this stock is similar to the last assessment, even though the current biomass is very low.
Scientific Advice

As a precautionary approach the catch should not exceed the level established in the last assessment in 2008 of 170 tonnes from an average of the period 2004–2006.
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
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