Round sardinella - Côte d'Ivoire, Ghana, Togo and Benin|
Fact Sheet Title Fact Sheet |
| | Round sardinella - Côte d'Ivoire, Ghana, Togo and Benin |
Sardinelle ronde (Sardinella aurita) - stock ouest (Côte d'Ivoire, Ghana, Togo et Bénin) |
| Data Ownership | This document provided, maintained and owned by Food and Agriculture Organization (FAO) , is part of CECAF Stock Status Reports data collection. |
| ident Block | ident Block | | Species List: | Species Ref: en - Round sardinella, fr - Allache, es - Alacha, ru - Сардинелла круглая (=алаша) |
Fishery IndicatorsProduction: Catch |
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| ident Block Round sardinella - Côte d'Ivoire, Ghana, Togo and Benin Map tips - Click on to turn layers on and off
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fao Div |
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34.3.4 | Western Gulf of Guinea |
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| Aq Res | Biological Stock: Yes Value: Regional Management unit: No Reference year: 2017
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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. 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 Bio Climatic Zone: Tropical. Depth Zone: Coastal (0 m - 50 m); Shelf (50 m - 200 m); Slope (200 m - 1000 m). Vertical Dist: Pelagic. Geo Dist Geo Dist: Shared between nations Water Area Overview | Water Area Overview Round sardinella - Côte d'Ivoire, Ghana, Togo and Benin
fao Div | 34.3.4: Western Gulf of Guinea |
| | | | Water Area Overview
Exclusive Economic Zone Areas (EEZ) | CIV: Côte d'Ivoire | GHA: Ghana | TGO: Togo | BEN: Benin |
| | | | Water Area Overview |
Water Area OverviewRound sardinella - Côte d'Ivoire, Ghana, Togo and Benin Aq Res Struct Biological 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). Exploit CATCH AND EFFORT: -WESTERN STOCK- Peak catches of the two species occur in June–September, which coincides with the major upwelling period in the area. Fishing effort on sardinella in this region is mainly from the artisanal sector. Ghana has the largest series of effort for sardinella in the region, from 1990 to 2017 for the artisanal fishery. The catch appears to be stable between 1992 and 2000, followed by fluctuations around 80 000 tonnes. In general, catches of the western stock of round sardinella showed a declining trend from 2004 to 2017. CPUE: The CPUE for the artisanal and industrial fisheries was calculated separately for the two sardinella species ( S. auritaand S. maderensis) and stocks. Owing to data collection bottlenecks, the two sardinella species are not reported separately for the northern stock (Guinea-Bissau, Sierra Leone and Liberia); where they are reported as Sardinella spp. Therefore, the CPUE for Sardinella spp. was also calculated. The two species were also combined to harmonize assessment for the south and central stocks (Figure 2.3.1a, Figure 2.3.1b, Figure 2.3.1c, Figure 2.3.1d, Figure 2.3.1e, and Figure 2.3.1f, and Table 2.3.1a, Table 2.3.1b, and Table 2.3.1c). -WESTERN STOCK- All the countries with the exception of Côte d’Ivoire presented data on the artisanal fleet, and the CPUE (Figure 2.3.1a, Figure 2.3.1b, and Table 2.3.1a) indicated fluctuating trends annually for Ghana and Togo, which is typical of small pelagics. The CPUE of Ghana’s industrial fleet indicated a generally decreasing trend from the early 1990s to 1998, followed by a slight increase in 2003. From 2004 to 2017, there was a general decline in CPUEs in the region. *Benin has total catch for Sardinella seperated into S. aurita and S. maderensis using the ratio 60:40 (from survey ratio). Benin Artisanal net small pelagic fishery - coastal zone within 5 nmCôte d`Ivoire Industrial sardine fishery - Shelf areaCôte d`Ivoire Artisanal purse seine fishery - Abidjan, west of AbidjanCôte d`Ivoire Artisanal gillnet pelagic fishery Fishery Indicators Type | Measure | Value | Unit | Time period |
