Susceptibility of Juvenile and Yearling Bull Trout to Myxobolus cerebralis and Effects of Sustained Parasite Challenges |
| |
| Abstract: | Abstract Evaluation of the susceptibility of bull trout Salvelinus confluentus fry to Myxobolus cerebralis infection using two different laboratory challenge models demonstrated that the method of administering the exposure dose affected infection prevalence. Administration of a low parasite dose (500 per fish) in a single exposure did not establish infection, but when the same cumulative dose was administered over 21 d the prevalence of infection was 45%. The results of challenges at a high exposure dose (5,000 per fish) were similar, infections being detected in 24% of the fish receiving a single dose and 40% of those administered the same dose in multiple exposures. Clinical disease was not detected in fish exposed via either challenge method. The susceptibility of yearling bull trout was tested by means of a single high dose of 10,000 per fish, and infection was detected in only 5% of those fish. |
| |
| Keywords: | |
|
|
