Madeiran sardinella and Round sardinella - Gabon, Congo, Democratic Republic of the Congo and Angola|
| Fact Sheet Title Fact Sheet |
| | | Madeiran sardinella and Round sardinella - Gabon, Congo, Democratic Republic of the Congo and Angola |
 | Sardinelles (Sardinella maderensis, Sardinella aurita) - stock sud (Gabon, Congo, République démocratique du Congo et Angola) |
| | 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 | Species Ref: en - Madeiran sardinella, fr - Grande allache, es - Machuelo |
Fishery IndicatorsProduction: Catch |
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| ident Block Madeiran sardinella and Round sardinella - Gabon, Congo, Democratic Republic of the Congo and Angola
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| fao Div |
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| 34.3.5 | Central Gulf of Guinea |
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| 34.3.6 | Southern Gulf of Guinea |
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| 47.1.1 | Cape Palmeirinhas |
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| 47.1.2 | Cape Salinas |
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| 47.1.3 | Cunene |
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| | Aq Res | Biological Stock: No
Value: Regional
Management unit: No
Reference year: 2016
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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 Madeiran sardinella and Round sardinella - Gabon, Congo, Democratic Republic of the Congo and Angola
| fao Div | 34.3.5: Central Gulf of Guinea | | 34.3.6: Southern Gulf of Guinea | | 47.1.1: Cape Palmeirinhas | | 47.1.2: Cape Salinas | | 47.1.3: Cunene |
| | | | | | Water Area Overview
| Exclusive Economic Zone Areas (EEZ) | GAB: Gabon | | COG: Congo, Republic of | | COD: Congo, Dem. Rep. of the | | AGO: Angola |
| | | | | | Water Area Overview |
Water Area OverviewMadeiran sardinella and Round sardinella - Gabon, Congo, Democratic Republic of the Congo and Angola Aq Res Struct Biological Stock: No 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: -SOUTHERN STOCK- The catch data series for Sardinella spp was updated by all countries. However only Congo updated data series for aurita and maderensis. Catches in the region generally decreased from 1990 to 2007 but there is a general increasing trend from 2007 to 2017. The artisanal effort for Congo is the largest in the region and is presented in Table 2.2.2 and Figure 2.2.2a and Figure 2.2.2b. Fishing effort for the artisanal fleet in Congo reduced from 2008 to 2015, however there has been a slight increase in effort since 2016. The main fishery for sardinella in the southern stock is the artisanal fishery. 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). -SOUTHERN STOCK- The CPUE for Sardinella spp. in Gabon’s artisanal fisheries is very low and shows fluctuating trends with general increasing trends (Figure 2.3.1e, Figure 2.3.1f, and Table 2.3.1c). CPUE for 2015 was the highest in the series for Congo artisanal, but for 2016 and 2017 the CPUE decreased. Congo industrial fisheries has the highest CPUE in the region which showed a general increasing trend from 2000 to 2017. There was no CPUE estimate for Angola as effort data were unrealistic; thus, they were not used. **Angola did not provide data for 2017. Democratic Republic of Congo Artisanal encircling gillnet small pelagic fisheryDemocratic Republic of Congo Artisanal beach seine fisheryCongo Purse seiners sardinella fishery - Pointe Noire and Conkouati zonesCongo Artisanal encircling gillnet sardinella fishery - Pointe Noire and Conkouati zonesCongo Artisanal pure seine sardinella fishery - Pointe Noire and Conkouati zonesCongo Artisanal beach seine fishery - Pointe Noire zoneCongo Artisanal small mesh size net small pelagic fishery - Pointe Noire zoneCongo Artisanal cast net bonga shad and mullet fishery - Pointe Noire zoneGabon Industrial sardinella and mackerel fishery - within EEZ off 3 nmGabon Estuaries artisanal sardinella and mackerel fishery - Estuary between Cocobeach and Libreville Fishery Indicators | Type | Measure | Value | Unit | Time period |
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| Production | Catch | 99581 | tonnes | 1990 | | Catch | 99313 | tonnes | 1991 | | Catch | 43209 | tonnes | 1992 | | Catch | 47705 | tonnes | 1993 | | Catch | 72863 | tonnes | 1994 | | Catch | 64484 | tonnes | 1995 | | Catch | 63539 | tonnes | 1996 | | Catch | 4882 | tonnes | 1997 | | Catch | 20703 | tonnes | 1998 | | Catch | 26629 | tonnes | 1999 | | Catch | 14639 | tonnes | 2000 | | Catch | 12611 | tonnes | 2001 | | Catch | 17254 | tonnes | 2002 | | Catch | 31206 | tonnes | 2003 | | Catch | 12597 | tonnes | 2004 | | Catch | 17227 | tonnes | 2005 | | Catch | 19663 | tonnes | 2006 | | Catch | 19151 | tonnes | 2007 | | Catch | 78089 | tonnes | 2008 | | Catch | 87652 | tonnes | 2009 | | Catch | 67944 | tonnes | 2010 | | Catch | 52043 | tonnes | 2011 | | Catch | 116214 | tonnes | 2012 | | Catch | 78479 | tonnes | 2013 | | Catch | 139192 | tonnes | 2014 | | Catch | 161608 | tonnes | 2015 | | Catch | 215174 | tonnes | 2016 |
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 for Sardinella spp. from the artisanal and industrial fisheries of all countries. The CPUE used in the assessment was the abundance index of acoustic surveys estimated by RV Dr. Fridtjof Nansen in Angola (Winter surveys, 1990–2017). The initial parameters for the assessment were: Sardinella spp.: r = 0.5/year, K = 500 000 tonnes and BI/K = 80 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: A summary of the results of the assessments is presented in Table 2.6.1c and Figure 2.6.1d. The results of the assessment show that the current biomass is 13 percent above B0.1. The current fishing mortality is 55 percent above F0.1.. The results show that Sardinella spp. is fully exploited. DISCUSSION: The model shows that Sardinella spp. in the south is fully exploited. As the current fishing mortality is more than that which can be maintained at the current biomass level, the biomass is expected to decrease in future years if the current fishing mortality is maintained. Sci Advice As a precautionary approach, it is recommended not to exceed catch level of the average of the last 5 years (121 862)(FAO, 2020). **Angola did not provide data for 2017. 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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