Susceptibility of Nanophyetus salmincola cercariae to formalin, hydrogen peroxide, and seawater

Journal of Aquatic Animal Health
By: , and 

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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.

Additional publication details

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