魚病研究
Online ISSN : 1881-7335
Print ISSN : 0388-788X
ISSN-L : 0388-788X
54 巻 , 1 号
選択された号の論文の4件中1~4を表示しています
論文
  • Norihiko Komatsu, Naoki Itoh, Kazuo Ogawa
    原稿種別: Research Article
    2019 年 54 巻 1 号 p. 1-11
    発行日: 2019/03/15
    公開日: 2019/04/03
    ジャーナル 認証あり

    In 2015, cataract was observed in juvenile Japanese dace Tribolodon hakonensis, reared in a hatchery in Nagano Prefecture, Japan. ​Metacercariae were found in the lens, with the prevalence and mean intensity of infection of dace (0.5–2.4 g in body weight) reaching 100% and 39.7, respectively, in the most heavily infected fish group. ​Histologically, the lens became partially fragmented around the metacercariae, which occupied a considerable space, surrounded by their own excreta. ​Among snails sampled from outdoor ponds and waterways, cercariae with a bifurcated tail were found in the lymnaeid, Radix auricularia japonica. ITS1-5.8S-ITS2 and cytochrome oxidase subunit I (COI) sequences of metacercariae from the lens of dace and cercariae from the lymnaeid were nearly identical to each other, indicating that the lymnaeid is the first and dace is the second intermediate host. ​However, since the obtained COI gene sequences were close but not identical to known Diplostomum spp., this species was not identified to the species level. ​The morphology of metacercaria was also described. ​This is the second reported case of worm cataract in fish caused by Diplostomum metacercariae in Japan.

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