Devices that emit sounds of such high intensity that they cause pain or alarm in certain underwater species. The minimum sound level is approximately 200 dB re 1 _Pa @ 1m. References for AHDs primarily dealt with aquaculture operations. These devices may exclude some animals from important habitat (Olesiuk et al., 2002), and pose a risk of impairing an animal’s hearing. These drawbacks render this approach potentially harmful and dangerous.
Submitted by morgaac on May 19, 2016 – 10:09
Submitted by twerner on June 10, 2015 – 15:39
This identifies the target catch on the Field Study Page This identifies the bycatch soecies on the Field Study Page This is the “EFFECT ON TARGET CATTH” on the field study page
- Balaenoptera acutostrata (Minke whale)
- Acoustic harassment devices
Submitted by admin on May 7, 2014 – 22:55
Submitted by Kate McClellan on January 14, 2014 – 15:02
Submitted by Kate McClellan on January 14, 2014 – 11:58
Significantly reduced seal presence Significantly increased fish catch and no fish were damaged The effectiveness of a seal scarer at a wild salmon net fishery
- Acoustic harassment devices
Submitted by Kate McClellan on January 22, 2013 – 16:36
Submitted by morgaac on October 12, 2011 – 08:23
No significant effect on bottlenose dolphins’ presence, distance from AHD, group size or time spent in the fish farm area
- Small Cetaceans (maximum length < 7.5 meters)
- Acoustic harassment devices
Submitted by AMackay on February 3, 2009 – 11:47
Reduced depredation of salmon traps by grey seals (Halichoerus grypus) Increased target catch and reduced seal damage to the catch
- Acoustic harassment devices
Submitted by admin on November 1, 2007 – 12:00
Submitted by admin on November 1, 2007 – 12:00