Sohn Woon-Mok, Na Byoung-Kuk, Jung Soo Gun, Kim Koo Hwan
Department of Parasitology and Tropical Medicine, and Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju 52727, Korea.
Korea Federation for Environmental Movements in Daegu, Daegu 41259, Korea.
Korean J Parasitol. 2016 Jun;54(3):363-8. doi: 10.3347/kjp.2016.54.3.363. Epub 2016 Jun 30.
We describe here the mass death of predatory carp, Chanodichthys erythropterus, in Korea induced by plerocercoid larvae of Ligula intestinalis as a result of host manipulation. The carcasses of fish with ligulid larvae were first found in the river-edge areas of Chilgok-bo in Nakdong-gang (River), Korea at early February 2016. This ecological phenomena also occurred in the adjacent areas of 3 dams of Nakdong-gang, i.e., Gangjeong-bo, Dalseong-bo, and Hapcheon-Changnyeong-bo. Total 1,173 fish carcasses were collected from the 4 regions. To examine the cause of death, we captured 10 wondering carp in the river-edge areas of Hapcheon-Changnyeong-bo with a landing net. They were 24.0-28.5 cm in length and 147-257 g in weight, and had 2-11 plerocercoid larvae in the abdominal cavity. Their digestive organs were slender and empty, and reproductive organs were not observed at all. The plerocercoid larvae occupied almost all spaces of the abdominal cavity under the air bladders. The proportion of larvae per fish was 14.6-32.1% of body weight. The larvae were ivory-white, 21.5-63.0 cm long, and 6.0-13.8 g in weight. We suggest that the preference for the river-edge in infected fish during winter is a modified behavioral response by host manipulation of the tapeworm larvae. The life cycle of this tapeworm seems to be successfully continued as the infected fish can be easily eaten by avian definitive hosts.
我们在此描述韩国发生的由阔节裂头绦虫的裂头蚴幼虫通过宿主操控导致的赤眼梭鲈大量死亡事件。2016年2月初，在韩国洛东江奇尔谷浦的河边区域首次发现带有裂头蚴幼虫的鱼类尸体。这种生态现象也发生在洛东江三座大坝的相邻区域，即江亭浦、达城浦和河川 - 昌宁浦。从这四个区域共收集到1173具鱼尸。为了查明死因，我们用抄网在河川 - 昌宁浦的河边区域捕获了10条游动的梭鲈。它们体长24.0 - 28.5厘米，体重147 - 257克，腹腔内有2 - 11条裂头蚴幼虫。它们的消化器官细长且空无一物，根本未观察到生殖器官。裂头蚴幼虫占据了气囊下方腹腔的几乎所有空间。每条鱼体内幼虫的比例为体重的14.6 - 32.1%。幼虫呈乳白色，长21.5 - 63.0厘米，体重6.0 - 13.8克。我们认为，受感染的鱼在冬季对河边区域的偏好是绦虫幼虫对宿主操控所产生的一种行为改变反应。由于受感染的鱼很容易被鸟类终宿主吃掉，这种绦虫的生命周期似乎得以成功延续。
