Study

Pingers cause temporary habitat displacement in the harbour porpoise Phocoena phocoena

  • Published source details Kyhn L.A., Jørgensen P.B., Carstensen J., Bech N.I., Tougaard J., Dabelsteen T. & Teilmann J. (2015) Pingers cause temporary habitat displacement in the harbour porpoise Phocoena phocoena. Marine Ecology Progress Series, 526, 253-265

Actions

This study is summarised as evidence for the following.

Action Category

Use acoustic devices on fishing gear

Action Link
Marine and Freshwater Mammal Conservation
  1. Use acoustic devices on fishing gear

    A controlled study in 2005 in a pelagic area of the Great Belt, Denmark (Khyn et al. 2015) found that using active acoustic devices of two types on simulated fishing nets resulted in fewer detections of harbour porpoises Phocoena phocoena compared to when devices were inactive. Harbour porpoise detection rates within each of two 0.6 km2 areas were lower when two types of acoustic device were active (‘Airmar’ devices: 40% lower; ‘SaveWave’ devices: 65% lower) compared to when devices were inactive (data reported as statistical model results). Detection rates at three control sites without acoustic devices located 2.5, 3 and 5 km away did not change significantly over the same period. Acoustic devices were deployed across two areas (each 0.6 km2). Fifty-five ‘Airmar’ devices (emitting 300 ms pulses every 4 seconds at 10 kHz) were deployed 100 m apart in one area.  Fifteen ‘SaveWave Black Save’ devices (emitting pulses of 200–900 ms every 4–16 seconds with frequency sweeps of 30–60 kHz) were deployed 200 m apart in the other. In May–June 2005, the acoustic devices were alternately activated and deactivated for six repeating cycles of 2–9 days to simulate gill net fishery deployments. Seven acoustic detectors (two in each area; three at control sites) recorded porpoise echolocation clicks during each of the two acoustic device deployments.

    (Summarised by: Anna Berthinussen)

Output references

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