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Endocrine Disruption in Largemouth Bass (Micropterus Salmoides) from a PCB-Contaminated Reservoir.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Endocrine Disruption in Largemouth Bass (Micropterus Salmoides) from a PCB-Contaminated Reservoir./
作者:	LaPlaca, Stephanie B.
面頁冊數:	1 online resource (103 pages)
附註:	Source: Masters Abstracts International, Volume: 56-05.
標題:	Environmental science. -
電子資源:	click for full text (PQDT)
ISBN:	9780355072433

Endocrine Disruption in Largemouth Bass (Micropterus Salmoides) from a PCB-Contaminated Reservoir.
LaPlaca, Stephanie B.

Endocrine Disruption in Largemouth Bass (Micropterus Salmoides) from a PCB-Contaminated Reservoir. - 1 online resource (103 pages)

Source: Masters Abstracts International, Volume: 56-05.

Thesis (M.S.)--University of South Carolina, 2017.

Includes bibliographical references

There are numerous cases of intersex condition in fish, specifically immature oocytes in testicular tissue, documented in recent literature. Typically, these cases identify a point source input of endocrine disrupting compounds impacting the fish, such as wastewater treatment effluent. Legacy contaminants such as polychlorinated biphenyls (PCBs) have been suggested as endocrine disruptors in fish species. The objective of this study was to assess endocrine disruption in wild largemouth bass (Micropterus salmoides) from exposure to PCBs at a Superfund site in South Carolina on Lake Hartwell (SV-107), where high levels of PCBs in sediment and fish tissue samples have been detected for many years. A less severely PCB-contaminated site on Lake Hartwell (SV-535) and a reference site upstream on Lake Keowee (SV-311) were also sampled. Endocrine disruption in fish was measured by analyzing plasma vitellogenin (VTG), intersex severity, and intersex prevalence. Measurable levels of plasma VTG, an egg yolk precursor protein, were detected in male fish from all sites. There were no cases of intersex observed in females collected for this study. Intersex in males manifested as testicular oocytes (TO). Histological analysis indicated that testicular oocytes were present in 23 of 33 (69%) of male largemouth bass sampled and was found in fish from all three sites. These data suggest there may be a significant association between PCB concentration in fish tissue and endocrine disruption in the form of VTG production, intersex severity, and intersex prevalence in male largemouth bass.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780355072433Subjects--Topical Terms:

1179128
Environmental science.
Index Terms--Genre/Form:

554714
Electronic books.

Endocrine Disruption in Largemouth Bass (Micropterus Salmoides) from a PCB-Contaminated Reservoir.
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504 $a Includes bibliographical references
520 $a There are numerous cases of intersex condition in fish, specifically immature oocytes in testicular tissue, documented in recent literature. Typically, these cases identify a point source input of endocrine disrupting compounds impacting the fish, such as wastewater treatment effluent. Legacy contaminants such as polychlorinated biphenyls (PCBs) have been suggested as endocrine disruptors in fish species. The objective of this study was to assess endocrine disruption in wild largemouth bass (Micropterus salmoides) from exposure to PCBs at a Superfund site in South Carolina on Lake Hartwell (SV-107), where high levels of PCBs in sediment and fish tissue samples have been detected for many years. A less severely PCB-contaminated site on Lake Hartwell (SV-535) and a reference site upstream on Lake Keowee (SV-311) were also sampled. Endocrine disruption in fish was measured by analyzing plasma vitellogenin (VTG), intersex severity, and intersex prevalence. Measurable levels of plasma VTG, an egg yolk precursor protein, were detected in male fish from all sites. There were no cases of intersex observed in females collected for this study. Intersex in males manifested as testicular oocytes (TO). Histological analysis indicated that testicular oocytes were present in 23 of 33 (69%) of male largemouth bass sampled and was found in fish from all three sites. These data suggest there may be a significant association between PCB concentration in fish tissue and endocrine disruption in the form of VTG production, intersex severity, and intersex prevalence in male largemouth bass.
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