Alewifes avoid predator

Sonar records school of alewifes avoiding attack in Kennebec River, USA.
Alewifes avoid predator
Courtesy of John Truebe, Lakeside Engineering, Inc


THIS IMAGE (ABOVE) WAS CAPTURED WITH A SOUND METRICS IMAGING SONAR

To capture the data above, the imaging sonar unit was mounted to a handtruck (below).

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