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Malacosporean myxozoans exploit a diversity of fish hosts

机译：malacosporean myxozoans利用多样性的鱼宿主

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Myxozoans are widespread and common endoparasites of fish with complex life cycles, infecting vertebrate and invertebrate hosts. There are two classes: Myxosporea and Malacosporea. To date about 2500 myxosporean species have been described. By comparison, there are only five described malacosporean species. Malacosporean development in the invertebrate hosts (freshwater bryozoans) has been relatively well studied but is poorly known in fish hosts. Our aim was to investigate the presence and development of malacosporeans infecting a diversity of fish from Brazil, Europe and the USA. We examined kidney from 256 fish belonging variously to the Salmonidae, Cyprinidae, Nemacheilidae, Esocidae, Percidae, Polyodontidae, Serrasalmidae, Cichlidae and Pimelodidae. Malacosporean infections were detected and identified by polymerase chain reaction and small subunit ribosomal DNA sequencing, and the presence of sporogonic stages was evaluated by ultrastructural examination. We found five malacosporean infections in populations of seven European fish species (brown trout, rainbow trout, white fish, dace, roach, gudgeon and stone loach). Ultrastructural analyses revealed sporogonic stages in kidney tubules of three fish species (brown trout, roach and stone loach), providing evidence that fish belonging to at least three families are true hosts. These results expand the range of fish hosts exploited by malacosporeans to complete their life cycle.
机译：Myxozoans是具有复杂生命周期的鱼的普遍和常见的内甲酸，感染脊椎动物和无脊椎动物。有两类：myxosporea和malacosporea。迄今为止已经描述了大约2500个Myxoseporem物种。相比之下，只有五种Malacoseporean物种。在无脊椎动物宿主（淡水荆棘）中的Malacoseporean发育一直在研究，但在鱼宿主中闻名。我们的目标是调查感染巴西，欧洲和美国的鱼类多样性的Malacoseporean的存在和发展。我们检查了256条鱼的肾，属于鲑鱼，塞浦路尼亚，尼治疗，牛蒡，Polodontidae，Serrasalmidae，Cichlidae和Pimelodidae。通过聚合酶链反应和小亚基核糖体DNA测序检测并鉴定Malacoseporean感​​染，通过超微结构检查评估孢子激素阶段的存在。我们在七种欧洲鱼类种群中发现了五种Malacoseperean感​​染（棕色鳟鱼，彩虹鳟鱼，白鱼，雏菊，蟑螂，欺骗和石材泥鳅）。超微结构分析揭示了三种鱼类（棕色鳟鱼，蟑螂和石材泥鳅）肾小管中的孢子激素阶段，提供了属于至少三个家庭的鱼是真正的宿主。这些结果扩展了Malacoseporeans利用的鱼类主体的范围来完成他们的生命周期。

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