Document Detail

Morphological organ alterations and infectious diseases in brown trout Salmo trutta and rainbow trout Oncorhynchus mykiss exposed to polluted river water.
MedLine Citation:
PMID:  11383563     Owner:  NLM     Status:  MEDLINE    
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.
H Schmidt-Posthaus; D Bernet; T Wahli; P Burkhardt-Holm
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Diseases of aquatic organisms     Volume:  44     ISSN:  0177-5103     ISO Abbreviation:  Dis. Aquat. Org.     Publication Date:  2001 Apr 
Date Detail:
Created Date:  2001-05-31     Completed Date:  2001-07-12     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8807037     Medline TA:  Dis Aquat Organ     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  161-70     Citation Subset:  IM    
Centre for Fish and Wildlife Health, Institute of Animal Pathology, University of Bern, Switzerland.
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MeSH Terms
Fish Diseases / etiology*,  pathology
Fresh Water*
Gills / pathology
Kidney / pathology
Kidney Diseases / pathology,  veterinary
Liver / pathology
Oncorhynchus mykiss*
Species Specificity
Water Pollution / adverse effects*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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