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首页> 外文期刊>Marine biology >In vitro reproduction of the turbellarian Urastoma cyprinae isolated from Mytilus galloprovincialis
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In vitro reproduction of the turbellarian Urastoma cyprinae isolated from Mytilus galloprovincialis

机译：没食子菌Mytilus galloprovincialis分离出的turberarian cyprinae的体外繁殖

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Urastoma cyprinae is a species infecting the gills of several marine bivalves. Although there is some literature on this turbellarian, its life cycle remains unknown. In our work we have demonstrated that reproduction of U. cyprinae can be completed out of its host. More than 50% of turbellarians isolated from mussels (Mytilus galloprovincialis) secreted and cemented a cocoon to the well bottom during the first 72 h of incubation in seawater (34 per thousand salinity) at 14℃. Oviposition started at days 1-18 (average 4.8 days) and occurred in most cases inside the protective cocoon. Each Urastoma laid an average of 2.9 egg capsules (range 1-10) and 3.9 embryos were developed inside each egg capsule (range 1-11). Hatching started at days 20-43 (average 24 days). An average of 12.8 juvenile forms (range 1-64) escaped from the cocoon after hatching. The free-swimming juveniles showed a positive phototactic response and survived about a month after hatching. On the basis of our results, we propose a life cycle for U. cyprinae involving a sexual maturation parasitic period in the bivalve gills and a reproduction period including cocoon secretion, egg laying, and hatching that is entirely completed in the external environment.
机译：塞浦路斯urastoma cyprinae是一种感染数只海洋双壳类the的物种。尽管有一些关于这种动荡分子的文献，但其生命周期仍然未知。在我们的工作中，我们证明了cyprinae的繁殖可以在宿主之外完成。从贻贝（Mytilus galloprovincialis）分离出的Turbularian中，有超过50％在14℃的海水中孵化后的头72小时（每千盐度为34）分泌并固结了茧到井底。排卵开始于第1-18天（平均4.8天），并且在大多数情况下都发生在保护性茧内。每个Urastoma平均产卵2.9个卵囊（范围1-10），每个卵囊内部发育3.9个胚胎（范围1-11）。孵化开始于第20-43天（平均24天）。孵化后，平均有12.8个幼体（范围为1-64）从茧中逸出。自由游泳的幼虫表现出积极的光战术反应，并在孵化后约一个月存活。根据我们的研究结果，我们提出了一种cyprinae的生命周期，其中涉及双壳g的性成熟寄生期，以及包括茧分泌，产卵和孵化的繁殖期，该阶段在外部环境中完全完成。

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