近年來臺灣水族市場上以霓虹脂鯉屬為主的燈科魚類,日益頻繁出現類似線蟲(Nematoda like)感染的膚胞蟲病案例。本研究透過光學觀察、病理切片,以及分子親緣等方式,檢驗綠蓮燈(Paracheirodon simulans)病徵外觀與組織,證實其病原體為中生動物綱(Mesomycetozoea)之膚孢蟲屬(Dermocystidium)寄生性原生生物,並成為膚孢蟲屬物種寄生於新寄主(host)──綠蓮燈的首筆紀錄。 本研究亦描述在肝臟、脾臟、腸道、肌肉等處,均可見到不同發育時期的膚孢蟲,可做為日後膚孢蟲症診斷依據;並經分子親緣分析,提出傳統型態分類與分子證據衝突之質疑。
Increasing cases of Nematoda like dermocystidiosis infection in characids (Characidae), predominantly Paracheirodon, were reported in Taiwan’s aquarium fish markets. This research utilizes optical observation, histological and molecular methods to characterize the lesion of Nematoda like infections in Paracheirodon simulans. Here, we identify the pathogen in question to be a parasitic protist under Dermocystidium of Mesomycetozoea. This is the first time Paracheirodon simulans being documented as a host of Dermocystidium. In this study, dermocystidiosis of different stages are also described in various organs, including liver, spleen, intestines and muscles. The study can serve as the basis of diagnosis for dermocystidiosis. Additionally, discrepancies between molecular phylogenetics and traditional morphology-based taxonomy are addressed.
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