Fisheries and Resources Monitoring System

EspañolFrançais
Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia
Marine Resource  Fact Sheet
CECAF Scientific advice 2016
Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia
Fact Sheet Citation  
Sardinelles (Sardinella maderensis, Sardinella aurita) - stock nord (Guinée-Bissau, Guinée, Sierra Leone et Libéria )
Owned byFood and Agriculture Organization (FAO) – More
Related observationsLocate in inventorydisplay tree map
 
Species:
Geographic extent of Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia
Main Descriptors
Considered a single stock: Yes        Spatial Scale: Regional
Management unit: Yes        Reference year: 2012
 
 
Biological State and Trend
State & Trend Descriptors
PartnerFIRMS
Exploitation rateFcur/F0.1 = 48%; Fcur/FMSY = 44%Not applicable
Abundance levelBcur/B0.1 = 157% ; Bcur/Bmsy = 172%Not applicable
Aq Res State Trend
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.   Depth zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m); Slope (200 m - 1000 m).   Vertical distribution: Pelagic.  

Geographical Distribution
Jurisdictional distribution: Shared between nations

Water Area Overview
Spatial Scale: Regional

Geo References
Resource Structure
Considered a single stock: Yes


Sardinellas caught in the southern CECAF area from Guinea to Angola are composed of two species, round sardinella (Sardinella aurita) and flat sardinella (Sardinella maderensis), however they are commonly not distinguished in catch reporting. The surveys carried out in the CECAF area show that sardinella is found in a vast area stretching from the North to South of all area. For the moment, the FAO/CECAF Working Group has agreed on the existence of four stocks for these two species in the southern CECAF area: northern zone (Guinea-Bissau, Guinea, Sierra Leone and Liberia), western zone (Côte d’Ivoire, Togo, Ghana, Togo and Benin), central zone (Nigeria and Cameroon) and southern zone (Gabon, the Democratic Republic of the Congo, the Congo and Angola) areas (Figure 2.1.1) (FAO, 2015).
Exploitation
 
Fishery Indicators
TypeMeasureValueUnitTime period
ProductionCatch 34726tonnes1990
Catch 32274tonnes1991
Catch 10991tonnes1992
Catch 4651tonnes1993
Catch 526tonnes1994
Catch 8011tonnes1995
Catch 5927tonnes1996
Catch 9319tonnes1997
Catch 4790tonnes1998
Catch 5600tonnes1999
Catch 13375tonnes2000
Catch 9651tonnes2001
Catch 24109tonnes2002
Catch 26033tonnes2003
Catch 26645tonnes2004
Catch 39744tonnes2005
Catch 21362tonnes2006
Catch 19106tonnes2007
Catch 26192tonnes2008
Catch 26664tonnes2009
Catch 29702tonnes2010
Catch 43329tonnes2011
Catch 35510tonnes2012
Assessment
 

Assessment year: 2014
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

Catch data are not reported separately for this species by countries in the region except for Guinea. The input data were total catch data of Sardinella spp. from the artisanal and industrial fisheries of Guinea and Liberia, and from the industrial fisheries of Guinea-Bissau for the period 2000–2012. The artisanal fisheries data from Guinea-Bissau were not available to the Working Group, and artisanal caches for the recent period for Liberia were not available either. The catch data for Sierra Leone for 2009 to 2012 were also not available to the Working Group, and thus for assessment purposes, the Working Group decided to estimate rolling averages for the recent series (2009–2012) based on the average of the total artisanal catch (2006–08). The CPUE of Guinea-Bissau’s industrial fishery was used in the assessment. The input parameters for the assessment were: r = 0.45, K = 100000 tonnes, and BI/K = 60 percent.
Overall Assessment Results

The model fitted reasonably well to the data. A summary of the results of the assessments is presented in Table 2.6.1a [see also "Biological state and trend"] and in Figure 2.6.1a (FAO, 2015). The results from the assessment indicate that the current biomass of Sardinella spp. is 57 percent above B0.1. The relationship between the current fishing mortality at F0.1 is 48 percent, and is lower than the fishing mortality coefficient that will provide a sustainable yield in the long term. The results of the model showed that the stock is not fully exploited. Although the model shows that the stock is not fully exploited, other knowledge available on these fisheries from the region indicate that Sardinella spp. is probably fully exploited.
Scientific Advice

As a precautionary measure, do not exceed current fishing level. As the current catch information is uncertain, the Working Group did not make a specific catch recommendation.
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 Small Pelagic Fish – Subgroup South. Pointe Noire, Congo, 17–23 March 2014. Rapport du Groupe de travail FAO/COPACE sur l’évaluation des petits poissons pélagiques – Sous-groupe Sud. Pointe Noire, Congo, 17-23 mars 2014. CECAF/ECAF Series / COPACE/PACE Séries No. 15/75 Rome, FAO. 157 pp.  Click to openhttp://www.fao.org/3/a-i5040b.pdf
Bibliography
 
All references to figures, tables and bibliography in the text are found within the source of information.
powered by FIGIS  © FAO, 2017
Powered by FIGIS
crawl