Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia|
| Marine Resource Fact Sheet |
| | | Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia |
 | Sardinelles (Sardinella maderensis, Sardinella aurita) - stock nord (Guinée-Bissau, Guinée, Sierra Leone et Libéria ) |
| | Data Ownership | | This document provided, maintained and owned by Food and Agriculture Organization (FAO) , is part of CECAF Stock Status Reports data collection. |
| | Related observations | Locate in inventory | | | | Species: | | FAO Names: en - Round sardinella, fr - Allache, es - Alacha, ru - Сардинелла круглая (=алаша) |
Fishery IndicatorsProduction: Catch | FAO Names: en - Madeiran sardinella, fr - Grande allache, es - Machuelo |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia Map tips - Click on
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| FAO Fishing Statistical Division Areas |
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| 34.3.3 | Sherbro |
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| FAO Fishing Statistical Subdivision Areas |
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| 34.3.13 | Atlantic, East central / 34.3.13 |
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| | Main Descriptors | Considered a single stock: Yes Spatial Scale: Regional
Management unit: Yes Reference year: 2012
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| Considered a single stock: A group of individuals in a species occupying a well defined spatial range independent of other stocks of the same species. It can be affected by random dispersal movements and directed migrations due to seasonal or reproductive activity. |
| Spatial Scale: Spatial scale contains a standard term such as Global, Regional (e.g. for the whole Atlantic), sub-regional (e.g. for a part of the Atlantic), national, local (for sub-national levels). |
| Considered a management unit: An aquatic resource or fishery is declared as [Fishery] Management Unit if it is effectively the focus for the application of selected management methods and measures, within the broader framework of a management system. According to the FAO Glossary for Responsible Fishing, "a Fishery Management Unit (FMU) is a fishery or a portion of a fishery identified in a Fishery Management Plan (FMP) relevant to the FMP's management objectives." FMU's may be organised around fisheries biological, geographic, economic, technical, social or ecological dimensions , and the makeup and attribute of a fishery management unit depends mainly on the FMP's management objectives. |
| Jurisdictional distribution: Jurisdictional qualifier (e.g. "shared", "shared - highly migratory") of the aquatic resource related with its spatial distribution. |
| Environmental group: Classification of the aquatic resource according to the environmental group (e.g. pelagic invertebrate, or demersal fish) to which the species belong. |
| Reference Year: The Reference Year is the last year considered in the stock assessment and/or fishery status. |
| | | | | | Biological State and Trend 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 Geo References  | | Geographic extent of Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia
| FAO Fishing Statistical Division Areas | 34.3.3: Sherbro | | FAO Fishing Statistical Subdivision Areas | 34.3.13: Atlantic, East central / 34.3.13 |
| | | | | | More Geo References
| Exclusive Economic Zone Areas (EEZ) | GNB: Guinea-Bissau | | GIN: Guinea | | SLE: Sierra Leone | | LBR: Liberia |
| | | | | | Intersecting Major FAO areas and LME areas |
The following area codes have been found as intersecting the distribution of Madeiran sardinella and Round sardinella - Guinea-Bissau, Guinea, Sierra Leone and Liberia 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 | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 34726 | tonnes | 1990 | | Catch | 32274 | tonnes | 1991 | | Catch | 10991 | tonnes | 1992 | | Catch | 4651 | tonnes | 1993 | | Catch | 526 | tonnes | 1994 | | Catch | 8011 | tonnes | 1995 | | Catch | 5927 | tonnes | 1996 | | Catch | 9319 | tonnes | 1997 | | Catch | 4790 | tonnes | 1998 | | Catch | 5600 | tonnes | 1999 | | Catch | 13375 | tonnes | 2000 | | Catch | 9651 | tonnes | 2001 | | Catch | 24109 | tonnes | 2002 | | Catch | 26033 | tonnes | 2003 | | Catch | 26645 | tonnes | 2004 | | Catch | 39744 | tonnes | 2005 | | Catch | 21362 | tonnes | 2006 | | Catch | 19106 | tonnes | 2007 | | Catch | 26192 | tonnes | 2008 | | Catch | 26664 | tonnes | 2009 | | Catch | 29702 | tonnes | 2010 | | Catch | 43329 | tonnes | 2011 | | Catch | 35510 | tonnes | 2012 |
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.  http://www.fao.org/3/a-i5301b.pdfFAO. 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. http://www.fao.org/3/a-i5040b.pdfBibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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