Honors College Thesis
 

Lack of Seasonality for Cercariae of Nanophyetus salmincola in the Snail Juga silicula

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  • Nanophyetus salmincola is a well-studied parasite of their definitive mammal hosts. However, the conditions that signal the time for shedding of N. salmincola cercariae from their first host, the juga snail (Juga silicula), is not fully understood. A digenetic trematode indigenous to the American Pacific Northwest, N. salmincola can be found in nearly every stream in the coastal region and the Columbia River where the intermediate snail host can be found. In order to assess if seasonality or temperature conditions are involved in the shedding of cercariae, samples were taken monthly from the upper South Santiam River and Oak Creek, Oregon. These locations were chosen to represent cold and warm water conditions, respectively, over twelve months. Snails were brought into the laboratory to be assessed for shedding percentages of the groups. I found that there is no clear shedding pattern with respect to time of year or water temperature of N. salmincola from the intermediate host juga snail. This implies that snails could be infective to fish not just in summer months as formerly thought.
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