2026-03-13T11:34:15Z https://fra.repo.nii.ac.jp/oai

oai:fra.repo.nii.ac.jp:02002141 2025-08-13T06:50:13Z 15

New records of a freshwater fish parasite Argulus japonicus (Branchiura: Argulidae) from northern Honshu, Japan, with a note on its occurrence in a brackish water lake Nagasawa, Kazuya 長澤, 和也 ナガサワ, カズヤ Hiroshima University 広島大学 20865422 Nitta, Masato 新田, 理人 ニッタ, マサト Nitta 新田 ニッタ Masato 理人 マサト Azuma, Nobuyuki 東, 信行 アズマ, ノブユキ Hirosaki University 弘前大学 parasitic crustacean; fish louse; new locality record; new host record; northern Honshu; big-scaled redfin One and two specimens of Argulus japonicus Thiele, 1900 were collected from the body surface of big-scaled redfin Pseudaspius hakonensis (Günther, 1877) (Cypriniformes: Leuciscidae) in the Babame River, Akita Prefecture, and Lake Jusan, Aomori Prefecture, northern Honshu, Japan, respectively. This is two new prefecture records in Japan and a new host record for A. japonicus. Lake Jusan is the northernmost collection locality of this parasite in Japan recorded from wild fishes. As Lake Jusan is a brackish water lake and big-scaled redfin is known to migrate from fresh to salt waters, and since A. japonicus completes its life cycle in fresh waters, we infer that the two individuals of A. japonicus parasitized the big-scaled redfin in an inflowing river, then this fish was collected along with the surviving argulid individuals after migrating to the lake. The collection of A. japonicus in Lake Jusan represents the second record for the species from brackish water lakes in Japan. Carcinological Society of Japan 日本甲殻類学会 2024-02-07 eng journal article SMUR https://fra.repo.nii.ac.jp/records/2002141 10.18353/crustacea.53.0_1 23336024 水産技術研究所　養殖部門　病理部 （南勢） https://www.jstage.jst.go.jp/article/crustacea/53/0/53_1/_article J-STAGE 2189-5317 0287-3478 Crustacean Research 53 15 1 15 https://fra.repo.nii.ac.jp/record/2002141/files/Nagasaaw et al New records of a fresh parasite.pdf application/pdf 545 KB 2024-05-08