Diversity of the edible fishes of the Lagos Lagoon, Nigeria and the public health concerns based on their Lead (Pb) content

Akongyuure, Daniel Nsoh; Ofori-Danson, Patrick K.; Nunoo, F.K.E.

doi:10.5897/ijfa11.067

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…Coastal and estuarine sediments in industrial zones serve as the largest reservoir of metal contaminants in the marine ecosystem [35]. This occurrence is worrisome in view of the use of water bodies like the Lagos Lagoon system and its harbour as source of fish food for the city dwellers [25].…”

Section: Discussionmentioning

confidence: 99%

“…Despite the immutable progress so far made, the challenge of understanding the scale of metal pollution in the Lagos Lagoon system subsists due to among others poor understanding of the pathways of entry of specific metal types and their hotspots in the lagoon and more importantly lack of use of modern analytical equipment capable of allowing for comparison of specific percentages of metal fractions. While an atomic absorption spectrophotometer has been the gold standard of measuring sediment heavy metals in the Lagos Lagoon system [18,20,21,25], only one published study has employed ICP-OES [26]. Amaeze (2012, unpublished) noted considerable metal concentrations in the sediments of this water body as well using ICP-OES analysis only.…”

Section: Discussionmentioning

confidence: 99%

“…This is notable because although the Lagos Lagoon system is famed for its polluted status, the lack of concrete evidence on levels of bioavailable fractions casts a doubt on the potential impacts on polluting activities on the biota. Previous studies in the Lagos Lagoon system have often employed atomic absorption spectrophotometry (AAS) [21,24,25] with the only published study on analysis of sediments using inductively coupled plasma optical emission spectrometry (ICP-OES) being that of [26]. The relevance of this lies in the comparative advantage of the use of multiple instrumentation rather than just in accurately presenting concentrations of the various fractions of heavy metals determined in sediment samples.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Investigation of Total, Recoverable and Bioavailable Fractions of Sediment Metals and Metalloids in the Lagos Harbour and Lagoon System

2019

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This study investigated and characterised concentration of some selected metals and metalloids (As, Cd, Cr, Cu, Co, Fe, Mn, Ni, Pb, Sn, V and Zn) present in surface sediments of the Lagos Harbour (LH) and associated Lagos Lagoon (LG) system using a combination of metal extraction and analytical methods within 26 sampling sites including a control (Apese Lagoon, APL). Sampling was carried out using a Van-veen grab sampler on three occasions (dry seasons 2013, 2014; wet season 2013). The total, recoverable and bioavailable fractions were measured separately by X-ray fluorescence (XRF), Aqua regia (AR) extraction with inductively coupled plasma optical emission spectrometry (ICP-OES) and 1 M hydrochloric acid (1 M HCl) extraction with inductively coupled plasma mass spectrometry (ICP-MS) analysis, respectively. Results were compared with National Oceanic and Atmospheric Administration (NOAA)/Canadian Sediment Quality Guidelines (CSQG) and geochemical spatial distribution maps. Threshold effect level (TEL) were exceeded by total concentration of Cu, Zn and recoverable As across the lagoons. Bioavailable As was below TEL while Ni was associated with the ports in the LH.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative Investigation of Total, Recoverable and Bioavailable Fractions of Sediment Metals and Metalloids in the Lagos Harbour and Lagoon System

2019

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“…Sediment quality values are useful to screen the potential for contaminants within sediment to induce biological effects and compare sediment contaminant concentration with the quality guideline (Speneer & Macleod 2002). In the last decade, several researchers (Abrahim & Parker 2008;Nobi et al 2010;Ghrefat et al 2011;Ladigbolu & Balogun 2011;Ajagbe et al 2012;Ekaete et al 2015) reported moderate to high concentrations of heavy metal contaminants in river sediments. Caeiro et al (2005) also observed that different assessment indices for the aquatic environment have been developed and these are powerful tools for development, evaluation and conveying raw environmental information to decision makers, managers and water stakeholders.…”

