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<p>A survey was conducted across 11 provinces in Northern Vietnam to investigate the distribution of <i>Dollfustrema bagarii</i> metacercariae – a causative agent of significant losses in cultured channel catfish (<i>Ictalurus punctatus</i>) – and to identify its first intermediate host. A total of 337 fish specimens were collected from 103 farms. Metacercariae of <i>D. bagarii</i> were detected in 72 farms (69.9% of farms), and 44.51% of the sampled fish were positive. The prevalence in lowland provinces was 3.14 times higher than that in mountainous regions (<i>p</i> &lt; 0.001), while no significant difference was observed between fish cultured in reservoir/lake and those in river (<i>p</i> = 0.634). We identified the golden mussel <i>Limnoperna fortunei</i> (Bivalvia: Mytilidae) as the first intermediate host of <i>D. bagarii</i>. The morphological characteristics of its daughter sporocyst and cercariae were described, and the identification was confirmed through comparison of <i>28&#xa0;S</i> rDNA sequences with those of <i>D. bagarii</i>.</p>

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Occurrence and host associations of Dollfustrema bagarii (Digenea: Bucephalidae) in channel catfish cage culture in Northern Vietnam

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月18日

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  • Hung-Anh Le,
  • Manh Duc Vu,
  • Truong Dinh Hoai,
  • Van Kim Van,
  • Minh Anh Kim,
  • Ha Nguyen Van,
  • Hoang Van Hien,
  • Nguyen Ngoc Chinh,
  • Anh Tuan Tran,
  • Nadezhda Simonova,
  • Dmitry Atopkin,
  • Stephen E. Greiman,
  • Henry Madsen,
  • Hung Manh Nguyen

摘要

A survey was conducted across 11 provinces in Northern Vietnam to investigate the distribution of Dollfustrema bagarii metacercariae – a causative agent of significant losses in cultured channel catfish (Ictalurus punctatus) – and to identify its first intermediate host. A total of 337 fish specimens were collected from 103 farms. Metacercariae of D. bagarii were detected in 72 farms (69.9% of farms), and 44.51% of the sampled fish were positive. The prevalence in lowland provinces was 3.14 times higher than that in mountainous regions (p < 0.001), while no significant difference was observed between fish cultured in reservoir/lake and those in river (p = 0.634). We identified the golden mussel Limnoperna fortunei (Bivalvia: Mytilidae) as the first intermediate host of D. bagarii. The morphological characteristics of its daughter sporocyst and cercariae were described, and the identification was confirmed through comparison of 28 S rDNA sequences with those of D. bagarii.