Fish (Arius heudelotii Valenciennes, 1840) as bio-indicator of heavy metals in Douala Estuary of Cameroon

Fonge,

doi:10.5897/ajb11.2351

Cited by 19 publications

(15 citation statements)

References 21 publications

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“…The use of fertilizers, insecticides, herbicides and other chemicals by farmers and agro-establishments may be a threat to the environment especially the soil and water quality. Unfortunately, the legislation on farming practices and or waste disposal in Cameroon are hardly implemented (Fonge et al, 2011;Forton et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Selected physicochemical properties and quality of soils around some rivers of Cameroon

Fomenky¹,

Tening²,

Chuyong³

et al. 2018

J. Soil Sci. Environ. Manage.

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Rivers Wouri and Meme feed the Wouri and Rio del Rey mangroves of Cameroon, respectively. This study examined the physicochemical properties of soils that were collected around the vicinity of these rivers. This was to ascertain the former's role in controlling the movement of chemical entities into these rivers and nutrient quality. Twenty-one surface soil samples were collected (0-20 cm depth) within the vicinity of both rivers and analyzed for their physicochemical properties using standard methods. All the soils were slightly acidic, probably dominated by kaolinitic clay minerals and sesquioxides. The mean ECEC (4.31 cmol/kg) of soils around River Wouri was higher than that (2.94 cmol/kg) of soils around River Meme. The average clay content of 11% in soils around River Meme was more than that (4%) in soils around River Wouri, suggesting that the higher ECEC of soils from Wouri could be contributed by organic matter and soil moisture content. The latter had a significant positive correlation (r = 0.82, p<0.05) with organic matter and clay, respectively, in soils from Wouri. There was also a significant difference (p< 0.01) in Mg (with higher levels in D soils) and in Na (with higher levels in M soils). There was yet other significant differences (p< 0.05) in sand (with higher values in M soils) and in clay (with higher contents in M soils). This again could be an indication that the mineralogical content of the soils could be different. The soils around both rivers have low major nutrients though more depleted around River Wouri and are vulnerable to increases in anthropogenic activities, such as farming practices, industrial and municipal waste disposal. A more stringent legislation about environmental management, as well as studies about the mineralogical composition of soils is recommended.

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Section: Introductionmentioning

confidence: 99%

Selected physicochemical properties and quality of soils around some rivers of Cameroon

Fomenky¹,

Tening²,

Chuyong³

et al. 2018

J. Soil Sci. Environ. Manage.

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“…All heavy metals are potentially harmful to most organisms at some levels of exposure and absorption (Adedeji and Okocha, 2011). The ingestion of heavy metals by fish via food and water may affect not only the productivity and reproductive capabilities of such fish, but ultimately affect the health of man that depends on these organisms as a major source of protein (Fonge et al, 2011). Many ecotoxicological studies in Nigeria have focused on aquatic bodies within or around major cities with little emphasis on aquatic media in rural areas, which may also be impacted by heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal content in fish and water from River Niger at Agenebode, Edo State, Nigeria

Wangboje¹,

Ikhuabe²

2015

Afr. J. Environ. Sci. Technol.

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The concentrations of Lead (Pb), Copper (Cu), Cadmium (Cd) and Zinc (Zn) in fish and water from River Niger at Agenebode, Nigeria were determined by atomic absorption spectrometric technique. The mean concentrations of heavy metals in water ranged from 0.00742 mg/L for Pb to 0.239 mg/L for Zn. The summary statistics for heavy metals in fish showed that the mean concentrations of metals ranged from 0.0291 mg/kg for Pb to 69.14 mg/kg for Zn, while the mean concentrations of metals in individual fish species ranged from below detection/quantification limit (BQL) for Pb in Barbus occidentalis and Chrysichthys nigrodigitatus to 128.87 mg/kg for Zn in Hemichromis fasciatus. The bioaccumulation quotient (BQ) values for metals in fish ranged from BQL for Pb in B. occidentalis and C. nigrodigitatus to 539.21 for Zn in H. fasciatus, while the condition factor for the fish species ranged from 0.32 in Clarias gariepinus to 2.07 in Oreochromis niloticus. The maximum acceptable risk (MAR) values for heavy metals in fish ranged from BQL for Pb in B. occidentalis and C. nigrodigitatus to 6.38 for Cu in H. fasciatus; while the Hazard Quotient (HQ) values for heavy metals in water ranged from 0.05 for Zn to 0.43 for Cd. In fish, the HQ values ranged from BQL for Pb in B. occidentalis and C. nigrodigitatus to 10.74 for Zn in H. fasciatus. The National Environmental Standard and Regulation Enforcement Agency (NESREA) were enjoined to ensure that the environmental safety of our inland water bodies is sustained in order to mitigate negative impacts on human health.

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“…However, very few studies conducted in Cameroon on the effect of trace metals on these marine systems had focused on the Cameroon estuary in the Douala metropolitan area. For instance, the fish Arius heudelotii was identified as bioindicator of trace metal pollution in Douala and the concentration of trace metals in fish and water samples were noted to be higher than safety limits of the World Health Organization (Fonge et al 2011). Also, subsurface soils in the Bassa industrial zone Douala showed enrichments of trace metals (Asaah et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Assessment of trace metal pollution in sediments and intertidal fauna at the coast of Cameroon

Ngeve

Leermakers

Elskens

et al. 2015

Environ Monit Assess

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Coastal systems act as a boundary between land and sea. Therefore, assessing pollutant concentrations at the coast will provide information on the impact that land-based anthropogenic activities have on marine ecosystems. Sediment and fauna samples from 13 stations along the whole coast of Cameroon were analyzed to assess the level of trace metal pollution in sediments and intertidal fauna. Sediments showed enrichment of As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, V, and Zn. However, pollution of greater concern was observed for Cd, Cr, Cu, Ni, and Zn at the northern stations. Some sites recorded trace metal levels higher than recommended in sediment quality guidelines. Species diversity was low, and high bioaccumulation of trace metals was observed in biological samples. Some edible gastropod species accumulated trace metals above the safety limits of the World Health Organization, European Medicine Agency, and the US Environment Protection Agency. Although industrial pollution is significant along Cameroon's coast, natural pollution from the volcano Mount Cameroon is also of concern.

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Fish (Arius heudelotii Valenciennes, 1840) as bio-indicator of heavy metals in Douala Estuary of Cameroon

Cited by 19 publications

References 21 publications

Selected physicochemical properties and quality of soils around some rivers of Cameroon

Selected physicochemical properties and quality of soils around some rivers of Cameroon

Heavy metal content in fish and water from River Niger at Agenebode, Edo State, Nigeria

Assessment of trace metal pollution in sediments and intertidal fauna at the coast of Cameroon

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