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Usujiri Fisheries Station, Field Science Center for Northern Biosphere
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A coastal marine station where warm and cold currents meet, exploring the ecology of aquatic organisms.

AboutAbout the lab
A coastal station where warm and cold currents meet
Usujiri Fisheries Station is a facility of the Field Science Center for Northern Biosphere, which conducts education and research on the ecology, resources, and diversity of aquatic organisms.
Located on the Pacific coast of the Minamikayabe area of Hakodate, the station sees marine environments that differ by season under the influence of warm and cold currents, and is home to rich marine life.
The faculty members study the ecology of fishes that migrate between the sea and rivers, and the relationship between fishes and parasites.
The lab is located at the station in Usujiri-cho, Hakodate, not on the Hakodate Campus.
Key terms
- Diadromy
- The way of life of animals that move between the sea and rivers at set times during their lives
- Parasite
- An organism that lives on or inside another organism (the host) and obtains nutrients from it
NewsLab news
Paper by Assistant Professor Hasegawa and colleagues published in Oikos
Paper by Assistant Professor Hasegawa and colleagues published in Journal of Zoology
Paper by Assistant Professor Hasegawa and colleagues published in Marine Ecology
Paper by Assistant Professor Hasegawa and colleagues published in Trends in Parasitology
Paper by Assistant Professor Hasegawa and colleagues published in Journal of Fish Biology
ResearchResearch themes
Taking advantage of the coast of southern Hokkaido, where warm and cold currents mix, the lab studies the ecology, resources, and diversity of aquatic organisms. Its work includes the lives of fishes that migrate between the sea and rivers and the relationship between fishes and parasites.
*Illustrative imageEcology of fishes that migrate between the sea and rivers
Focusing mainly on small fishes and other diadromous animals that move between the sea and rivers, the lab investigates their ecology, how they spend their lives, and how these change with the environment.
*Illustrative imageRelationships between fishes and parasites
Targeting fishes and other aquatic organisms, the lab studies host-parasite interactions and the roles parasites play in ecosystems. The ecology of most parasites is still largely unknown.
MembersFaculty
The members of Usujiri Fisheries Station consist of faculty members, technical staff, general service assistants, and master's and undergraduate students. The director, Professor Yotsukura, is a faculty member of Oshoro Marine Station who holds the position concurrently.As of 2026
- ProfessorNorishige Yotsukura
- Associate ProfessorMidori Iida
- Assistant ProfessorRyota Hasegawa
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Usujiri Fishing Port 20220605” Reh gambare / CC BY-SA 4.0 (cropped)
- Ecology of fishes that migrate between the sea and rivers: “Sicyopterus japonicus” Show ryu / CC BY-SA 3.0 (cropped)
- Relationships between fishes and parasites: “Salvelinus leucomaenis leucomaenis Chitose 1” Totti / CC BY-SA 4.0 (cropped)
- Related lab (Salmon Biology Lab (Marine Symbiosis Division)): “Chum salmon leaping ( )” U.S. Fish and Wildlife Service Headquarters / Public domain (cropped)
- Related lab (Marine Symbiosis Lab (Associate Professor John Richard Bower)): “Enteroctopus dolfeini” NOAA/R. N. Lea [1] / Public domain (cropped)
- Related lab (Ooki Lab (Marine Environmental Science Division)): “Uchiura-bay Yakumo” Bakkai at Japanese Wikipedia / CC BY-SA 3.0 (cropped)
- Related lab (Animal Ecology Lab): “Hon-yadokari1104-1” ふうけ / CC BY-SA 3.0 (cropped)
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