Six different acoustic pingers and signals were tested at sea to determine their impact on dolphin behavior. Two prototype devices from the Board Iascaigh Mhara (BIM) were tested. One was a continuous pinger (CP) and the second a responsive pinger (RP). These were tested on five occasions. A third modified RP was also tested on five occasions and a fourth RP was modified into a multiple signal output device and tested on 15 occasions. In addition, the CETASAVER and Dolphin Deterrent Device (DDD) were tested on five and ten occasions respectively. The BIM and RP acoustic pingers did not elicit any response from the dolphins. The CETASAVER and DDD elicited a mild response. The authors suggest significant modification to the signal type or source level. At the current state of development acoustic pingers may not provide effective deterrent signals to dolphins.
Year
Journal/Publisher Name
Journal of Cetacean Research and Management
Volume (Issue #)
10
Page #s
227-233
Contact information
simon.berrow@shannondolphins.ie
Summary
Field Studies
Effect of acoustic deterrents on the behavior of common dolphins (Delphinus delphis)
Study Type
Field study in the wild
Location
Ireland
Target catch
none
Effect on bycatch species
CETASAVER and Dolphin Deterrent Device resulted in mild responses by dolphins. BIM pingers elicited no response.
Effect on target catch
N/A
Bycatch species
Fishing Gear