Acoustic Harassment Devices



Aquaculture Cage: Photo by NOAA Photo Library.

Aquaculture Cage: Photo by NOAA Photo Library.

Marine aquaculture is a rapidly developing field. The protein conversion inefficiencies notwithstanding, the sea-pens and enclosures are also targets for marine life – mostly seals and sea lions, that don’t miss the fact that if they can broach the barriers they could be on “easy street.” In order to protect their enterprises marine fish farms employ “acoustic harassment devices” to discourage predation by the resident carnivores.

As to be expected these devices sound nasty to the target predator. These devices displace the normal habitat of any animal that can hear them. There is naturally spill-over, so in addition to marine fish farms competing with wild animal food sources to feed their stock, they also disrupt wild animal’s acoustic habitats.

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