Efficacy of sodium percarbonate and formaldehyde bath treatments against Gyrodactylus derjavini infestations of rainbow trout

摘要

Static bath treatments with sodium percarbonate (a compound that releases hydrogen peroxide) and formaldehyde were tested for their effects on Gyrodactylus derjavini populations on rainbow trout Oncorhynchus mykiss. After 18 h of exposure to sodium percarbonate at concentrations at 80 mg/L or more, all ectoparasites were eradicated. Treatment with 40 mg/L produced a significant reduction of the parasite population. Exposure to formaldehyde at a concentration of 20 mg/L for 18 h eliminated the parasites, and treatments with 5 and 10 mg/L reduced them significantly. Our results suggest that sodium percarbonate is an alternative to formaldehyde for reducing G. derjavini populations on rainbow trout.