EPIZOOTIOLOGY OF MYXOBOLUS CEREBRALIS, THE CAUSATIVE AGENT OF SALMONID WHIRLING DISEASE IN THE ROCK CREEK DRAINAGE OF WEST-CENTRAL MONTANA: 2004-2008. The Journal of parasitology [J Parasitol] Journal article | | Title | EPIZOOTIOLOGY OF MYXOBOLUS CEREBRALIS, THE CAUSATIVE AGENT OF SALMONID WHIRLING DISEASE IN THE ROCK CREEK DRAINAGE OF WEST-CENTRAL MONTANA: 2004-2008. | | Author(s) | Granath WO, Vincent R | | Source | J Parasitol 2009 Nov 5.:1. | | Abstract | Whirling disease, caused by the myxozoan parasite Myxobolus cerebralis, remains a serious health threat to salmonid fish in the western U.S. A previously published study on the epizootiology of whirling disease in the Rock Creek watershed of west-central Montana, conducted from 1998 to 2003, showed that the intensity of M. cerebralis infections in sentinel trout increased significantly throughout the drainage and that the range of M. cerebralis had expanded considerably. In addition, the parasite had apparently caused a dramatic decline in rainbow trout densities but the brown trout population numbers had increased. This earlier study was continued from 2004 to 2008 and results are reported here. It now appears that disease intensity may have peaked in 2006 and is on the decline. The decline can not be directly attributed to a change in the prevalence of M. cerebralis-infected T. tubifex as these numbers remained statistically the same from 1998 to 2008. Similarly, changes in water temperature and water flow do not account for the decrease in disease intensity. However, it is possible that rainbow trout are developing some resistance to the parasite, a phenomenon recently documented to be occurring in the Willow Creek Reservoir of southwest Montana. | | Language | ENG | | Pub Type(s) | JOURNAL ARTICLE
| | PubMed ID | 19891515 |
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