Acoustic harassment devices

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.

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Study Type: 

Field study in the wild


North Carolina

Target catch: 

Spanish mackerel

Effect on bycatch species: 

Dolphins were less likely to interact with gillnets and more likely to echolocate

Effect on target catch: 

No effect


Bycatch species: 

Reduction technique: 

Fishing Gear: