| Factors influencing the distribution of Myxobolus cerebralis, the causative agent of whirling disease, in the Cache la Poudre River, Colorado. | |
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MedLine Citation:
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PMID: 12093042 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
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Authors:
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M Brady Allen; Eric P Bergersen |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Diseases of aquatic organisms Volume: 49 ISSN: 0177-5103 ISO Abbreviation: Dis. Aquat. Org. Publication Date: 2002 Apr |
Date Detail:
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Created Date: 2002-07-02 Completed Date: 2002-10-17 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 8807037 Medline TA: Dis Aquat Organ Country: Germany |
Other Details:
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Languages: eng Pagination: 51-60 Citation Subset: IM |
Affiliation:
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Colorado Cooperative Fish and Wildlife Research Unit, Colorado State University, Fort Collins 80532, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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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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