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Production | Catch | 48500 | tonnes | 1990 | Catch | 54070 | tonnes | 1991 | Catch | 127097 | tonnes | 1992 | Catch | 93689 | tonnes | 1993 | Catch | 73639 | tonnes | 1994 | Catch | 69822 | tonnes | 1995 | Catch | 122206 | tonnes | 1996 | Catch | 53426 | tonnes | 1997 | Catch | 57848 | tonnes | 1998 | Catch | 57449 | tonnes | 1999 | Catch | 131969 | tonnes | 2000 | Catch | 99531 | tonnes | 2001 | Catch | 74859 | tonnes | 2002 | Catch | 95173 | tonnes | 2003 | Catch | 100279 | tonnes | 2004 | Catch | 83534 | tonnes | 2005 | Catch | 83979 | tonnes | 2006 | Catch | 52231 | tonnes | 2007 | Catch | 31628 | tonnes | 2008 | Catch | 26298 | tonnes | 2009 | Catch | 46171 | tonnes | 2010 | Catch | 26884 | tonnes | 2011 | Catch | 35539 | tonnes | 2012 | Catch | 30892 | tonnes | 2013 | Catch | 31706 | tonnes | 2014 | Catch | 29748 | tonnes | 2015 | Catch | 52298 | tonnes | 2016 | Catch | 58180 | tonnes | 2017 |
Bio Assess Assessment year: 2018 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”. Data The input data were the total catch data on round sardinella ( S. aurita) and flat sardinella ( S. maderensis) from the artisanal, semi–industrial and industrial fisheries for the period 1990–2017. The CPUE of Ghana’s artisanal fishery was used in the assessment for round sardinella (1990–2017) and Ghana’s artisanal CPUE was used for flat sardinella (1990–2017). The initial input parameters for the assessment of the stock were as follows: Sardinella aurita: r = 0.5/year, K = 500 000 tonnes and BI/K = 60 percent. Assess Models Type: Biomass-aggregated Schaefer dynamic production model The dynamic production model implemented on an Excel spreadsheet was used (FAO, 2013) for all stocks and Cote d’Ivoire tried to assess aurita with LCA and yield per recruit model. Results RESULTS: The model fit was adequate for all the above stocks (Figure 2.6.1b and Figure 2.6.1c). A summary of the results of the assessments is presented in Table 2.6.1b. For round sardinella the current biomass level Bcur of the stock is less than the biomass at B0.1 and the current fishing mortality is more than F0.1 (Fcur/F0.1 = 564 percent). DISCUSSION: The results of the model show that the stock of S. aurita (round sardinella) is overexploited and near collapse in terms of biomass and the fishing mortality levels. This implies that if the fishing effort remains at the current level, the stock may collapse. Sci Advice Current catch of S. aurita is not sustainable. Catch will have to be reduced to avoid future depletion of the stock. The Working Group recommends the fishery should be closed, also considering the R/V Dr Fridtjof Nansen survey results for the region from 2017 (FAO, 2020). Management Management unit: No Sources FAO. 2019. Report of the FAO/CECAF Working Group on the Assessment of Small Pelagic Fish – Subgroup South. Elmina, Ghana, 12-20 September 2018. Rapport du Groupe de travail FAO/COPACE sur l’évaluation des petits poissons pélagiques – Sous-groupe Sud. Elmina, Ghana, 12-20 septembre 2018. CECAF/ECAF Series/COPACE/PACE Séries No. 19/81. Rome. http://www.fao.org/3/ca5402b/ca5402b.pdfFAO. 2019. Fishery Committee for the Eastern Central Atlantic, Report of the eighth session of the Scientific Sub-Committee, Abidjan, Côte d’Ivoire, 23–26 October 2018 / Comité des pêches pour l’Atlantique Centre-Est Rapport de la huitième session du Sous-Comité scientifique, Abidjan, Côte d’Ivoire, 23–26 octobre 2018. FAO Fisheries and Aquaculture Report / FAO Rapport sur les pêches et l’aquaculture No. 1265. Rome. http://www.fao.org/3/ca5623b/ca5623b.pdfFAO. 2020. Report of the Twenty-Second Session of the Fishery Committee for the Eastern Central Atlantic, Libreville, Gabon, 17–19 September 2019. Rapport de la vingt-deuxième session du comité des pêches pour l’Atlantique centre-est, Libreville, Gabon, 17–19 septembre 2019. FAO Fisheries and Aquaculture Report / FAO, Rapport sur les pêches et l’aquaculture No. 1303. Rome. http://www.fao.org/3/ca8000b/CA8000B.pdf Bibliography All references to figures, tables and bibliography in the text are found within the source of information. |
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