Skorobrekhova E
https://ror.org/021scha67Institute of Biological Problems of the North FEB RAS, ul. Portovaya 18, 685000Magadan, Russia.
J Helminthol. 2025 Jul 8;99:e68. doi: 10.1017/S0022149X25100461.
Data on the infection of Middendorff's eelpout, , by metacercariae of the trematodes Creplin, 1825 and Gubanov, 1953, which are causative agents of black spot disease, is provided here for the first time for Taui Bay, Sea of Okhotsk. The prevalence of infection of fish by larvae of reached 79%, while the intensity of infection varied from one to 278 individuals (with an average of 53). The prevalence of infection by was lower (40%), with an intensity from one to 22 larvae (on average, eight). Metacercariae of both trematode species were surrounded by two envelopes: an outer, connective tissue capsule formed by the host's cells, and an inner cyst formed by the parasite. The examined metacercariae were found in all regions of the fish's body (head, trunk, and fins), with approximately equal numbers of individuals of both species found in tissues of the head and trunk regions. Metacercariae of were localised in the fishes' muscles, not only immediately under the skin but also in deeper layers. The capsules formed around metacercariae of both trematode species were dominated by fibroblasts and collagen fibres and did not show pronounced signs of inflammation. Studying the distribution of black spot disease and its effects on fish is crucial for understanding disease patterns in relation to fish population dynamics. It may also inform the development of effective anthelmintic treatments for use in aquaculture farms.
本文首次提供了鄂霍次克海塔伊湾关于远东杜父鱼被吸虫（1825年的克雷普林吸虫和1953年的古巴诺夫吸虫）尾蚴感染的数据，这两种吸虫是黑斑病的病原体。远东杜父鱼被克雷普林吸虫幼虫感染的患病率达到79%，而感染强度从1个到278个个体不等（平均为53个）。被古巴诺夫吸虫感染的患病率较低（40%），感染强度从1个到22个幼虫不等（平均为8个）。两种吸虫的尾蚴都被两层包膜包围：外层是由宿主细胞形成的结缔组织囊，内层是由寄生虫形成的囊肿。在所检查的尾蚴中，在鱼体的所有部位（头部、躯干和鳍）均有发现，在头部和躯干区域的组织中发现的两种吸虫个体数量大致相等。克雷普林吸虫的尾蚴不仅位于鱼体皮肤下方的肌肉中，也位于更深层的肌肉中。两种吸虫尾蚴周围形成的囊以成纤维细胞和胶原纤维为主，未表现出明显的炎症迹象。研究黑斑病的分布及其对鱼类的影响对于理解与鱼类种群动态相关的疾病模式至关重要。这也可能为水产养殖场有效驱虫治疗方法的开发提供参考。
