Non-lethal deterrance at Bonneville&Ballard.pdf - Mediate.com
Non-lethal deterrance at Bonneville&Ballard.pdf - Mediate.com
Non-lethal deterrance at Bonneville&Ballard.pdf - Mediate.com
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Acoustic barriers = Acoustic Deterrent DevicesAcoustic Deterrent Devices (ADD)• 205 decibel, 15 kHz frequency acoustic projectors installed <strong>at</strong>fishway entrances• March – May 2006• ADDs turned on <strong>at</strong> 0500 hrs on hazing days, turned off <strong>at</strong> 2000hrs <strong>at</strong> the end of each 2-day tre<strong>at</strong>ment• No significant effects on salmon passage