Document Detail

Density of the waterborne parasite Ceratomyxa shasta and its biological effects on salmon.
MedLine Citation:
PMID:  22407689     Owner:  NLM     Status:  MEDLINE    
The myxozoan parasite Ceratomyxa shasta is a significant pathogen of juvenile salmonids in the Pacific Northwest of North America and is limiting recovery of Chinook (Oncorhynchus tshawytscha) and coho (O. kisutch) salmon populations in the Klamath River. We conducted a 5-year monitoring program that comprised concurrent sentinel fish exposures and water sampling across 212 river kilometers of the Klamath River. We used percent mortality and degree-days to death to measure disease severity in fish. We analyzed water samples using quantitative PCR and Sanger sequencing, to determine total parasite density and relative abundance of C. shasta genotypes, which differ in their pathogenicity to salmonids. We detected the parasite throughout the study zone, but parasite density and genetic composition fluctuated spatially and temporally. Chinook and coho mortality increased with density of their specific parasite genotype, but mortality-density thresholds and time to death differed. A lethality threshold of 40% mortality was reached with 10 spores liter(-1) for Chinook but only 5 spores liter(-1) for coho. Parasite density did not affect degree-days to death for Chinook but was negatively correlated for coho, and there was wider variation among coho individuals. These differences likely reflect the different life histories and genetic heterogeneity of the salmon populations. Direct quantification of the density of host-specific parasite genotypes in water samples offers a management tool for predicting host population-level impacts.
Sascha L Hallett; R Adam Ray; Charlene N Hurst; Richard A Holt; Gerri R Buckles; Stephen D Atkinson; Jerri L Bartholomew
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-03-09
Journal Detail:
Title:  Applied and environmental microbiology     Volume:  78     ISSN:  1098-5336     ISO Abbreviation:  Appl. Environ. Microbiol.     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-04-26     Completed Date:  2012-08-15     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  7605801     Medline TA:  Appl Environ Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3724-31     Citation Subset:  IM    
Department of Microbiology, Oregon State University, Corvallis, Oregon, USA.
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MeSH Terms
Fish Diseases / mortality,  parasitology*,  pathology
Myxozoa / classification,  genetics,  isolation & purification*,  pathogenicity*
Northwestern United States
Parasitic Diseases, Animal / mortality,  parasitology*,  pathology
Salmonidae / parasitology*
Severity of Illness Index
Survival Analysis
Water / parasitology*
Reg. No./Substance:

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

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