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Behavior Measurement Engineering Lab
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The lab uses cameras and AI to measure fish behavior and body size, with applications in fisheries and aquaculture.
AboutAbout the lab
Measuring from the fish's point of view: field, cameras, and AI.
The Behavior Measurement Engineering Lab is a field-centered lab that contributes to the fishing industry by measuring the behavior and condition of fish.
The lab films fish at sea and at aquaculture sites, and uses cameras, AI (image recognition), and stereo vision to measure the movement of fish schools and the size of individual fish without touching them.
Based on the data obtained, the lab aims to improve the design of fishing gear and the management of aquaculture.
The lab also does biology research that uses image processing, such as examining from images the body shape features that indicate a fish's age and the development of its eggs.
Key terms
- Stereo camera
- A device that uses two or more cameras to photograph the same object from different angles and determines depth and size by the principle of triangulation.
- Set net
- A fishing method in which a net is set at a fixed place in the sea and catches the fish that enter it. It is a fishery that waits for the fish to come.
- Fish welfare
- The idea of considering whether the environment is comfortable for farmed fish and raising them while reducing their stress.
NewsLab news
A student's paper was published in Fisheries Science (swimming depth of farmed red sea bream)
A student's paper was published in Aquaculture (swimming speed of farmed yellowtail)
A paper on measuring the swimming speed of farmed yellowtail with stereo cameras was published in Fisheries Engineering
A master's student received the Shigeo Sasa Award of the Graduate School of Fisheries Sciences
A master's student presented a paper on estimating the swimming speed of fish filmed amid waves
ResearchResearch themes
Research on fisheries and aquaculture often requires monitoring the movement of fish schools and the body size of fish in many different situations. Among the available methods, such as direct visual observation, acoustics, and biologging, the lab studies measurement methods that use images and video.
*Illustrative imageMeasuring Fish in 3D with Stereo Cameras
Fish swim in three dimensions underwater, so measurement that includes depth is essential. The lab is developing methods that use low-cost stereo cameras, built by combining commercially available waterproof cameras, to measure the swimming paths, speed, and body size of fish.
*Illustrative imageHow Fish Are Caught in Set Nets
In a set net, the sequence of behaviors of the fish school entering the net determines whether the catch succeeds. The lab measures fish school behavior with cameras and, together with the fish school behavior simulation of the Fisheries Information Engineering Lab, investigates the process that leads to a catch.
*Illustrative imageMonitoring the Growth and Behavior of Farmed Fish
Managing the body size of farmed fish is essential for adjusting shipments and for feeding according to growth. The lab uses stereo images to measure body size and growth without touching the fish, and also records school behavior, which is important for assessing fish welfare.
*Illustrative imageStudying Fish Ecology with Stereo Cameras
There is a need for methods to accurately study, from a distance, fish for which catch data are hard to collect, such as Pacific bluefin tuna. Using 3D measurement with stereo cameras, the lab investigates the body size, swimming posture, and school density of fish in the natural sea.
MembersFaculty
The members of the Behavior Measurement Engineering Lab consist of faculty members, a Visiting Associate Professor, technical assistants, doctoral, master's, and undergraduate students, and research students.As of 2026
- Associate ProfessorKazuyoshi Komeyama
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: “Pacific bluefin tuna” aes256 / CC BY 2.1 jp (cropped)
- Measuring Fish in 3D with Stereo Cameras: “Underwater motion capture cameras” Prasha.ina / CC BY-SA 3.0 (cropped)
- How Fish Are Caught in Set Nets: “Set net fishing at Mitsu, Amino, Kyotango” Y.Suetsugu / CC BY-SA 4.0 (cropped)
- Monitoring the Growth and Behavior of Farmed Fish: “Farmed salmon net pens - panoramio” Sam Beebe/Ecotrust / CC BY-SA 3.0 (cropped)
- Studying Fish Ecology with Stereo Cameras: “Thunnus orientalis (Osaka Kaiyukan Aquarium)” OpenCage / CC BY-SA 2.5 (cropped)
- Related lab (Field Science Center for Northern Biosphere, Ecosystem Change Analysis Lab): “Tracking Sea Turtles ( )” U.S. Geological Survey from Reston, VA, USA / Public domain (cropped)
- Related lab (Fisheries Engineering Lab (Prof. Tsutomu Takagi)): “Purse seine in Austevoll” Marius Vassnes / CC BY-SA 4.0 (cropped)
- Related lab (Fisheries Engineering Lab): “Salabarde (Ifremer )” Marc Taquet / CC BY 4.0 (cropped)
- Related lab (Fisheries Information Engineering Lab (Fisheries Engineering Division)): “Ouray National Fish Hatchery-Grand Valley Unit's 24 Road indoor recirculating facility ( )” USFWS Mountain Prairie / Public domain (cropped)
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