Life cycle of the ectoparasite Tachaea chinensis (Isopoda: Corallanidae) on the freshwater shrimp Palaemonetes sinensis (Decapoda: Palaemonidae)
Life cycle of the ectoparasite Tachaea chinensis (Isopoda: Corallanidae) on the freshwater shrimp Palaemonetes sinensis (Decapoda: Palaemonidae)
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DOI：
10.3354/dao03579
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发表时间：
2021-01-01
影响因子：
1.4
通讯作者：
Li, Yingdong
中科院分区：
文献类型：
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作者：
Xu, Weibin;Li, Xin;Li, Yingdong
在这项研究中，我们详细描述了Tachaeachinensis（等足目：珊瑚科）的生活史，鳃外寄生的等足类，寄生在中国的淡水虾Palaemonetes sinensis在中国。我们获得了14只产卵T.中华绒螯蟹雌蟹（体长8.22- 11.92mm），观察了胚胎在其育袋（有袋）内经过5个连续发育阶段的发育过程。雌性有袋动物体内的卵子或曼卡（幼虫后的幼虫）数量范围为31至86个，平均+/- SD为61.25 +/- 16.16个卵子。雌性T.中国人是semelparous，即个体死亡后释放的mancae从有袋。释放的曼卡是非寄生性的，并立即感染宿主虾。然而，只有少数的曼卡成功地与宿主建立了联系，因此可以假设其余的曼卡都是被虾捕食的。附T。中华绒螯蟹以寄主血淋巴为食，在寄主死亡后，这些等足类动物通常会寻找新的寄主。我们还发现T.中国对虾表现出宿主偏好：大多数的曼卡附着在中华对虾而不是新米虾或日本沼虾。这项研究提供了宝贵的经验数据，将支持未来的研究，预防和控制寄生等足类动物感染。
In this study, we describe in detail the life cycle of Tachaea chinensis (Isopoda: Corallanidae), a branchial ectoparasitic isopod that infests the freshwater shrimp Palaemonetes sinensis in China. We obtained 14 ovigerous T. chinensis females (8.22-11.92 mm in length) and observed the development of embryos through 5 sequential ontogenetic stages within the brood pouches (marsupium) of these females. The number of eggs or mancae (post-larval juveniles) held in the female marsupium ranged from 31 to 86, with a mean +/- SD of 61.25 +/- 16.16 eggs. Female T. chinensis were semelparous, i.e. individuals died following the release of mancae from the marsupium. Released mancae were non-planktonic and immediately infective to host shrimps. However, only a few mancae successfully established contact with a host, and it is thus assumed that the remainder were predated by shrimp. Attached T. chinensis fed on the host hemolymph, and subsequent to host death, these isopods typically searched for a new host. We also found that T. chinensis exhibits a host preference: most mancae attached to P. sinensis rather than to Neocaridina sp. or Macrobrachium nipponense. This study provides valuable empirical data that will support future research on the prevention and control of parasitic isopod infections.