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Evaluation of low temperature and salinity as a treatment of Atlantic salmon against amoebic gill disease

Hudson, J, Adams, M ORCID: 0000-0002-5737-5474, Jantawongsri, K, Dempster, T and Nowak, BF ORCID: 0000-0002-0347-643X 2022 , 'Evaluation of low temperature and salinity as a treatment of Atlantic salmon against amoebic gill disease' , Microorganisms, vol. 10, no. 2 , pp. 1-14 , doi:

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Amoebic gill disease (AGD) is a significant health issue for Atlantic salmon farmed in a marine environment. While the disease is currently managed using freshwater or hydrogen peroxide baths, there is a need to develop other treatments. The aims of this study were to examine the effect of salinity (0 ppt and 35 ppt) and temperature (3 °C and 15 °C) on attachment and survival of Neoparamoeba perurans in vitro over short exposure times (15 min and 2 h) and to assess the efficacy of reduced temperature (3 °C) as treatment for Atlantic salmon affected by AGD. In vitro freshwater 3 °C was at least as effective as freshwater 15 °C and the attachment was significantly lower after 2 h in freshwater 3 °C than freshwater 15 °C. In vivo there was no difference between the fish treated with freshwater 15 °C for 2 h or freshwater 3 °C. This study showed that despite exposure to low temperature reducing attachment of N. perurans to their substrate in vitro, 15 min cold-water bath treatment was not more effective at reducing AGD in Atlantic salmon than current commercial 2 h freshwater bath.

Item Type: Article
Authors/Creators:Hudson, J and Adams, M and Jantawongsri, K and Dempster, T and Nowak, BF
Keywords: mariculture, salmon, Neoparamoeba perurans
Journal or Publication Title: Microorganisms
Publisher: MDPIAG
ISSN: 2076-2607
DOI / ID Number:
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© 2022. The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License ( The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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