The use of cestode parasites from the largemouth yellowfish, Labeobarbus kimberleyensis (Gilchrist and Thompson, 1913) in the Vaal Dam, South Africa as indicators of heavy metal bioaccumulation

Retief, N. R.; Avenant‐Oldewage, Annemariè; Preez, Hein du

doi:10.1016/j.pce.2006.08.004

Cited by 33 publications

(21 citation statements)

References 12 publications

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“…Retief et al (2009) obtained the same results as in this study in terms of high levels in the dry period and less concentrations in sediments in the wet period. The authors explained that heavy rains and strong wind action increase flows and movement in the river and lake which disturbs the water and the bottom sediments.…”

Section: Figure 54: Mean Tal Concentrations In Sediments From All Thsupporting

confidence: 86%

“…Temporal or seasonal variations in bioaccumulation of heavy metals have been shown in various studies in different aquatic biota Coetzee et al, 2002;Rauf, 2009 Retief et al (2009) found out that metal bioaccumulation in benthic dwellers increased under low flows. This was generally attributed to the influence of variations in metal concentrations in the surrounding environment.…”

Section: Bioaccumulation Of Metals Over Timementioning

confidence: 97%

“…However, Seymore (1994) had different observations whereby there were reduced metal concentrations in the top surface dwellers in higher flows than low flows and this was explained by the author as being due to dilution effects which reduce the metal concentrations in the water environment. Another reason for seasonal variations in bioaccumulation is the variation in animal physiology (Retief et al, 2009). Retief et al, 2009 also reported the type of sex, changes in reproductive cycles and stress due to manipulations and adaptations to new environmental conditions as contributing factors to changes in uptake, storage and excretion by organisms of metals.…”

Section: Bioaccumulation Of Metals Over Timementioning

confidence: 99%

“…Another reason for seasonal variations in bioaccumulation is the variation in animal physiology (Retief et al, 2009). Retief et al, 2009 also reported the type of sex, changes in reproductive cycles and stress due to manipulations and adaptations to new environmental conditions as contributing factors to changes in uptake, storage and excretion by organisms of metals.…”

Section: Bioaccumulation Of Metals Over Timementioning

confidence: 99%

“…Several heavy metals have been studied worldwide and they include; mercury, lead, cadmium, zinc, aluminium, copper, among many others (Esmail et al, 2009). Findings from these metal pollution studies suggest that these metals are persistent in nature and tend to bioaccumulate and biomagnify in living organisms (Retief et al, 2009). Mostly, the top carnivores that include fish will have higher concentrations of the toxic metals much greater than the ambient water concentrations (Sarkar et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Impacts of alum residues from Morton Jaffray Water Works on water quality and fish, Harare, Zimbabwe

Muisa-Zikali

Hoko

Chifamba

2011

Physics and Chemistry of the Earth, Parts A/B/C

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Section: Figure 54: Mean Tal Concentrations In Sediments From All Thsupporting

confidence: 86%

Section: Bioaccumulation Of Metals Over Timementioning

confidence: 97%

Section: Bioaccumulation Of Metals Over Timementioning

confidence: 99%

Section: Bioaccumulation Of Metals Over Timementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Impacts of alum residues from Morton Jaffray Water Works on water quality and fish, Harare, Zimbabwe

Muisa-Zikali

Hoko

Chifamba

2011

Physics and Chemistry of the Earth, Parts A/B/C

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Effects of water quality on fish parasite biodiversity and physiological responses in the host fish Clarias gariepinus from a eutrophic lake subjected to acid mine drainage in South Africa

Latief,

Gilbert,

Avenant‐Oldewage

2024

Integr Envir Assess & Manag

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Elevated concentrations of contaminants have negative impacts on aquatic organisms and their parasites. Changes in parasite infections have been proposed as a technique for monitoring the health of aquatic ecosystems. Furthermore, alterations in physiological responses (biomarkers) of organisms have also been used to delineate ecosystem quality. Lake Heritage is situated along the Crocodile River in Muldersdrift, Gauteng, South Africa and is subject to contamination by acid mine drainage. Clarias gariepinus is a well‐studied bioindicator species and host to numerous endo and ectoparasites. The aims of this study were to delineate the health status of Lake Heritage through a multifaceted approach by comparing the water quality, biomarker responses and parasite biodiversity of C. gariepinus, compared to unexposed laboratory‐reared fish. Physical and chemical water quality parameters were determined with a hand‐held probe, test kits and element analysis with ICP‐MS. Biomarker responses in the gill, liver and muscle tissues from C. gariepinus were assessed for total protein, metallothioneins, superoxide dismutase and reduced glutathione concentrations and activities of acetylcholinesterase and catalase. Results for water quality variables showed higher pH, nitrate, hardness and copper levels compared to the South African Target Water Quality Guidelines. Catalase activity, and concentrations of superoxide dismutase and reduced glutathione showed a response in C. gariepinus to the water quality. Ectoparasites had lower prevalence and mean intensity than endoparasites. However, there were no differences in the physiological responses between infected and uninfected hosts. The study shows that the eutrophic conditions in Lake Heritage cause biomarker responses in the host when compared to host fish in laboratory conditions.

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Biomineralisation and metal sequestration in a crustacean ectoparasite infecting the gills of a freshwater fish

Latief,

Gilbert,

Avenant-Oldewage

2023

J Comp Physiol B

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It has been suggested that parasites are effective bioindicators as they are sensitive to environmental changes and, in some cases, accumulate trace elements in higher concentrations than their hosts. Accumulated elements sequester in different organs. In monogenean and crustacean ectoparasites, sclerotised structures and egg yolk appear to be the preferred site for element sequestration. In this study, the sequestration of trace elements; Mg, Al, Ca, Fe, Cu, and Zn in Lamproglena clariae was studied from two rivers. Adult L. clariae were collected from the gills of Clarias gariepinus from Lake Heritage in the Crocodile River and in the Vaal River below the Vaal Dam, South Africa. Collected parasites were flash frozen in liquid nitrogen and sectioned with a cryomicrotome. Sections were treated with Phen-Green to observe fluorescent signals. Trace elements in the parasite were analysed using a scanning electron microscope with an energy-dispersive spectroscope (SEM–EDS). Results showed more intense fluorescence signals in the exoskeleton compared to tissues, and in the egg yolk. Analysis by SEM–EDS confirmed the presence of elements in the parasite from both sites. Levels of Al were higher in L. clariae from the Vaal River than those from Lake Heritage, and Fe was higher in L. clariae from Lake Heritage. Element distribution patterns in the parasite matched those in the water from the sites. Unlike other crustaceans, regulation of metals in adult females of L. clariae does not occur through moulting, but high levels occurred in the yolk.

show abstract

The use of cestode parasites from the largemouth yellowfish, Labeobarbus kimberleyensis (Gilchrist and Thompson, 1913) in the Vaal Dam, South Africa as indicators of heavy metal bioaccumulation

Cited by 33 publications

References 12 publications

Impacts of alum residues from Morton Jaffray Water Works on water quality and fish, Harare, Zimbabwe

Impacts of alum residues from Morton Jaffray Water Works on water quality and fish, Harare, Zimbabwe

Effects of water quality on fish parasite biodiversity and physiological responses in the host fish Clarias gariepinus from a eutrophic lake subjected to acid mine drainage in South Africa

Biomineralisation and metal sequestration in a crustacean ectoparasite infecting the gills of a freshwater fish

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