Target-specific acoustic predator deterrence in the marine environment
-
Published source details
Götz T. & Janik V.M. (2015) Target-specific acoustic predator deterrence in the marine environment. Animal Conservation, 18, 102-111.
Published source details Götz T. & Janik V.M. (2015) Target-specific acoustic predator deterrence in the marine environment. Animal Conservation, 18, 102-111.
Actions
This study is summarised as evidence for the following.
| Action | Category | |
|---|---|---|
|
Use acoustic devices at aquaculture systems Action Link |
 |
-
Use acoustic devices at aquaculture systems
A controlled study in 2007 at a fish farm in the North Atlantic Ocean, Scotland, UK (Götz & Janik 2015) found that using an acoustic device reduced the number of harbour seals Phoca vitulina that approached a fish cage. Overall, fewer seals approached within 250 m of the cage when an acoustic device was used (2 seals) than when a device was not used (17 seals). No significant difference in numbers of approaches was found at distances of 250–1,500 m (with device: 8 seals; without: 11 seals) or >1,500 m from the cage (with device: 8 seals; without: 7 seals). Sixteen experimental trials (with an acoustic device) and 16 control trials (without a device) were carried out. Each trial lasted an average of 3.5 h. The device (an underwater loudspeaker emitting 200 ms pulses with a peak frequency of 950–1,000 Hz) was placed on a fish cage with the transducer at a depth of 17 m. Seals were tracked with a theodolite from the shore during each of the 32 trials in June–July 2007.
(Summarised by: Anna Berthinussen)
)_2023.JPG)
