Departmental Bulletin Paper 北海道北見市内での国内外来種モツゴの発見
Discovery of Alien Species, Topmouth Gudgeon (Pseudorasbora parva) in Kitami, Hokkaido
ホッカイドウ キタミ シナイ デノ コクナイ ガイライシュ モツゴ ノ ハッケン

菅野, 貴久  ,  金岩, 稔  ,  Takahisa, Kanno  ,  Minoru, Kanaiwa  ,  東京農業大学大学院生物産業学研究科アクアバイオ学専攻  ,  東京農業大学生物産業学部アクアバイオ学科  ,  Department of Aquatic Bioscience, Graduate School of Bioindustry, Tokyo University of Agriculture  ,  Department of Aquatic Bioscience, Faculty of Bioindustry, Tokyo University of Agriculture

61 ( 1 )  , pp.48 - 50 , 2016-06-20
The alien species topmouth gudgeon (Pseudorasbora parva) was captured in the lake at Notsukeushi Park, Kitami, Hokkaido on November 4, 2015. This study is the first report on the discovery of topmouth gudgeon observed around the area near the coast of the Okhotsk Sea. The reproductive status and the introduction process in Notsukeushi Park are currently unknown. However, the probability of reproduction is high because a fish measuring 32mm was observed and was considered to be a the yearling fish. There are two possibilities for the introduction: one is that topmouth gudgeon was sold around the area, and might have been dumped. The other is that other fishes were released into the lake and topmouth gudgeon was accidentally introduced with them. We should continue monitoring to confirm whether topmouth gudgeon has already been established in Notsukeushi Park and what the impact on the native species is. Then we have to develop methods to prevent the further spread of this species and bring awareness to the general public.

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