A Parasitological Survey of Sockeye Salmon (Oncorhynchus nerka) and Dolly Varden (Salvelinus malma) from the Ozernaya River System, Kamchatka
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概要
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Adult sockeye salmon Oncorhynchus nerka from the Ozernaya River near the outlet of Lake Kuril were infected with Myxobolus arcticus (Myxozoa) in the brain and spinal cord and with Philonema oncorhynchi (Nematoda) in the peritoneal cavity. Some of these sockeye salmon were affected by light visceral adhesions. This pathological condition was found in male fish only. Myxobolus arcticus was also found in the brain of adult Dolly Varden Salvelinus malma from a river flowing into Lake Kuril. There was no substantial difference in spore measurement of M. arcticus from salmonids among Kamchatka (Russia), Hokkaido (Japan), and British Columbia (Canada). The Dolly Varden carried Salmincola carpionis (Copepoda) on the roof and floor of the buccal cavity and Anisakis simplex (third-stage larvae) (Nematoda) on the viscera.1992年8月にオゼルナヤ川水系でベニザケとオショロコマの寄生虫調査を実施した. クリル湖の流出口に近いオゼルナヤ川で採集したベニザケ成熟魚は,脳と脊髄に粘液胞子虫類のMyxobolus arcticus, 腹腔内に線虫類のPhilonema oncorhynchiの寄生を受けていた. ベニザケには軽い内臓癒着症を呈した個体があり, それは雄魚だけに認められた. Myxobolus arcticusの寄生は, クリル湖に流入するビチェンキア川で採集したオショロコマの脳にも認められた. ベニザケとオショロコマから得たMyxobolus arcticusの胞子の計測値は, 北海道(日本)やブリティッシュ・コロンビア州(カナダ)のベニザケから得たMyxobolus arcticusの胞子の計測値とほぼ同じであった. オショロコマは, 口腔壁にカイアシ類のSalmincola carpionis, 腹腔内に線虫類のAnisakis simplex(第3期幼虫)の寄生を受けていた.
- 水産庁北海道さけ･ます･ふ化場の論文
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