Mercury content of sarotherodon melanotheron and chrysischthys nigrodigitatus of Lake Nokoue and Porto Novo lagoon in Benin

Degila, Hermione W.; Azon, N. B. Nadia; Adounkpè, Julien; Chikou, Antoine; Aïna, Martin Pépin

doi:10.4314/ijbcs.v14i6.31

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…Total mercury content was determined in both water and sediment samples using a direct mercury analyzer (DMA-80). The method has been extensively described elsewhere [ 1 , 7 , 8 ]. In short, this mercury analyzer has the particularity to directly assay the metal without any chemical pretreatment.…”

Section: Methodsmentioning

confidence: 99%

Assessment of the Temporal and Spatial Variation of the Mercury Content of Lake Nokoué in Southern Benin Republic (West Africa)

Adounkpè

Azon

Degila

et al. 2021

The Scientific World Journal

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Anthropogenic input of mercury into watersheds is becoming increasingly noticeable and is the cause of fishery products contamination. This had led to the Convention of Minamata signed and ratified by the vast majority of the countries in the world. Lake Nokoué in Benin Republic, the most fishery products provider in West Africa, is subject to mercury pollution. The health threat to both the benthic and the consumers of the fishery products from this lake has to be anticipated by precisely determining the dynamics of mercury contamination of the waters and sediments of Lake Nokoué, taking into account the anthropogenic contribution. Water and sediment samples were collected on 23 sites twice a month for four sampling campaigns. Parameters such as pH, salinity, COD, and SS are evaluated in the water. The assessment of total mercury is conducted by cold vapor atomic absorption according to the US EPA 7473 method, using a direct mercury analyzer (DMA-80). On average, the mercury content in Lake Nokoué water is 0.43 ± 0.57 μg/kg. Its variation is linked not only to the seasonal variation but also to that of the suspended matter. South of the lake, the sediments are extremely polluted (5 ≤ Igeo) and present a risk of frequent effects for the benthic species present.

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Section: Methodsmentioning

confidence: 99%

Assessment of the Temporal and Spatial Variation of the Mercury Content of Lake Nokoué in Southern Benin Republic (West Africa)

Adounkpè

Azon

Degila

et al. 2021

The Scientific World Journal

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“…Therefore, Burkina Faso's freshwater systems are not threatened by gold mining activities. Degila et al (2020) measured mercury on samples of two species of fish in Benin, Sarotherodon melanotheron and Chrysischthys nigrodigitatus from Lake Nokoué and the lagoon of Porto Novo. C. nigrodigitatus fish had the highest rate of mercury accumulation, which is thought to be due to their difference in diet.…”

Section: Mercury In the Atmosphere And In Aquatic Ecosystemsmentioning

confidence: 99%

Mercury pollution in Africa: A review

Abdoul¹,

Alassane²,

Alphonse³

et al. 2022

J. Environ. Chem. Ecotoxicol.

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Since the Minamata conference, the scientific and professional worlds (gold industry, metal extraction, health) have come together to conduct research and raise awareness of the effects of mercury (Hg) in the environment, particularly on public health. Africa has not remained on the sidelines of these events, which have a planetary scope due to the long-range transport of various anthropogenic and natural sources of mercury. Since then, scientific data has been produced both in Africa and other continents in the world on the knowledge of the properties of mercury (Hg) as a poison that can migrate through all the links in the food chain. This scientific article is an analysis of mercury (Hg), its sources, its distribution, its health and environmental impacts (terrestrial, aquatic, atmospheric ecosystems, etc.) in Africa. It also aims to present the recent development in this field in the form of a general analysis and to present the measures taken at the political level to control mercury flows in developing countries while highlighting the shortcomings of these policies at the national level in some African countries.

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“…On the Beninese coast, the Lake Nokoué-Porto-Novo lagoon complex is the largest water body in the country [10,11]. It provides more than 600,000 people livelihoods through various ecosystem services such as fisheries, floodplain agriculture, and increasing sand extraction activities [12,13].…”

Section: Introductionmentioning

confidence: 99%

Drivers of Small-Scale Fishers’ Willingness to Adopt Property Rights Co-Management in the Lake Nokoué and Porto-Novo Lagoon Complex in Southeast Benin

Kpanou

Chogou²,

Hounnou³

et al. 2022

Fishes

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The estuarian and lagoon areas of southeast Benin are atypical lake territories where private property rights are hereditary from endogenous legal tradition. People live in stilt dwellings and are exclusively dedicated to free-to-access fishing. Consequently, an increasing number of fishers with low respect for the State’s general rules for sustainable fishing contribute to legal pluralism and the tragedy of the commons. Co-management of small-scale fisheries has been advocated to offer various benefits, including improved socio-ecological integration, shared sustainable livelihoods, and adherence to biodiversity objectives. This study aims to assess the factors that influence the willingness of small-scale fishers to adopt property rights co-management options in southeast Benin. The data were collected using the discrete choice experiment method. The results show that 44% of fishers are willing to adopt property rights co-management options. This willingness is determined by their involvement in the co-management committee, access to a subsidy and livelihood diversification options. These fishers are the oldest in the sample and primarily owners of Acadja, a traditional fishing tool made of bush and tree branches planted in the lake. Institutional agreements for co-management establishment, such as subsidies to support small-scale fishers’ livelihood diversification and capacity-building, must be set up to achieve co-management goals.

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Mercury content of sarotherodon melanotheron and chrysischthys nigrodigitatus of Lake Nokoue and Porto Novo lagoon in Benin

Cited by 4 publications

References 7 publications

Assessment of the Temporal and Spatial Variation of the Mercury Content of Lake Nokoué in Southern Benin Republic (West Africa)

Assessment of the Temporal and Spatial Variation of the Mercury Content of Lake Nokoué in Southern Benin Republic (West Africa)

Mercury pollution in Africa: A review

Drivers of Small-Scale Fishers’ Willingness to Adopt Property Rights Co-Management in the Lake Nokoué and Porto-Novo Lagoon Complex in Southeast Benin

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