Document Detail


Factors influencing the distribution of Myxobolus cerebralis, the causative agent of whirling disease, in the Cache la Poudre River, Colorado.
MedLine Citation:
PMID:  12093042     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Oligochaetes, triactinomyxons (TAMs), and age-0 trout were sampled in the upper Cache la Poudre River, Colorado, to determine the distribution of Myxobolus cerebralis during 1997 and 1998. Densities of the intermediate host, the oligochaete Tubifex tubifex, were 3.5 orders of magnitude higher in the M. cerebralis-infected Poudre Rearing Unit (PRU) trout rearing ponds than at any of the river sampling reaches. Oligochaetes, including T. tubifex, were rare in the river (1 oligochaete m(-2)), except in a few stream side alcoves and eddies (50 oligochaete m(-2)). Species composition of oligochaetes in the river reaches was more diverse than in the PRU. Tubifex tubifex constituted 50% or less of the oligochaete community in the river and 98% in the PRU. Infection rates of T tubifex were 1% in the area above the PRU, 2% in the PRU, and 6% below the PRU. An increased M. cerebralis intensity of infection in age-0 trout below the PRU could not be attributed entirely to the high numbers of TAMs in its effluent (3.7 TAMs l(-1)). Low densities of TAMs ranging from 0 to 0.2 TAMs l(-1) were found in the river reaches, yet nearly all of the age-0 trout were infected soon after emergence. This suggests that very few TAMs, as measured by filtration, need be present in the water column to bring about infection in the majority of trout present. This also indicates that the parasite can persist and potentially cause reduced juvenile trout recruitment in cold, oligotrophic, sediment poor, high-gradient streams.
Authors:
M Brady Allen; Eric P Bergersen
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Diseases of aquatic organisms     Volume:  49     ISSN:  0177-5103     ISO Abbreviation:  Dis. Aquat. Org.     Publication Date:  2002 Apr 
Date Detail:
Created Date:  2002-07-02     Completed Date:  2002-10-17     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8807037     Medline TA:  Dis Aquat Organ     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  51-60     Citation Subset:  IM    
Affiliation:
Colorado Cooperative Fish and Wildlife Research Unit, Colorado State University, Fort Collins 80532, USA.
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MeSH Terms
Descriptor/Qualifier:
Age Factors
Animals
Aquaculture
Colorado / epidemiology
Eukaryota / isolation & purification*
Fish Diseases / epidemiology*,  parasitology
Fresh Water / parasitology
Oligochaeta / parasitology*
Population Density
Prevalence
Protozoan Infections, Animal / epidemiology*,  parasitology
Species Specificity
Trout / parasitology*

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


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