Fisheries and Resources Monitoring System

Deep-water rose shrimp - Guinea-Bissau
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Deep-water rose shrimp - Guinea-Bissau
Fact Sheet Citation  
Crevette rose du large (Parapenaeus longirostris) - Guinée-Bissau
Owned byFood and Agriculture Organization (FAO) – More
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FAO Names: en - Deep-water rose shrimp, fr - Crevette rose du large, es - Gamba de altura, ar - إيربيان وردية أعماق المياه, zh - 长额拟对虾, ru - Креветка розовая глубоководная

Fishery Indicators
Production: Catch
Geographic extent of Deep-water rose shrimp - 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
Exploitation rateFcur/F0.1 = 63%; Fcur/FMSY = 57%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/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: Shelf - Edgeshelf; Slope (200 m - 1000 m).   Horizontal distribution: Neritic; Oceanic.   Vertical distribution: Demersal/Benthic.  

Geographical Distribution
Jurisdictional distribution: National

Water Area Overview
Spatial Scale: National

Geo References
Resource Structure
Considered a single stock: Yes

The Working Group considers a single stock for this species in Guinea Bissau and Guinea, but given that no new data is available from Guinea since 2007 this precludes a joint assessment and hence only Guinea-Bissau stock was considered in the assessment. 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 1768tonnes1990
Catch 992tonnes1991
Catch 1145tonnes1992
Catch 921tonnes1993
Catch 1105tonnes1994
Catch 1073tonnes1995
Catch 1472tonnes1996
Catch 1297tonnes1997
Catch 39tonnes1998
Catch 473tonnes1999
Catch 1144tonnes2000
Catch 1539tonnes2001
Catch 1157tonnes2002
Catch 1548tonnes2003
Catch 1560tonnes2004
Catch 1522tonnes2005
Catch 841tonnes2006
Catch 1221tonnes2007
Catch 1973tonnes2008
Catch 2359tonnes2009
Catch 1689tonnes2010

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

For the catch series, data from the shrimpers and Spanish shrimpers’ fleet operating off Guinea-Bissau were used, for the period between 1990 and 2010. The Working Group decided to use the CPUE series of the Spanish shrimpers’ fleet as abundance index. The initial values for the model are: r = 2.00, K = 6 000 tonnes and BI/K = 40 percent.
Overall Assessment Results

The fit of the model to the data is good. The current fishing effort is below the levels that the effort can produce the target biomass (F0.1) while the current biomass is higher (26 percent) than the target biomass B0.1 (Table and Figure 6.4.4a of FAO, 2015) [see also "Biological state and trend"].
Scientific Advice

Not to increase the fishing effort.The total catch should not exceed the mean of the last three years (2008-2010) of 2000 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
All references to figures, tables and bibliography in the text are found within the source of information.
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