Mo Tor Atle, Hansen Haakon, Hytterød Sigurd
Norwegian Institute for Nature Research, Oslo, Norway.
Norwegian Veterinary Institute, Ås, Norway.
J Fish Dis. 2023 Apr;46(4):395-403. doi: 10.1111/jfd.13752. Epub 2023 Jan 4.
Gyrodactylus spp. (Monogenea) were found on 16.9% (233 out of 1376) Arctic char, Salvelinus alpinus (L.), sampled from September 2010 to October 2011 in the Fustvatnet lake, Northern Norway. Two species were identified: G. salaris Malmberg, 1957, and G. salmonis Yin & Sproston, 1948. Gyrodactylus salaris was only found on Arctic char larger than 28 cm and only in samples obtained in the autumn (September and October). Gyrodactylus salmonis was found on Arctic char of all sizes (11-47 cm) and throughout the year, with a small peak in abundance in the late autumn (November). Gyrodactylus salaris was found to prefer the tail and dorsal fin. Based on the results, we recommend that surveys of Arctic char for the presence of G. salaris are based on the examination of the fins of large fish sampled during the spawning season (autumn).
2010年9月至2011年10月期间，在挪威北部的富斯特瓦特内湖对1376条北极红点鲑（Salvelinus alpinus (L.)）进行采样，发现16.9%（233条）的鱼感染了三代虫属（Gyrodactylus spp.，单殖吸虫纲）。鉴定出两个物种：1957年的马氏三代虫（G. salaris Malmberg）和1948年的鲑三代虫（G. salmonis Yin & Sproston）。马氏三代虫仅在体长超过28厘米的北极红点鲑身上发现，且仅在秋季（9月和10月）采集的样本中出现。鲑三代虫在各种大小（11 - 47厘米）的北极红点鲑身上全年都有发现，在深秋（11月）数量有一个小高峰。发现马氏三代虫更喜欢寄生在鱼尾和背鳍上。根据这些结果，我们建议对北极红点鲑进行马氏三代虫调查时，应在产卵季节（秋季）对大鱼的鱼鳍进行检查。
