Study

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.

Actions

This study is summarised as evidence for the following.

Action Category

Use acoustic devices at aquaculture systems

Action Link
Marine and Freshwater Mammal Conservation
  1. 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)

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