Occurrence of oestrogenic pollutants and widespread feminisation of male tilapia in peri-urban dams in Bulawayo, Zimbabwe

C. Teta*, B. F. Holbech, L. Norrgren, Y. S. Naik

*Kontaktforfatter for dette arbejde

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Peri-urban water bodies are at risk from excessive pollution as they are direct sinks for urban effluents. The occurrence of oestrogenic and androgenic endocrine disrupting chemicals (EDCs) in effluents and water bodies around the city of Bulawayo, Zimbabwe, and their effects on wild fish was investigated in 2013. Effluent and water were sampled from sewage treatment plants, an urban stream, and effluent-polluted dams, and were compared with a ‘pristine’ dam upstream of Bulawayo. Organic pollutants were extracted by solid-phase extraction and tested for EDCs using a yeast oestrogen/androgen screen. Oestrogenic and androgenic potencies were expressed as 17β-oestradiol equivalent (EEq) or dihydrotestosterone equivalent (TEq). Tilapia and catfish from the dams were analysed for gonado-somatic indices and testis histopathology. Effluents from STPs, which directly flow into Umguza Dam, had EEq of 33 ng l−1 and 55 ng l−1, respectively. Umguza Dam, Khami Dam and Matsheumhlope Stream had EEqs of 237 ng l–1, 9 ng l−1 and 2 ng l−1, respectively. Androgenic activity was detected in only one STP (TEq = 93 ng l−1). Tilapia sampled from effluent-polluted dams had high incidences of testis-ova, but catfish had no signs of reproductive dysfunction. These findings underscore the need for greater attention to EDCs in developing countries where there is scant literature regarding their occurrence and impacts.

OriginalsprogEngelsk
TidsskriftAfrican Journal of Aquatic Science
Vol/bind43
Udgave nummer1
Sider (fra-til)17-26
ISSN1608-5914
DOI
StatusUdgivet - 2018

Fingeraftryk

feminization
dams (hydrology)
Zimbabwe
tilapia (common name)
dam
effluents
pollutants
effluent
pollutant
endocrine-disrupting chemicals
catfish
body water
testes
histopathology
sewage treatment
androgen
wild fish
gonadosomatic index
solid phase extraction
androgens

Citer dette

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title = "Occurrence of oestrogenic pollutants and widespread feminisation of male tilapia in peri-urban dams in Bulawayo, Zimbabwe",
abstract = "Peri-urban water bodies are at risk from excessive pollution as they are direct sinks for urban effluents. The occurrence of oestrogenic and androgenic endocrine disrupting chemicals (EDCs) in effluents and water bodies around the city of Bulawayo, Zimbabwe, and their effects on wild fish was investigated in 2013. Effluent and water were sampled from sewage treatment plants, an urban stream, and effluent-polluted dams, and were compared with a ‘pristine’ dam upstream of Bulawayo. Organic pollutants were extracted by solid-phase extraction and tested for EDCs using a yeast oestrogen/androgen screen. Oestrogenic and androgenic potencies were expressed as 17β-oestradiol equivalent (EEq) or dihydrotestosterone equivalent (TEq). Tilapia and catfish from the dams were analysed for gonado-somatic indices and testis histopathology. Effluents from STPs, which directly flow into Umguza Dam, had EEq of 33 ng l−1 and 55 ng l−1, respectively. Umguza Dam, Khami Dam and Matsheumhlope Stream had EEqs of 237 ng l–1, 9 ng l−1 and 2 ng l−1, respectively. Androgenic activity was detected in only one STP (TEq = 93 ng l−1). Tilapia sampled from effluent-polluted dams had high incidences of testis-ova, but catfish had no signs of reproductive dysfunction. These findings underscore the need for greater attention to EDCs in developing countries where there is scant literature regarding their occurrence and impacts.",
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author = "C. Teta and Holbech, {B. F.} and L. Norrgren and Naik, {Y. S.}",
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pages = "17--26",
journal = "African Journal of Aquatic Science",
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Occurrence of oestrogenic pollutants and widespread feminisation of male tilapia in peri-urban dams in Bulawayo, Zimbabwe. / Teta, C.; Holbech, B. F.; Norrgren, L.; Naik, Y. S.

