Underwater acoustic measurement
To estimate resource distribution and abundance, use sound wave instead of radio wave, which weakens under the water.
Measurement of echo from fish:
Body angle influences the target strength (TS). Ribbonfish’s upright posture makes a big difference of the TS.
Field research on the fishing boat:
Estimate distribution and abundance of ribbionfish at the Bungo channel, known as a place of origin of the fish.
Biologging and Biotelemetry
Animals with loggers or pingers record their behavior by themselves. We have become able to track their lives under the water.
While data are accumulated in a tag for biologging, they are transmitted from the remote distance to a researcher for biotelemetry.
Tracking the spawning migration of pacific herrings:
Reveal pacific herrings' fast migration to the spawning area in the coast.
Measurement of shell movements of pacific oysters:Detect the shell movements from breathing and feeding behavior with an acceleration logger