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A multibeam sonar tool, called Dual-Head Multibeam Sonar, is a modification of a hydroacoustic device commonly used to map the bottom of oceans. The dual-head sonar nonintrusively tracks a fish's swimming direction and velocity over a large volume of water. Information collected by the multibeam sonar tool is transferred to computer software designed by PNNL. This software, called MTrack, tracks individual fish and allows for creation of a three-dimensional animation of what took place underwater. In this image, MTrack displays movement of juvenile salmon as they approach Bonneville Dam.

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Document Title: Dual-Head Multibeam Sonar and MTrack
Category: Wildlife and Environmental Studies
Media Type: Graphics
Date of Image/Photo: 1999
Background: See press release at http://www.pnl.gov/news/1999/fish.htm
URL of this page: http://picturethis.pnl.gov/picturet.nsf/by+id/SMAA-4AQNDA

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