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Intra-Annual Changes in Waterborne Nanophyetus salmincola
P K Hershberger1, R L Powers2, B L Besijn1
1U.S. Geological Survey, Western Fisheries Research Center, Marrowstone Marine Field Station, 616 Marrowstone Point Road, Nordland, Washington, 98358, USA.
Journal of Aquatic Animal Health
|May 21, 2019
Summary
Waterborne Nanophyetus salmincola concentrations in Big Soos Creek peak in fall, coinciding with increased streamflow and higher infection pressure in Coho Salmon. These parasite levels decrease in winter and rise again in spring/summer.
Area of Science:
- Environmental Science
- Parasitology
- Ecology
Background:
- Nanophyetus salmincola is a parasite that affects aquatic ecosystems.
- Understanding its environmental dynamics is crucial for managing fish health.
Purpose of the Study:
- To analyze the intra-annual variations in waterborne Nanophyetus salmincola concentrations.
- To correlate parasite levels with environmental factors and host infection.
Main Methods:
- Daily water sampling and DNA quantification (gene copies/L) for N. salmincola.
- Detection of live N. salmincola cercariae in water samples.
- Assessment of parasite density in Coho Salmon tissues.
Main Results:
- Waterborne N. salmincola peaked in fall (Oct-Nov 2016), decreased in winter, and increased in spring/summer.
- High N. salmincola DNA correlated with live cercariae and increased streamflow.
- Peak parasite levels in water corresponded with higher tissue parasite loads in Coho Salmon.
Conclusions:
- Seasonal variations in streamflow significantly influence N. salmincola waterborne concentrations and infection pressure.
- Fall high water events pose the greatest risk for N. salmincola infections in aquatic hosts like Coho Salmon.
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