2012 - 2015 The role of interspecific competition between nonnative fishes on successful establishment of nonnative fish
2009 - 2010 河川改修が在来種ヤマメと外来種ブラウントラウトの種間競争に与える影響の解明
2005 - 2006 サケ科魚類における在来種から外来種への置換のメカニズムの解明
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Papers (53):
Jumpei Okado, Koh Hasegawa. Exploring predators of Pacific salmon throughout their life history: the case of Japanese chum, pink, and masu salmon. Reviews in Fish Biology and Fisheries. 2024
Yuhei Ogura, Koh Hasegawa. Infection status of masu salmon Oncorhynchus masou by the parasite Salmonema cf. ephemeridarum (Nematoda, Cystidicolidae). Journal of Fish Biology. 2024
Koh Hasegawa, Jumpei Okado, Genki Sahashi, Sho Fukui, Yuhei Ogura, Kazumasa Ohkuma. The strength of density dependence on body size of young-of-the-year masu salmon, Oncorhynchus masou, varies over ontogeny in Horokashubuto stream, Hokkaido, northern Japan. Ecology of Freshwater Fish. 2024
Kurt D. Fausch, Kentaro Morita, Jun-ichi Tsuboi, Yoichiro Kanno, Shoichiro Yamamoto, Daisuke Kishi, Jason B. Dunham, Itsuro Koizumi, Koh Hasegawa, Mikio Inoue, et al. The past, present, and a future for native charr in Japan. Ichthyological Research. 2024
Koh Hasegawa, Yutaka Yano, Kentaro Honda, Yuhei Ogura. DHA and EPA levels in a piscivorous fish changed by preying upon stocked salmon fry. Scientific Reports. 2023