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

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...

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Bibliographic Details
Published in:Microorganisms
Main Authors: Hudson, J, Adams, M, Jantawongsri, K, Dempster, T, Nowak, BF
Format: Article in Journal/Newspaper
Language:English
Published: MDPIAG 2022
Subjects:
Agricultural
Veterinary and Food Sciences
Fisheries sciences
Fish pests and diseases
Atlantic salmon
Online Access:https://doi.org/10.3390/microorganisms10020202
http://ecite.utas.edu.au/148714
Description
Summary: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.

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