Long-term effectiveness of pingers on a small population of finless porpoises in Japan
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Published source details
Amano M., Kusumoto M., Abe M. & Akamatsu T. (2017) Long-term effectiveness of pingers on a small population of finless porpoises in Japan. Endangered Species Research, 32, 35-40.
Published source details Amano M., Kusumoto M., Abe M. & Akamatsu T. (2017) Long-term effectiveness of pingers on a small population of finless porpoises in Japan. Endangered Species Research, 32, 35-40.
Actions
This study is summarised as evidence for the following.
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Use acoustic devices on fishing gear Action Link |
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Use acoustic devices on fishing gear
A controlled study in 2011–2012 of a pelagic site in Omura Bay, Japan (Amano et al. 2017) found that using two acoustic devices on a fishing net reduced the number of encounters of finless porpoises (Neophocaena) with the net. Fewer finless porpoise encounters were recorded each day at the net when the acoustic devices were turned on than when they were turned off (data reported as statistical model results). