Hudson Jemma, Adams Mark, Jantawongsri Khattapan, Dempster Tim, Nowak Barbara F
Institute for Marine and Antarctic Studies (IMAS), University of Tasmania, Launceston, TAS 7250, Australia.
Sustainable Aquaculture Laboratory-Temperate and Tropical (SALTT), School of BioSciences, Faculty of Science, University of Melbourne, Melbourne, VIC 3010, Australia.
Microorganisms. 2022 Jan 18;10(2):202. doi: 10.3390/microorganisms10020202.
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 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 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.
阿米巴鳃病（AGD）是养殖于海洋环境中的大西洋鲑面临的一个重大健康问题。虽然目前该病通过淡水浴或过氧化氢浴进行控制，但仍需要开发其他治疗方法。本研究的目的是在短暴露时间（15分钟和2小时）内，研究盐度（0 ppt和35 ppt）和温度（3℃和15℃）对体外寄生虫附着和存活的影响，并评估降低温度（3℃）作为受AGD影响的大西洋鲑治疗方法的疗效。体外实验中，3℃淡水至少与15℃淡水效果相同，且在3℃淡水中2小时后的附着率显著低于15℃淡水。体内实验中，用15℃淡水处理2小时的鱼和用3℃淡水处理的鱼之间没有差异。本研究表明，尽管低温在体外可降低寄生虫对其底物的附着，但15分钟冷水浴治疗在降低大西洋鲑AGD方面并不比当前商业用的2小时淡水浴更有效。
