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Marine Measurement Science Lab (Professor Yasuzumi Fujimori)
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A lab that explores fishing technology for catching only the fish that are needed, based on fish behavior and the mechanics of fishing gear.
AboutAbout the lab
Toward fishing that catches only the fish needed
The lab of Professor Yasuzumi Fujimori studies fishing technology that lets unwanted organisms and small fish escape and catches only the fish that are needed (selective fishing), as well as technology to prevent bycatch.
Its research topics also include the selectivity and catch efficiency of fishing gear, and techniques for quantitatively sampling fish and plankton in stock surveys.
The lab also applies the behavioral characteristics of fish, such as how they respond to light and water flow, to the design of fishing gear.
Assistant Professor Makoto Tomiyasu studies the distribution and movements of marine organisms using acoustic signals and tags.
Key terms
- Bycatch
- The capture of organisms other than the targeted fish in the same net during fishing
- Selectivity
- The property by which the design of fishing gear, such as mesh size, determines which species and sizes of organisms are caught
- Biotelemetry
- A method of recording the movements and location of an organism from a distance by attaching a transmitter or a sensor-equipped tag to it
ResearchResearch themes
Modern fisheries need technology that protects fish stocks by letting unwanted fish and immature small fish escape and catching only the fish that are needed. The lab studies technology for selective fishing and bycatch prevention from two sides: the mechanics of fishing gear and fish behavior.
*Illustrative imageSelectivity of fishing gear
The relationship between mesh size and the girth of a fish determines which sizes of fish are caught (selectivity). The lab studies the principles and estimation methods of selectivity, which are essential for determining mesh sizes for stock management and for evaluating the performance of bycatch reduction devices.
*Illustrative imageSet nets that prevent seal bycatch
In coastal areas of eastern Hokkaido, fishery damage caused by Kuril harbor seals entering salmon set nets is a problem. The lab studies countermeasures that modify set nets to keep seals from getting inside.
*Illustrative imageLight and fish behavior
LEDs, which are drawing attention as a new light source for fish-attracting lamps, can emit light of specific colors. Using the underwater observation windows of an observation tower facing the Sea of Okhotsk, the lab investigates how the color of light affects fish behavior.
*Illustrative imageTracking the movements of marine organisms with tags
Sensor-equipped tags or transmitters are attached to organisms to track their underwater movements over long periods (biotelemetry). The lab has studied the migration of herring heading to spawning grounds and the opening and closing of oyster shells (Assistant Professor Tomiyasu).
MembersFaculty
- ProfessorYasuzumi Fujimori
- Assistant ProfessorMakoto Tomiyasu
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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: “Hakodate squid fishing 2005-08” Geomr / CC BY-SA 3.0 (cropped)
- Selectivity of fishing gear: “Camogli marina 08” Alessio Sbarbaro User_talk:Yoggysot / CC BY-SA 3.0 (cropped)
- Set nets that prevent seal bycatch: “Harbor seal (Phoca vitulina) at Magdalen fjord, Svalbard (1)” AWeith / CC BY-SA 4.0 (cropped)
- Light and fish behavior: “Asian city lights and green fishing boat lights (iss073e0848542)” NASA Johnson Space Center / Kimiya Yui / Public domain (cropped)
- Tracking the movements of marine organisms with tags: “Loggerhead sea turtle with satellite transmitter” Tom MacKenzie, U.S. Fish and Wildlife Service / Public domain (cropped)
- Related lab (音響計測研究室
（海洋計測学講座） ): “See the depth for yourself^^ - geograph.org.uk - 381639” Des Colhoun / CC BY-SA 2.0 (cropped) - Related lab (水産工学講座
（髙木力 教授） ): “Purse seine in Austevoll” Marius Vassnes / CC BY-SA 4.0 (cropped) - Related lab (水産情報工学研究室
（水産工学講座） ): “Ouray National Fish Hatchery-Grand Valley Unit's 24 Road indoor recirculating facility ( )” USFWS Mountain Prairie / Public domain (cropped) - Related lab (衛星資源計測学研究室
（海洋計測学講座） ): “Aquarius Sea Surface Salinity” NASA's Goddard Space Flight Center Scientific Visualization Studio / Public domain (cropped)
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