著者

Kazuya Nagasawa Daisuke Kishi Tetsuya Tokuhara

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.27, no.1, pp.159-166, 2022-04-22 (Released:2022-04-22)

参考文献数

42

被引用文献数

2

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Argulus coregoni Thorell, 1864 was collected from white-spotted char, Salvelinus leucomaenis (Pallas, 1814), red-spotted masu salmon, Oncorhynchus masou ishikawae Jordan and McGregor, 1925, masu salmon, O. m. masou (Brevoort, 1856), and a hybrid between white-spotted char and masu salmon in mountain streams, Gifu Prefecture, central Japan. The host’s body surface under and near the pectoral fins was the most common infection site for A. coregoni. The infected white-spotted char were caught at high elevations (461–873 m) in the headwater streams. The infected individuals of the two masu salmon subspecies were mostly caught in the upper river reaches, but the elevations where they were caught were lower (237–733 m and 660–707 m, respectively) than those of the white-spotted char. Since A. coregoni is also known as a parasite of ayu, Plecoglossus altivelis altivelis (Temminck and Schlegel, 1846), in the middle and lower river reaches in the prefecture, this parasite utilizes different fish species as its hosts along a river course: white-spotted char and the two masu salmon subspecies serve as the hosts, respectively, in the headwater and the middle to lower sections of the upper reaches, but in the mid- and lower river reaches, ayu is the important host.

著者

米倉 竜次 苅谷 哲治 藤井 亮吏 熊崎 博 斉藤 薫 熊崎 隆夫 桑田 知宣 原 徹 徳原 哲也 景山 哲史 RYUJI YONEKURA TETSUJI KARIYA RYOUJI FUJII HIROSHI KUMAZAKI KAORU SAITO TAKAO KUMAZAKI TOMONORI KUWADA TORU HARA TETSUYA TOKUHARA TETSUJI KAGEYAMA 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 岐阜県河川環境研究所 Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments Gifu Prefectural Research Institute for Freshwater Fish and Aquatic Environments

出版者

The Japanese Society of Fisheries Science

雑誌

日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)

巻号頁・発行日

vol.73, no.5, pp.839-843, 2007-09-15

参考文献数

20

被引用文献数

1 5

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We examined the effectiveness of removal by angling in order to control the population size of the invasive exotic bluegill in Hananoko Lake, Gifu, Japan. A total of 15, 966 individuals were caught by angling. Estimates based on a mark-recapture method revealed that the population size was reduced from 24, 231 to 10, 092 individuals over 15 months of population control. The change in the size distribution suggested that removal by angling not only reduced the number of potentially mature individuals but also decreased the recruitment of juvenile fish. This evidence indicates that removal by angling could control the population size of the bluegill, although a complete extermination by angling alone may be difficult.