ABSTRACT The Van fish are a cyprinid species endemic to Turkey’s largest soda lake, Lake Van, and have great economic value because they are a food source. Once a year, the fish take part in reproductive migration to the fresh waters flowing into the lake. The fish migrate from an extreme environment with high salinity (2.2%) and high pH (9.8). These fish are unable to reproduce in this alkaline environment and must migrate to fresh water during their breeding season. The aim of the present study is to report the presence of the myxosporean parasites on the gills and the pathological changes. Changes in gill histopathology, mucocytes, mitochondria-rich cells, expression of Heat Shock Protein 70 (Hsp70), and ATPase (NKA) were observed in the gill tissue. As a result of the histopathological changes in gills, infected fish had abundant plasmodia with different sizes. Plasmodia were found on gill filaments inside white ovoid-shaped structures. It was observed that plasmodia were contained on the primary filament which changed the histological structure of the gill tissue to a large extent. It was determined that the density and size of mucocytes in the infected areas of the gill tissue increased, whereas the number of mitochondria-rich cells decreased. Hsp70, an indicator of stress, was not different between normal and infected fish.

中文翻译：

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感染粘孢子虫寄生虫的凡鱼 (Alburnus tarichi Güldenstädt, 1814) 鳃的组织病理学和免疫组织化学

摘要 凡鱼是土耳其最大的苏打湖凡湖特有的鲤科鱼类，因其是食物来源而具有巨大的经济价值。每年一次，这些鱼参与繁殖迁移到流入湖中的淡水中。鱼从高盐度 (2.2%) 和高 pH (9.8) 的极端环境中迁移。这些鱼无法在这种碱性环境中繁殖，必须在繁殖季节迁移到淡水中。本研究的目的是报告鳃上粘孢子虫寄生虫的存在和病理变化。在鳃组织中观察到鳃组织病理学、粘细胞、富含线粒体的细胞、热休克蛋白 70 (Hsp70) 和 ATPase (NKA) 的表达的变化。由于鳃的组织病理学变化，受感染的鱼有丰富的不同大小的疟原虫。在白色卵形结构内的鳃丝上发现了疟原虫。观察到疟原虫包含在初级丝上，这在很大程度上改变了鳃组织的组织结构。结果表明，鳃组织感染区域的粘液细胞密度和大小增加，而富含线粒体的细胞数量减少。Hsp70 是一种压力指标，在正常鱼和受感染鱼之间没有差异。结果表明，鳃组织感染区域的粘液细胞密度和大小增加，而富含线粒体的细胞数量减少。Hsp70 是一种压力指标，在正常鱼和受感染鱼之间没有差异。结果表明，鳃组织感染区域的粘液细胞密度和大小增加，而富含线粒体的细胞数量减少。Hsp70 是一种压力指标，在正常鱼和受感染鱼之间没有差异。