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| Fact Sheet Title Fact Sheet |
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| Bonga shad - Mauritania, Senegal and Gambia |
 | Ethmalose (Ethmalosa fimbriata) - Mauritanie, Sénégal et Gambie |
| | 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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| ident Block | ident Block | | | | Species List: | | Species Ref: en - Bonga shad, fr - Ethmalose d'Afrique, es - Sábalo africano, ru - Бонга |
Fishery IndicatorsProduction: Catch |
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| ident Block Bonga shad - Mauritania, Senegal and Gambia
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| fao Sub Div |
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| 34.1.32 | Atlantic, East central / 34.1.32 |
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| 34.3.11 | Atlantic, East central / 34.3.11 |
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| 34.3.12 | Atlantic, East central / 34.3.12 |
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| Aq Res | Biological Stock: Yes
Value: Regional
Management unit: Yes
Reference year: 2014
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| 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. |
| | | | | | Aq Res State Trend Fcur/F0.1: Ratio between the observed fishing mortality coefficient during the last year of the series and F0.1. Unless otherwise indicated, the indicators were based on the Schaefer dynamic production stock assessment model. Habitat Bio Climatic Zone: Tropical. Depth Zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m). Horizontal Dist: Neritic. Vertical Dist: Pelagic. Geo Dist Geo Dist: Shared between nations Water Area Overview  | | Water Area Overview Bonga shad - Mauritania, Senegal and Gambia
| fao Sub Div | 34.1.32: Atlantic, East central / 34.1.32 | | 34.3.11: Atlantic, East central / 34.3.11 | | 34.3.12: Atlantic, East central / 34.3.12 |
| | | | | | Water Area Overview
| Exclusive Economic Zone Areas (EEZ) | MRT: Mauritania | | SEN: Senegal | | GMB: Gambia |
| | | | | | Water Area Overview |
Water Area OverviewBonga shad - Mauritania, Senegal and Gambia Aq Res Struct Biological Stock: Yes The assumption that the West African bonga shad stock is a single stock was maintained by the Working Group. A detailed description of the stock is given in the 2007 report of the FAO Working Group. According to the synoptic presentation of biological data on the bonga shad by E. Charles Dominique (1982), the bonga shad (Ethmalosa fimbriata) is mainly concentrated in Mauritania, Senegal and The Gambia. Exploit Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 22824 | tonnes | 1990 | | Catch | 29188 | tonnes | 1991 | | Catch | 24183 | tonnes | 1992 | | Catch | 31385 | tonnes | 1993 | | Catch | 30451 | tonnes | 1994 | | Catch | 29635 | tonnes | 1995 | | Catch | 40159 | tonnes | 1996 | | Catch | 38066 | tonnes | 1997 | | Catch | 35970 | tonnes | 1998 | | Catch | 36816 | tonnes | 1999 | | Catch | 39761 | tonnes | 2000 | | Catch | 49365 | tonnes | 2001 | | Catch | 43428 | tonnes | 2002 | | Catch | 43511 | tonnes | 2003 | | Catch | 27524 | tonnes | 2004 | | Catch | 33157 | tonnes | 2005 | | Catch | 23407 | tonnes | 2006 | | Catch | 25383 | tonnes | 2007 | | Catch | 23716 | tonnes | 2008 | | Catch | 51763 | tonnes | 2009 | | Catch | 61617 | tonnes | 2010 | | Catch | 43131 | tonnes | 2011 | | Catch | 62359 | tonnes | 2012 | | Catch | 114941 | tonnes | 2013 | | Catch | 83397 | tonnes | 2014 |
Bio Assess Assessment year: 2015 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”. Assess Models Type: Size-structured Length Cohort Analysis (LCA) A length frequency average based on the total catch in the areas concerned was used. The lengths of the individuals of the final matrix derived are between 5 and 43 cm. The length frequencies in The Gambia for 2014 were not available to the Working Group, so the length frequencies from the southern part of Senegal was used to raise to the total catch of The Gambia. The growth and mortality parameters used (Table 7.6.1 of FAO, 2016b) in the two models were estimated by the Working Group based on the analysis of the modal progression using the FISAT II - Version 1.2.2 software (FAO-ICLARM Stock Assessment Tools) (Gayanilo, Sparre and Pauly, 2005). The parameters of the length-weight ratio used are derived from the FishBase data base. Yield per Recruit Analysis (Y/R) The results of the LCA were then used as input data for the yield-per-recruit model. Results The results of the two methods showed that the fishing pressure on the bonga stock is very high and that the stock in sub-region is still overexploited. However, the results obtained from the analyses should be treated with caution in view of the uncertainties about selectivity and the lack of information for formulating assumptions on the identity of the bonga stock in the sub-region and its geographic distribution as well as the lack of biological data on the different fisheries. Sci Advice The Working Group notes a general increasing trend in catches even though a decrease was observed in 2014. The Working Group recommends that effort should be decreased as compared to current levels for bonga to regain a catch level that can ensure sustainability. Management Management unit: Yes Sources FAO. 2016a. 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/I5301Bi/i5301bi.pdfFAO. 2016b. Report of the FAO Working Group on the Assessment of Small Pelagic Fish off Northwest Africa. Casablanca, Morocco, 20–25 July 2015 / Rapport du Groupe de travail de la FAO sur l’évaluation des petits pélagiques au large de l’Afrique nord-occidentale. Casablanca, Maroc, 20-25 juillet 2015. FAO Fisheries and Aquaculture Report/FAO Rapport sur les pêches et l’aquaculture No. 1122. Rome, Italy/Italie. http://www.fao.org/3/a-i5511bb.pdf Bibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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