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| Marine Resource Fact Sheet |
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| Bonga shad - Guinea-Bissau, Guinea, Sierra Leone and Liberia |
 | Ethmalose (Ethmalosa fimbriata) - 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. |
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| Related observations | Locate in inventory | | | | Species: | | FAO Names: en - Bonga shad, fr - Ethmalose d'Afrique, es - Sábalo africano, ru - Бонга |
Fishery IndicatorsProduction: Catch |
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| Geographic extent of Bonga shad - Guinea-Bissau, Guinea, Sierra Leone and Liberia
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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. 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). Vertical distribution: Pelagic. Geographical Distribution Jurisdictional distribution: Shared between nations Geo References  | | Geographic extent of Bonga shad - 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 Bonga shad - Guinea-Bissau, Guinea, Sierra Leone and Liberia Resource Structure Considered a single stock: Yes Exploitation Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 2 | tonnes | 1990 | | Catch | 70 | tonnes | 1991 | | Catch | 2 | tonnes | 1992 | | Catch | 4 | tonnes | 1993 | | Catch | 0 | tonnes | 1994 | | Catch | 45290 | tonnes | 1995 | | Catch | 47807 | tonnes | 1996 | | Catch | 51344 | tonnes | 1997 | | Catch | 49693 | tonnes | 1998 | | Catch | 39403 | tonnes | 1999 | | Catch | 50667 | tonnes | 2000 | | Catch | 63262 | tonnes | 2001 | | Catch | 68060 | tonnes | 2002 | | Catch | 81448 | tonnes | 2003 | | Catch | 83536 | tonnes | 2004 | | Catch | 64034 | tonnes | 2005 | | Catch | 86004 | tonnes | 2006 | | Catch | 80679 | tonnes | 2007 | | Catch | 114446 | tonnes | 2008 | | Catch | 48348 | tonnes | 2009 | | Catch | 39401 | tonnes | 2010 | | Catch | 46585 | tonnes | 2011 | | Catch | 59657 | 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 The model requires complete time series of data in total catch as well as an index of stock abundance. The estimates of total catch were obtained by adding the catch estimates of all the fleets in each country, and these were used as total catch series. The CPUE from Guinea’s artisanal fishery (1995-2012) was chosen, because for the series made available to the Working Group, it was believed to better reflect the variations of the biomass of the stock. The CPUE for 2005 was not considered in the assessment owing to an error in the estimates. For bonga, the artisanal CPUE was considered more appropriate than the industrial series. After an analysis of the time series, the Working Group decided to proceed with an assessment using the catch data from Guinea only given the lack of catch information from fisheries exploiting the stock from the other countries. For example, there is no information on artisanal catches in Guinea-Bissau and Liberia and no updated information from Sierra Leone for the recent years. The initial parameters used for the assessment model were: - Ethmalosa fimbriata: r =0.7, K = 150 000 tonnes and BI/K = 60 percent. Overall Assessment Results The model fit was considered satisfactory. Scientific Advice As a precautionary measure, do not increase catches from the average of the 5 last years (44 000 tonnes). 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.pdf |
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