Intersex in feral indigenous freshwater Oreochromis mossambicus, from various parts in the Luvuvhu River, Limpopo Province, South Africa

Barnhoorn, I.E.J.; Dyk, J C van; Pieterse, G. M.; Bornman, M. S.

doi:10.1016/j.ecoenv.2010.07.026

Cited by 48 publications

(24 citation statements)

References 34 publications

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“…The fact that testicular oocytes were only identified in O. mossambicus males in the current study suggests possible species specific sensitivity. A study by Barnhoorn et al (2010) also showed the presence of testicular oocytes in O. mossambicus while this condition was absent in C.…”

Section: Discussionmentioning

confidence: 92%

“…This condition in fish has been associated with exposure to potential endocrine disrupting chemicas (EDCs) (Kime et al 1999;Cheek et al 2001;Zaroogian et al 2001;Jobling and Tyler, 2003;Barnhoorn et al 2004Barnhoorn et al , 2010Marchand et al 2008;Pieterse et al 2010). These include organochlorines, polychlorinated biphenols and phthalates (Kime et al 1999;Menditto and Turrio-Baldassarri 1999).…”

Section: Discussionmentioning

confidence: 99%

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Histopathological changes in two potential indicator fish species from a hyper-eutrophic freshwater ecosystem in South Africa: a baseline study

Marchand

Dyk

Barnhoorn

et al. 2012

African Journal of Aquatic Science

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SummaryHistopathological changes were identified in selected target organs from two freshwater fish species, Clarias gariepinus and Oreochromis mossambicus, inhabiting a hyper-eutrophic freshwater aquatic system. The approach was to use a histology-based fish health assessment protocol which included a semi-quantitative histopathological assessment of six target organs (gills, liver, ovaries, testes, kidney, and heart). Results of water quality analysis showed selected variables to be above the recommended levels including pH, ammonia, nitrogen, chloride, and phosphorus. A number of histopathological alterations were identified in the target organs of both species, with the highest number observed in the liver. Species differences were identified in terms of the severity of the alterations within all the organs, with most alterations being regressive in nature. The results of this study provide valuable baseline data for two indicator species inhabiting a hyper-eutrophic system that could be useful for future bio-monitoring studies.2

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Histopathological changes in two potential indicator fish species from a hyper-eutrophic freshwater ecosystem in South Africa: a baseline study

Marchand

Dyk

Barnhoorn

et al. 2012

African Journal of Aquatic Science

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“…2009). In a subsequent study, Barnhoorn et al. (2010) reported intersex in 49% of O. mossambicus , indicating that DDT residues are likely involved in the development of intersex.…”

Section: Ddt Residues and Effectsmentioning

confidence: 89%

Environmental Pollutants and Diseases of Sexual Development in Humans and Wildlife in South Africa: Harbingers of Impact on Overall Health?

Bornman

Bouwman

2012

Reprod Domestic Animals

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ContentsThis study deals with disorders of sexual development in humans, wildlife and animals in an urban nature reserve (RNR) and a currently DDT-sprayed malarial area. High levels of oestrogenic chemical residues in water, sediment and tissue; skewed sex ratios; reduced biodiversity; gonadal malformations in sharptooth catfish and freshwater snails; intersex in catfish; and impaired spermatogenesis in catfish and striped mouse are of serious concern in the RNR. Persistent eggshell thinning in African darter eggs, intersex in male Mozambican tilapia, follicular atresia in females and impaired spermatogenesis in males following laboratory exposure of parent fish to environmentally relevant DDT and DDE concentrations, and abnormalities in freshwater snails were found in the DDT-sprayed area. Human studies related to DDT exposure indicated impaired semen quality, a weak association with sperm chromatin defects and higher risks for external urogenital birth defects in those who were born to mothers whose houses were sprayed and those who were homemakers (stay at home mother) instead of being employed. These findings indicate that diseases of sexual development occurred in both human and wildlife populations exposed to environmental endocrine disruptor chemicals in South Africa. The chemical mixtures, possibly related to disorders of sexual differentiation (DSD), were very different between the two. However, DSD occurred concurrently in the malarial area, possibly indicating that humans and wildlife shared exposures. Moreover, it emphasizes the importance of suspecting disease in the other when disease is found in either human or wildlife populations.

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“…Barnhoorn et al. () found that fish exposed to EDCs such as NP had primary oocytes present in the testes, which was not found in the HD. Exposure to NP can alter reproduction, but male fish placed in uncontaminated water for 3 months were able to recover (Cardinali et al., ).…”

Section: Discussionmentioning

confidence: 99%

Sperm motility and testicular histology as reproductive indicators inClarias gariepinusfrom an eutrophic impoundment, South Africa

2012

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Summary Testicular histology and sperm motility were studied as possible reproductive indicators of the reproductive potential for the wild, indigenous fish species (Clarias gariepinus) from an eutrophic impoundment, the Hartbeespoort Dam (HD) in South Africa. Parameters used as indicators include: GSI, testes histology and staging of the testes. Computer assisted sperm analysis (CASA), was used to assess sperm motility parameters including percent motile sperm (% MOT), velocity curvilinear (VCL μm s−1) and progression (PROG). These parameters were compared to C. gariepinus sampled at a reference site, the Marico Bosveld dam (MD). Water samples from both dams were analysed for metals and selected endocrine disrupting chemicals (EDCs). The water samples in the HD had notable high levels of selenium as well as nonylphenol and Di‐n‐Butyl phthalate. Macroscopic differences in the testes were found comparing the HD and MD. Fish from HD testes showed abnormalities regarding the interstitial tissue possibly due to proliferation of connective tissue. The CASA results showed no significant (P ≥ 0.05) differences for the% MOT of fish spermatozoa between HD and MD. The VCL and PROG of sperm had significant (P < 0.05) differences in fish between HD‐LF, HD‐HF and MD. It here fore seems that the increased environmental pollutants in the HD had an effect on reproductive status and sperm motility parameters of C. gariepinus when compared to the reference site MD.

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Intersex in feral indigenous freshwater Oreochromis mossambicus, from various parts in the Luvuvhu River, Limpopo Province, South Africa

Cited by 48 publications

References 34 publications

Histopathological changes in two potential indicator fish species from a hyper-eutrophic freshwater ecosystem in South Africa: a baseline study

Histopathological changes in two potential indicator fish species from a hyper-eutrophic freshwater ecosystem in South Africa: a baseline study

Environmental Pollutants and Diseases of Sexual Development in Humans and Wildlife in South Africa: Harbingers of Impact on Overall Health?

Sperm motility and testicular histology as reproductive indicators inClarias gariepinusfrom an eutrophic impoundment, South Africa

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