Dataset Detail
Dataset: Prevalence of Infection in Rainbow Trout Under Different Flow Rates
| Project: Assessment of the risk of Myxobolus cerebralis Introduction as a Result of Straying Adult Steelhead and Spring Chinook Salmon in the Columbia River Basin
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| Dataset Abstract: Myxospores were introduced to artificial stream channels with different flow regimes (slow and fast). Rainbow trout sac-fry were added to each channel for one-week exposures; afterwards, a quantitative PCR (QPCR) assay was performed for Myxobolus cerebralis. Data show the percentage of fry that tested positive by QPCR for Myxobolous cerebralis. | |
| Significance of Results: The percentage of rainbow trout fry that tested positive by QPCR for Myxobolus cerebralis was affected by flow rate. There was a statistical difference in the mean number of fish infected over time between the two flows. | |
| Relevance to Managers: The larger study demonstrates that water flow rate (even a 100 fold difference) has a significant effect on the propagation of M. cerebralis and its impact on its fish host. Thus, in a system where water release is managed by dams or draw-off for agriculture or other uses, flow can be used to reduce effects of the parasite. This study suggests that even small increases in flow in critical low-flow habitats can significantly reduce infection in both hosts (fish and worms). | |
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