Norwegian College of Fishery Science, University of Tromsø, N-9037 Norway.
J Fish Biol. 2009 May;74(7):1476-86. doi: 10.1111/j.1095-8649.2009.02215.x.
There has been an increased focus on Salvelinus alpinus as a potential long-term host to Gyrodactylus salaris and, here, both susceptibility to G. salaris and ability to sustain a parasite population seasonally, was tested using fry and parr of S. alpinus from the River Skibotnelva, northern Norway. Fry were highly susceptible. Gyrodactylus salaris survived on allopatric S. alpinus parr during the 5 month-long winter when water temperatures were c. 1 degrees C. Salvelinus alpinus fry also maintained a pulse of G. salaris infection for over 155 days from early May until autumn. Gyrodactylus salaris are thus able to reproduce and survive on S. alpinus for long periods and at low water temperatures. In spring, newly hatched fry of S. alpinus may serve as an important host to maintain a G. salaris metapopulation within a river system. The results suggest that S. alpinus are adequate long-term hosts of G. salaris independent of the presence of the co-occurring highly susceptible S. salar.
人们越来越关注北极红点鲑（Salvelinus alpinus）作为鲑鱼虱（Gyrodactylus salaris）的潜在长期宿主，在这里，使用来自挪威北部斯凯博特内尔瓦河的北极红点鲑幼鱼和幼鲑来测试其对鲑鱼虱的易感性和季节性维持寄生虫种群的能力。幼鱼非常易感。当水温约为 1 摄氏度时，鲑鱼虱在异地的北极红点鲑幼鲑上存活了长达 5 个月的冬季。从 5 月初到秋季，北极红点鲑幼鱼也保持了一段时间的鲑鱼虱感染脉冲，持续时间超过 155 天。因此，鲑鱼虱能够在北极红点鲑上长时间繁殖和生存，并且在低温下也能生存。在春季，刚孵化的北极红点鲑幼鱼可能是维持河流系统中鲑鱼虱局域种群的重要宿主。研究结果表明，无论是否存在高度易感的大西洋鲑（Salmo salar），北极红点鲑都是鲑鱼虱的合适长期宿主。
