ARS | Publication request: Acute toxicity of peracetic acid (PAA) to Ichthyophthirius multifiliis theronts

Submitted to: Book of Abstracts Aquaculture America
Publication Type: Abstract Only
Publication Acceptance Date: December 10, 2008
Publication Date: February 16, 2009
Citation: Straus, D.L., Meinelt, T. 2009. Acute toxicity of peracetic acid (PAA) to Ichthyophthirius multifiliis theronts [abstract]. Book of Abstracts Aquaculture America. p.338.

Technical Abstract: Peracetic acid (PAA) is an antimicrobial disinfectant used in agriculture, food processing and medical facilities. It has recently been suggested as a means to control infestations of Ichthyophthirius multifiliis. The purpose of this study was to determine the acute toxicity of two products containing 4.5% and 40% PAA to I. multifiliis theronts from two geographically separate isolates. Theronts were exposed to concentrations of PAA in 96-well plates containing groundwater at 23°C. Acute toxicity was observed over a 4 h period. No significant difference in the median lethal concentration (LC50) estimates was evident between the two isolates at 4 hrs with the 4.5% PAA product (0.146 versus 0.108 mg/l PAA), while there was a statistical difference between the 4 hr LC50 estimates with the 40% PAA product (0.274 versus 0.158 mg/l PAA). These results suggest that PAA is toxic to I. multifiliis theronts at low concentrations and that one of the isolates was more resistant to this compound.