I: African Journal of Aquatic Science, Bind 43, Nr. 1, 2018, s. 17-26.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Occurrence of oestrogenic pollutants and widespread feminisation of male tilapia in peri-urban dams in Bulawayo, Zimbabwe

AU - Teta, C.

AU - Holbech, B. F.

AU - Norrgren, L.

AU - Naik, Y. S.

PY - 2018

Y1 - 2018

N2 - Peri-urban water bodies are at risk from excessive pollution as they are direct sinks for urban effluents. The occurrence of oestrogenic and androgenic endocrine disrupting chemicals (EDCs) in effluents and water bodies around the city of Bulawayo, Zimbabwe, and their effects on wild fish was investigated in 2013. Effluent and water were sampled from sewage treatment plants, an urban stream, and effluent-polluted dams, and were compared with a ‘pristine’ dam upstream of Bulawayo. Organic pollutants were extracted by solid-phase extraction and tested for EDCs using a yeast oestrogen/androgen screen. Oestrogenic and androgenic potencies were expressed as 17β-oestradiol equivalent (EEq) or dihydrotestosterone equivalent (TEq). Tilapia and catfish from the dams were analysed for gonado-somatic indices and testis histopathology. Effluents from STPs, which directly flow into Umguza Dam, had EEq of 33 ng l−1 and 55 ng l−1, respectively. Umguza Dam, Khami Dam and Matsheumhlope Stream had EEqs of 237 ng l–1, 9 ng l−1 and 2 ng l−1, respectively. Androgenic activity was detected in only one STP (TEq = 93 ng l−1). Tilapia sampled from effluent-polluted dams had high incidences of testis-ova, but catfish had no signs of reproductive dysfunction. These findings underscore the need for greater attention to EDCs in developing countries where there is scant literature regarding their occurrence and impacts.

AB - Peri-urban water bodies are at risk from excessive pollution as they are direct sinks for urban effluents. The occurrence of oestrogenic and androgenic endocrine disrupting chemicals (EDCs) in effluents and water bodies around the city of Bulawayo, Zimbabwe, and their effects on wild fish was investigated in 2013. Effluent and water were sampled from sewage treatment plants, an urban stream, and effluent-polluted dams, and were compared with a ‘pristine’ dam upstream of Bulawayo. Organic pollutants were extracted by solid-phase extraction and tested for EDCs using a yeast oestrogen/androgen screen. Oestrogenic and androgenic potencies were expressed as 17β-oestradiol equivalent (EEq) or dihydrotestosterone equivalent (TEq). Tilapia and catfish from the dams were analysed for gonado-somatic indices and testis histopathology. Effluents from STPs, which directly flow into Umguza Dam, had EEq of 33 ng l−1 and 55 ng l−1, respectively. Umguza Dam, Khami Dam and Matsheumhlope Stream had EEqs of 237 ng l–1, 9 ng l−1 and 2 ng l−1, respectively. Androgenic activity was detected in only one STP (TEq = 93 ng l−1). Tilapia sampled from effluent-polluted dams had high incidences of testis-ova, but catfish had no signs of reproductive dysfunction. These findings underscore the need for greater attention to EDCs in developing countries where there is scant literature regarding their occurrence and impacts.

KW - androgens

KW - developing countries

KW - endocrine disrupting chemicals

KW - fish reproduction

KW - oestrogens

KW - urban effluent

U2 - 10.2989/16085914.2017.1423269

DO - 10.2989/16085914.2017.1423269

M3 - Journal article

VL - 43

SP - 17

EP - 26

JO - African Journal of Aquatic Science

JF - African Journal of Aquatic Science

SN - 1608-5914

IS - 1

ER -