Aquatic Contaminants Research Division, Water Science and Technology Directorate, Science and Technology Branch, Environment and Climate Change Canada, St. Lawrence Centre, 105 McGill Street, 7th floor, Montreal, Quebec H2Y 2E7, Canada.
J Parasitol. 2022 Jul 1;108(4):337-342. doi: 10.1645/22-35.
The round goby (Neogobius melanostomus) is an invasive species that has become one of the most abundant fish in the St. Lawrence River, Quebec, Canada over the past 15 yr. Since its introduction, the round goby has acquired a number of native parasites, yet little is known about the dynamics of parasite recruitment. To examine this question, young-of-the-year and juvenile round gobies were collected monthly from 2 localities in the river (Îles de la Paix, Île Dorval) from June through November 2012. At Îles de la Paix, round gobies (n = 180) were infected with 3 species of parasites, all larval stages (Diplostomum spp., Tylodelphys scheuringi, Neoechinorhynchus tenellus). Prevalence of the digenean Diplostomum spp. varied from 3.3 to 13.3%, and mean abundance from 0.03 to 0.53 from June through September, with a maximum in August. The digenean T. scheuringi was seen only in August, at a prevalence of 10.0% and a mean abundance of 0.53. The acanthocephalan N. tenellus was observed in June, August, and September, prevalence ranging from 3.3 to 10.0% and mean abundance from 0.03 to 0.27. Maximum infection for all 3 species occurred in August. All infected fish were ≥44 mm in total length (TL). Fish infected with more than 1 parasite species were >60 mm TL. No round goby (n = 178) was infected at Île Dorval. This study demonstrated that the invasive round goby starts to acquire parasite infections in the St. Lawrence River in the first year of life and may contribute to the transmission of some parasites within this ecosystem.
圆鳍鱼（Neogobius melanostomus）是一种入侵物种，在过去 15 年中已成为加拿大魁北克圣劳伦斯河（St. Lawrence River）中最丰富的鱼类之一。自引入以来，圆鳍鱼已获得了许多本地寄生虫，但对寄生虫招募的动态知之甚少。为了研究这个问题，我们于 2012 年 6 月至 11 月期间每月从河流的两个地点（Îles de la Paix，Île Dorval）采集幼年和幼鱼的圆鳍鱼。在Îles de la Paix，有 180 条圆鳍鱼感染了 3 种寄生虫，均为幼虫阶段（双鳞盘吸虫属，Tylodelphys scheuringi，新棘头虫属）。双鳞盘吸虫属的吸虫感染率从 3.3%到 13.3%不等，6 月至 9 月的平均丰度从 0.03 到 0.53，8 月达到最高。双鳞盘吸虫属只在 8 月发现，感染率为 10.0%，平均丰度为 0.53。棘头虫属的 N. tenellus 仅在 6 月、8 月和 9 月观察到，感染率为 3.3%至 10.0%，平均丰度为 0.03 至 0.27。所有 3 种寄生虫的最大感染发生在 8 月。所有感染的鱼的全长（TL）均≥44mm。感染 1 种以上寄生虫的鱼体长>60mm TL。在Île Dorval 没有发现感染的圆鳍鱼（n = 178）。本研究表明，入侵的圆鳍鱼在其生命的第一年开始获得寄生虫感染，并可能有助于该生态系统内某些寄生虫的传播。
