Underwater acoustic measurement
Section outline
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To estimate resource distribution and abundance, use sound wave instead of radio wave, which weakens under the water.
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Measurement of echo from fish:
Body angle influences the target strength (TS). Ribbonfish’s upright posture makes a big difference of the TS.
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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.
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