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首页> 外文期刊>Comparative parasitology >Infestation Dynamics and Histopathology of Two Species of Freshwater Leeches (Hirudinea: Piscicolidae) on Teleost Fish from Uruguay
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Infestation Dynamics and Histopathology of Two Species of Freshwater Leeches (Hirudinea: Piscicolidae) on Teleost Fish from Uruguay

机译：乌拉圭硬骨鱼上两种淡水水ches（水rud：Piscicolidae）的侵染动力学和组织病理学

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摘要

The infestation dynamics and histopathology of the freshwater leeches (Hirudinea: Piscicolidae) Myzobdella platensis and Myzobdella uruguayensis on teleost fish from eastern Uruguay, Hoplias malabaricus (Characiformes, Erythrinidae) and Rhamdia quelen (Siluriformes, Pimelodidae), respectively, were examined over a 2-yr period Myzobdella Uruguay'ensis infested the gill filaments with 100% prevalence and a mean intensity of 12,5, There was an aggregated distribution, infestation was most intense on the first 2 gill pairs, and leeches were usually attached to the ventral gill sector The preference for internal or external gill filaments was independent of leech abundance. Hemorrhage with clot formation and fibrin deposition were observed at the attachment sites. Gill filaments also exhibited an inflammatory reaction with edema and infiltration of mononuclear leukocytes Some gill lamellae showed telangiectasic changes, Myzobdella platensis was variably prevalent over years (1987,71.4%; 1989, 37.5%) but with similar mean intensities (1987, 3.2; 1989, 3.5). Leeches were found mainly on the caudal fin rays; none was found on the dorsal fin Skin at the site of attachment exhibited complete erosion of the epidermis and a massive cellular infiltration by mononuclear cells. The epidermis close to the attachment site exhibited basal hyperplasia and spongiosis The dermis showed edema, and the presence of scarce inflammatory cells was verified.
机译：在乌拉圭东部的硬骨鱼上，对淡水水（（Hirudinea：Piscicolidae）的Myzobdella platensis和Myzobdella uruguayensis的侵染动力学和组织病理学进行了研究，分别对Hoplias malabaricus（Characiformes，Erythrinidae）和Rhamdia quelen（Siluriformes，Pimel）进行了研究。在此期间，乌拉圭Myzobdella Uruguay'ensis以100％的患病率侵染the丝，平均强度为1,2,5。有聚集分布，在前两对ill中侵扰最为严重，并且水ches通常附着在腹g区内部或外部g丝的偏好与水ech丰度无关。在附着部位观察到有凝块形成和纤维蛋白沉积的出血。丝也表现出炎症反应，并伴有水肿和单核白细胞浸润。某些g片表现出毛细血管扩张的变化，多年生扁平藻（1987,71.4％; 1989，37.5％），但平均强度相似（1987，3.2; 1989） ，3.5）。水ches主要发现在尾鳍射线上。在背鳍上未发现任何附着部位的皮肤，表皮被完全侵蚀，单核细胞大量浸润了细胞。靠近附着位点的表皮表现出基底增生和海绵状病变。真皮表现出水肿，并证实了炎性细胞稀少。

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