This image shows an application of active sonar remote
sensing to map fish populations and habitat. Sonar involves the active emission
of sound pulses, which are reflected by objects that have a different density
than the surrounding water. In this application, the sound wave is reflected
off of the air-filled swim bladder inside the fish (the white arrow in the
center of the image points to a school of fish), and the strength of the echo
(represented by color) increases with the size of the fish. The arrow on the
right points to the seafloor, which also reflects sonar. This application of
sonar is commonly used by researchers and commercial fisheries, and also by
members of the public in portable fishfinders, which are used by anglers to
locate good fishing spots.
Original image from: https://flowergarden.noaa.gov/
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