DOI: 10.6620/ZS.2023.62-21
New optional intermediate hosts of Mothocya parvostis (Isopoda: Cymothoidae): Juveniles of the cobaltcap silverside Hypoatherina tsurugae (Atheriniformes: Atherinidae) and the yellowfin seabream Acanthopagrus latus (Perciformes: Sparidae)
DOI:
https://doi.org/10.51094/jxiv.91キーワード:
Life cycle、 Manca、 New host record、 Parasitic cymothoid、 Prevalence抄録
Mothocya parvostis (Isopoda: Cymothoidae) is a crustacean that infests the opercular cavities of fishes. Its main definitive host is Japanese halfbeak Hyporhamphus sajori. However, M. parvostis also infests black sea bream Acanthopagrus schelgelii as an optional intermediate host. Hence, to infest not only definitive hosts but also optional intermediate hosts; this is important for understanding the life history of Cymothoidae, and further information should be obtained. In this study, 20 and 144 cymothoids (mancae and juveniles, respectively) were collected from 129 cobaltcap silversides Hypoatherina tsurugae and 494 yellowfin seabreams Acanthopagrus latus. Molecular analysis of the cytochrome c oxidase subunit I gene and 16S rRNA genes revealed that cymothoid mancae and juveniles from the two fish species were identified to be M. parvostis. Hypoatherina tsurugae and A. latus juveniles were optional intermediate hosts of M. parvostis. Mothocya parvostis mancae infested juveniles of both species just after metamorphosis, grew with the host, and detached from the fish as juveniles continued growing. The parasitic status of M. parvostis in the three optional intermediate hosts indicated that M. parvostis likely reproduced from June to December, and different optional intermediate hosts were used depending on the time of year in Hiroshima Bay. Therefore, a parasitic strategy involving optional intermediate hosts might increase the infestation success of M. parvostis to H. sajori.
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Fujita, Hiroki
Kawai, Kentaro
Deville, Diego
Umino, Tetsuya
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