Susceptibility of Nanophyetus salmincola cercariae to formalin, hydrogen peroxide, and seawater
Journal of Aquatic Animal Health
By: Paul Hershberger, Bonnie Besijn, Ashley Mackenzie, and Mallory Wilmot
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Abstract
The ability of formalin, PEROX‐AID (hydrogen peroxide), and seawater to kill waterborne Nanophyetus salmincola cercariae was evaluated in vitro. Newly emerged cercariae survived for extended periods in freshwater, with 53–73% survival occurring in negative control groups after 24 h. Exposure to dilutions of formalin reduced this survival time, with 0% of cercariae surviving after 30 min in 450 μL/L, 40 min in 225 μL/L, and 300 min in 113 μL/L. Exposure to PEROX‐AID (hydrogen peroxide) for 1 h resulted in reduced cercarial survival (16.4%) only at the highest concentration (100 μL/L), compared with 100% survival in the untreated controls and all lesser concentrations. Exposure to dilutions of seawater resulted in reduced cercarial survival only at high salinities (15.2–30.3‰), where 10‐min exposures resulted in 0–20% survival. These results provide insights into options for prophylactic water treatment at salmonid enhancement facilities that experience high mortalities due to infections with Nanophyetus salmincola. Further, the intolerance of live cercariae to high salinities indicates that exposure to fish occurs primarily in the freshwater portions of watersheds.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Susceptibility of Nanophyetus salmincola cercariae to formalin, hydrogen peroxide, and seawater |
| Series title | Journal of Aquatic Animal Health |
| DOI | 10.1002/aah.10050 |
| Volume | 31 |
| Issue | 1 |
| Year Published | 2018 |
| Language | English |
| Publisher | American Fisheries Society |
| Contributing office(s) | Western Fisheries Research Center |
| Description | 5 p. |
| First page | 56 |
| Last page | 60 |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |
| Google Analytic Metrics | Metrics page |