Bui Samantha, Madaro Angelico, Nilsson Jonatan, Fjelldal Per Gunnar, Iversen Martin Haugmo, Brinchman Monica Fengsrud, Venås Birger, Schrøder Merete Bjørgan, Stien Lars Helge
Animal Welfare research group, Institute of Marine Research, Matre Research Station N-5984 Matredal, Norway.
Reproduction and Developmental Biology, Institute of Marine Research, Matre Research Station N-5984 Matredal, Norway.
Vet Anim Sci. 2022 Jul 13;17:100265. doi: 10.1016/j.vas.2022.100265. eCollection 2022 Sep.
Thermal treatment is a controversial method to control sea lice in the Atlantic salmon farming industry. This study aimed to complement the growing evidence base to document the impact of thermal treatments on salmon welfare, behaviour, physiology and health. Here, fish were treated two times (four weeks apart) for 30 s in either 27, 30, or 33 °C warm water, and parameters were compared to a procedural control (exposed to their holding temperature of 14 °C) or a negative control (where no treatments were applied). The fish had a clear behavioural response to the warm water, despite low difference between treatment and holding temperature (Δt = 13, 16 or 19 °C). Eye damages were more prevalent in the warm water treated groups than in the controls. Little difference was recorded between treatment groups in their growth and condition factor, blood plasma values, organ health, and long-term coping ability. There was, however, a significant increase in mortality as a function of temperature after the first treatment (14 °C: 6.5%, 27 °C: 5.3%, 30 °C: 12.4% and 33 °C: 18.9% mortality). The first treatment was performed only two weeks after the fish had been tagged and moved into the experimental holding tanks, while the fish had been allowed to recover for four weeks without any handling before the second treatment. The group of fish that were not subjected to any treatments (the negative control) had no mortality throughout the entire experimental period.
热处理是大西洋鲑鱼养殖行业中一种有争议的控制海虱的方法。本研究旨在补充越来越多的证据，以记录热处理对鲑鱼福利、行为、生理和健康的影响。在此，将鱼在27、30或33°C的温水中处理两次（间隔四周），每次处理30秒，并将各项参数与程序对照组（暴露于14°C的养殖水温）或阴性对照组（未进行任何处理）进行比较。尽管处理温度与养殖水温之间的差异较小（Δt = 13、16或19°C），但鱼对温水仍有明显的行为反应。与对照组相比，温水处理组的眼部损伤更为普遍。各处理组在生长、肥满度、血浆值、器官健康和长期应对能力方面差异不大。然而，第一次处理后，死亡率随温度升高显著增加（14°C：6.5%，27°C：5.3%，30°C：12.4%，33°C：18.9%死亡率）。第一次处理是在鱼被标记并转移到实验养殖水箱仅两周后进行的，而在第二次处理前，鱼被允许在未经任何处理的情况下恢复四周。未接受任何处理的鱼组（阴性对照组）在整个实验期间均无死亡。
