Fisheries and Resources Monitoring System

Coastal shrimps - Nigeria and Cameroon
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Coastal shrimps - Nigeria and Cameroon
Fact Sheet Citation  
Crevettes côtières - Nigéria et Cameroun
Owned byFood and Agriculture Organization (FAO) – More
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Geographic extent of Coastal shrimps - Nigeria and Cameroon
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
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).   Horizontal distribution: Estuarine; Littoral.   Vertical distribution: Demersal.  

Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Regional

Geo References
Resource Structure
Considered a single stock: Yes

In these groups we include other fleets targeting Penaeus notialis, which were not considered in Section 6.3, because the catch data available comprise a sum of species captured in the same zones and with the same fishing gears, but the catches have not been separated into species. The main species are Parapenaeopsis atlantica, Penaeus notialis and P. monodon combined. The Penaeus notialis is the most important species.
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 8697tonnes1990
Catch 8144tonnes1991
Catch 12436tonnes1992
Catch 14217tonnes1993
Catch 10922tonnes1994
Catch 14956tonnes1995
Catch 12566tonnes1996
Catch 15150tonnes1997
Catch 20397tonnes1998
Catch 11326tonnes1999
Catch 11538tonnes2000
Catch 15295tonnes2001
Catch 13751tonnes2002
Catch 13731tonnes2003
Catch 11711tonnes2004
Catch 12678tonnes2005
Catch 12181tonnes2006
Catch 11319tonnes2007
Catch 11688tonnes2008
Catch 9718tonnes2009
Catch 8107tonnes2010

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 shrimpers off Nigeria (1990–2010) were used by the Working Group. The abundance indices used were the CPUEs of this same fleet. Note that effort data was in number of vessels. An estimate was made from the CPUE in kg/vessel to kg/fishing day, based on the average of fishing days by vessel per year, which has been calculated as 270 days. The Working Group intended to make a joint assessment of coastal shrimps in Nigeria and Cameroon, as a single stock, however this was not possible since the countries use different units for the effort data. Furthermore, Cameroon has large changes in effort (increase) and catch (decrease) series data between 1990 and 2007, leading to a general decrease in the CPUE series which is not compatible with the situation observed for Nigeria.
Overall Assessment Results

The Working Group rejects the results of the model.
Scientific Advice

The Working Group was not in a position to provide specific management advice for these stocks. However decided to adopt a precautionary approach while waiting to obtain more information. It recommends that no new shrimp licences should be issued for fishing these stocks.
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
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