Vuić Nera, Turković Čakalić Ivana, Vlaičević Barbara, Stojković Piperac Milica, Čerba Dubravka
Department of Biology, Josip Juraj Strossmayer University of Osijek, Cara Hadrijana 8/A, HR-31000 Osijek, Croatia.
Department of Biology and Ecology, Faculty of Science and Mathematics, University of Niš, Višegradska 33, 18000 Niš, Serbia.
Pathogens. 2022 May 21;11(5):600. doi: 10.3390/pathogens11050600.
Contracaecum larvae are geographically widely distributed, utilizing many animal species as hosts; and fish represent an important paratenic host in their life cycle. Their presence in Prussian carp (Carassius gibelio) was studied in Lake Sakadaš (Croatia) in 2017 and 2018. Two gill nets of different sizes submerged during a 12-h period were used to collect the fish. Contracaecum larvae were recorded in the stomach, slightly coiled or elongated on the intestine serosa or encapsulated in a gut wall of 20 individuals. The effect of Contracaecum sp. on the health of their host was determined by estimating the effect of the parasites’ presence, number, and biomass on fish length, weight, and the Fulton’s condition factor (CF). Infected fish showed negative (b < 3; p < 0.05) and uninfected fish positive allometric growth (b > 3; p < 0.05). Fish weight and CF in infected individuals were significantly low in comparison to the uninfected ones (Mann−Whitney U test: U = 1078.00, U = 423.50, respectively; p < 0.004). These results emphasize the importance of evaluating parasitic nematode presence in economically important fish species. Even more, if this endoparasite has a detectable negative impact on a resilient species such as the Prussian carp, it is important to monitor its occurrence in other fish species.
对盲囊线虫幼虫在地理上分布广泛，寄生于多种动物；鱼类是其生命周期中的重要转续宿主。2017年和2018年在克罗地亚的萨卡达什湖对其在银鲫（Carassius gibelio）体内的情况进行了研究。使用两张不同尺寸的刺网在12小时内进行水下作业来收集鱼类。在20条鱼的胃中发现了对盲囊线虫幼虫，它们在肠浆膜上轻微盘绕或伸长，或被包囊在肠壁中。通过评估寄生虫的存在、数量和生物量对鱼的体长、体重和富尔顿条件因子（CF）的影响，来确定对盲囊线虫对宿主健康的影响。受感染的鱼呈现负异速生长（b < 3；p < 0.05），未受感染的鱼呈现正异速生长（b > 3；p < 0.05）。与未受感染的鱼相比，受感染个体的鱼体重和CF显著较低（曼-惠特尼U检验：U分别为1078.00和423.50；p < 0.004）。这些结果强调了评估经济上重要的鱼类物种中寄生线虫存在情况的重要性。更重要的是，如果这种体内寄生虫对像银鲫这样有适应能力的物种有可检测到的负面影响，那么监测其在其他鱼类物种中的发生情况就很重要。
