1. How do trawlers use echo method to find location of shoals of fish?
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They can use sonar technology in which transmitted sound is received and the time between. transmittance and receiving is calculated to find the distance of fish from the trawler...
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Explanation:
An echo-sounder has a screen nearby the helm and a unit placed under the boat. This unit has a sound transformer (transducer) which transmits high frequency sound waves through the water. These hit the seabed or a shoal of fish in the water column and send an echo back which is captured by the transducer
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