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Morphological organ alterations and infectious diseases in brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss exposed to polluted river water

Schmidt-Posthaus, H. and Bernet, D. and Wahli, T. and Burkhardt-Holm, P.. (2001) Morphological organ alterations and infectious diseases in brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss exposed to polluted river water. Diseases of Aquatic Organisms, 44 (3). pp. 161-170.

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Official URL: http://edoc.unibas.ch/dok/A5252596

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Abstract

Poor water quality is discussed as a major factor causing a decline of brown trout populations in Swiss rivers. For our study we have chosen a river in the Swiss midlands, where the brown trout population has decreased dramatically during the last 10 yr and where feral fish have shown distinctive pathological alterations. The objective of our study was to investigate whether river water may be responsible for impaired fish health leading to an increased mortality in the river. In an active monitoring program, groups of brown and rainbow trout were exposed to polluted river water for 24 mo. Fish held in tap water served as a reference. Mortality, macroscopic and histopathologic changes, and infectious agents were investigated. Compared with the reference group, high mortality rates and severe pathological alterations of the inner organs were observed in fish held in river water. Especially gills, liver and kidney of these fish showed significantly higher changes than fish from tap water. These changes were dominated by degenerative and inflammatory reactions. Additionally, several infectious agents were diagnosed in fish exposed to river water. The most important findings were furunculosis and proliferative kidney disease. Brown trout seemed to be more sensitive than rainbow trout to environmental stress and infectious agents.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Mensch Gesellschaft Umwelt MGU > Aquatische ├ľkologie (Holm)
UniBasel Contributors:Holm, Patricia
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Inter-Research
ISSN:0177-5103
e-ISSN:1616-1580
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:13 Nov 2017 07:57
Deposited On:22 Mar 2012 13:57

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