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confidence: 99%

Multivariate analysis of sediment quality in River Ogbere, Ibadan, South-West Nigeria

et al. 2021

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Heavy metals are pollutants of river sediments, and their concentration varies depending on parental material and anthropogenic inputs, thus important to distinguish between the natural and anthropogenic inputs. The objective of this study is to use different types of indexes to assess the current pollution status in Ogbere River sediment and select the best index to describe the sediment quality. The indexes used in this study were enrichment factor (EF), geoaccumulation index (Igeo) and principal component analysis (PCA). The PCA has an advantage over other index analyses as it reduces the dimensionality of the data set and thus used to support multivariate cluster analysis. From the study, a total of 12 sediment samples were collected in both seasons across six sampling location and pollution indexes indicated three things: firstly, the metal distribution profile in the sediment showed that the heavy metals analysed for were lower than the maximum allowable limits stipulated by Department of Petroleum Resources (DPR); secondly, minor to extremely severe significant levels of enrichment and thirdly, practically uncontaminated to a moderately contaminated degree of contamination in Ogbere River during the study period. The PCA is considered more sensitive in the analysis of benthic changes and as well as sediment quality. However, the heavy metal assessment indices are not only used for sediment quality. Biological testing and ecological analysis of existing community related to sediment contamination are further recommended in River Ogbere.

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Sex‐specific affinity for redox‐active metals influences antioxidant responses of Callinectes amnicola (blue crab) populations in littoral and open water habitats of a tropical coastal lagoon

Jerome

Hassan

Chukwuka³

2017

Marine Ecology

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The critical role of ecological preferences and opportunity in determining contaminant uptake and adaptive responses of sexes in the wild is still poorly understood. This ecological relationship was investigated by measuring metal bioaccumulation and antioxidant activity in male and female blue crab populations from open water habitat and the littoral/inter‐tidal zone of the Lagos Lagoon. A total of 741 samples of blue crab (littoral zone: 263 females, 137 males; open water zone, 230 females, 111 males) was collected monthly over 24 months (January 2010–January 2012) from each site and the measurements of morphometric features (wet weight, carapace length, carapace width) were recorded; condition index, metal (redox active: Cu, Zn, redox inactive: Pb, Cd) concentration in tissues (gills, hepatopancreas, gonads and muscle) and antioxidant activity (superoxide dismutase, reduced glutathione, glutathione peroxidase, catalase and malondialdehyde) were measured for each sex. Monthly sediment samples for both habitats were also analysed for metals using standard methods. Female crabs were significantly larger (p < .05) with a better condition index than the male crabs across sites and seasons, while higher oxidative damage was recorded in male crabs in the littoral zone compared to the open water zone. The results show that there was a negative association between antioxidant activity and lipid peroxidation; a negative relationship between concentrations of redox‐inactive metals (Pb and Cd) and antioxidant activity in male crab tissues; and a positive relationship between uptake of a redox‐active metal (Cu) and antioxidant activity in female crab tissues. Although these trends suggest sex‐specific toxicity, they also associate redox‐inactive metals with the downregulation of antioxidant activity and oxidative stress. Furthermore, the higher condition index of females corroborates the possibility of sex‐specific toxicity, while the larger‐sized females compared to males suggests size‐sexual dimorphism in the blue crab populations. The site‐specific oxidative damage between sexes may be attributed to the different complexity of both habitats, which affords different ecological opportunities for the sexes.

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Diversity of the edible fishes of the Lagos Lagoon, Nigeria and the public health concerns based on their Lead (Pb) content

Cited by 4 publications

References 7 publications

Comparative Investigation of Total, Recoverable and Bioavailable Fractions of Sediment Metals and Metalloids in the Lagos Harbour and Lagoon System

Comparative Investigation of Total, Recoverable and Bioavailable Fractions of Sediment Metals and Metalloids in the Lagos Harbour and Lagoon System

Multivariate analysis of sediment quality in River Ogbere, Ibadan, South-West Nigeria

Sex‐specific affinity for redox‐active metals influences antioxidant responses of Callinectes amnicola (blue crab) populations in littoral and open water habitats of a tropical coastal lagoon

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