Mullin Brian R, Reyda Florian B
Biology Department and Biological Field Station, State University of New York College at Oneonta, Oneonta, New York 13820.
J Parasitol. 2020 Feb;106(1):198-200.
(Dana, 1853) (Subclass Copepoda: Family Lernaeopodidae) is known to parasitize salmonids of the genus including (rainbow trout), (chinook salmon), and (coho salmon). These 3 salmonids have been introduced to the Great Lakes intermittently since the mid-1800s. As we demonstrate here, the introduction of these salmonids to the Great Lakes was followed, at some point, by the introduction of their parasitic gill copepod, . Given anecdotal accounts of in introduced salmonids in Lake Ontario since 2012, we chose to conduct a survey to formally document the occurrence of this introduced species. Our survey took place during spring, summer, and fall of 2018 and during spring of 2019 at the south-eastern side of Lake Ontario. Prevalence of was 69, with a mean intensity of 2.7 in 61 rainbow trout examined in 2018. In 2019, prevalence of was 71, with a mean intensity of 3.6 in 59 rainbow trout examined. The prevalence of was 39, with a mean intensity of 1.6 in 223 chinook salmon examined in 2018. No specimens of were found in the 100 coho salmon examined in 2018. The prevalence of in rainbow trout is of great concern considering that it is double that found in rainbow trout in the native range (69 [in 2018] and 71 [in 2019] vs. 35). This is the first formal documentation of the invasion of in Lake Ontario. Future fisheries management decisions in Lake Ontario and its tributaries should take into account these data.
（达纳，1853年）（桡足亚纲：锚头鳋科）已知寄生于包括虹鳟（虹鳟）、奇努克鲑（大鳞大麻哈鱼）和银大麻哈鱼（银鲑）在内的大麻哈鱼属鲑科鱼类。自19世纪中叶以来，这3种鲑科鱼类被陆续引入五大湖。正如我们在此所证明的，这些鲑科鱼类被引入五大湖后，在某个时间点，其寄生性鳃桡足类动物也随之被引入。鉴于自2012年以来安大略湖引进的鲑科鱼类中有关于该桡足类动物的传闻，我们选择进行一项调查，以正式记录这种引进物种的出现情况。我们的调查于2018年的春季、夏季和秋季以及2019年春季在安大略湖的东南侧进行。2018年检查的61条虹鳟中，该桡足类动物的感染率为69%，平均感染强度为2.7。2019年，该桡足类动物的感染率为71%，在检查的59条虹鳟中平均感染强度为3.6。2018年检查的223条奇努克鲑中，该桡足类动物的感染率为39%，平均感染强度为1.6。在2018年检查的100条银大麻哈鱼中未发现该桡足类动物的样本。考虑到虹鳟中该桡足类动物的感染率是其原生范围内虹鳟感染率的两倍（2018年为69%，2019年为71%，而原生范围为35%），这一情况令人高度关注。这是该桡足类动物入侵安大略湖的首次正式记录。安大略湖及其支流未来的渔业管理决策应考虑这些数据。
