This short communication investigated in vitro differences between commercial disinfectants types (n = 36), doses of application, and time of action in the elimination of Piscirickettsia salmonis, the most important bacterium affecting farmed salmon in Chile. Seven different treatments were examined, including active and inactive chlorine dioxides, glutaraldehyde, hypochlorite disinfectants and detergents, peracetic acid, peroxides and other miscellaneous methods A 3 replicate set of each of the sample groups was stored at 20 °C and 95% relative humidity and retested after 1, 5 and 30 min with varying doses (low, recommended and high doses). Multiple comparison tests were performed for the mean log CFU/ml among different disinfectant types, dose (ppm) and time of exposure (minutes) on the reduction of P. salmonis. Overall, disinfection using peracetic acid, peroxides, and both active and inactive chlorine dioxides caused significantly higher reduction of >7.5 log CFU/ml in samples, compared to other tested sanitizers. The lowest reduction was obtained after disinfection with hypochlorite detergents. As expected, as doses and time of action increase, there was a significant reduction of the overall counts of P. salmonis. However, at lowest doses, only use of paracetic acids resulted in zero counts. Implementation of effective protocols, making use of adequate disinfectants, may enhance biosecurity, and ultimately, mitigate the impact of P. salmonis in farmed salmon.
Bibliographical noteFunding Information:
This research was funded by CORFO-INNOVA project No 12BPC2-13531 and projects funded by the Chilean Fund for Scientific and Technological Development (FONDECYT) Project 3140235 and the Minnesota’s Discovery, Research and InnoVation Economy (MNDRIVE). We thank industry representatives that were willing to participate in this project. The Ministerio de Educación of Spain is acknowledged by the FPU/MEC doctorate fellowship for Ana Muniesa.
© 2018 Elsevier B.V.
- Peracetic acid
- Piscirickettsia salmonis
- Salmon farming