Muzzall Patrick M, Eggold Bradley T, Fahey Robert J
Department of Zoology, Michigan State University, East Lansing, Michigan 48824, USA.
J Parasitol. 2006 Apr;92(2):408-10. doi: 10.1645/GE-3529RN.1.
One hundred extended growth walleye fingerlings, Sander vitreus (Percidae), collected on 6 October 2004, from 1 rearing pond at the Lake Mills State Fish Hatchery in Lake Mills, Wisconsin, were examined for parasites. Diplostomum sp. (Trematoda: Diplostomatidae), Contracaecum sp. (Nematoda: Anisakidae), Bothriocephalus cuspidatus (Cestoda: Bothriocephalidae), and Proteocephalus sp. (Cestoda: Proteocephalidae) were the only parasites found. The first 3 species occurred as larval stages. Diplostomum sp. and Contracaecum sp. had similar prevalences, mean intensities, and mean abundances (72%, 2.2, and 1.6 and 71%, 2.1, 1.5, respectively) in walleye fingerlings. A headlamp technique used by the Wisconsin Department of Natural Resources personnel generated a prevalence of Diplostomum sp. in the lens that overestimated the prevalence of Diplostomum sp. found in a random subsample of 100 fingerlings examined with a microscope. Proteocephalus sp. and B. cuspidatus infected 14 and 12 fingerlings, respectively.
2004年10月6日，从威斯康星州米尔斯湖的米尔斯湖州立鱼类孵化场的1个养殖池塘中采集了100尾大眼狮鲈（Sander vitreus，鲈科）的幼鱼，对其进行寄生虫检查。仅发现了双穴吸虫属（吸虫纲：双穴科）、对盲囊线虫属（线虫纲：异尖科）、尖头双槽绦虫（绦虫纲：双槽科）和前殖吸虫属（绦虫纲：前殖科）的寄生虫。前3种以幼虫阶段出现。双穴吸虫属和对盲囊线虫属在大眼狮鲈幼鱼中的感染率、平均感染强度和平均丰度相似（分别为72%、2.2和1.6以及71%、2.1、1.5）。威斯康星州自然资源部工作人员使用的头戴式照明技术得出的双穴吸虫属在晶状体中的感染率高估了在随机抽取的100尾幼鱼的子样本中通过显微镜检查发现的双穴吸虫属的感染率。前殖吸虫属和尖头双槽绦虫分别感染了14尾和12尾幼鱼。
