||Argulus coregoni (Branchiura: Argulidae) parasitic on wild and cultured Oncorhynchus masou ishikawae (Salmonidae) in Yamaguchi Prefecture, western Honshu, Japan
Nagasawa, Kazuya ,
Hatama, ToshihiroNitta, Masato
163 , 2017-09-20 , 日本生物地理学会
The argulid branchiuran Argulus coregoni Thorell, 1864 was collected from the body surface of wild anadromous and farmed fluvial individuals of Oncorhynchus masou ishikawae Jordan & McGregor, 1925 in Yamaguchi Prefecture, the westernmost prefecture of Honshu Island, Japan. These are the first records of A. coregoni from Yamaguchi Prefecture and extend its geographical distributional range in Japan from the neighboring Shimane and Hiroshima prefectures westward to Yamaguchi Prefecture. As fluvial individuals of O. masou ishikawae occur more widely and abundantly than anadromous ones in this prefecture, the former fish are considered to serve as the major host for A. coregoni in the rivers.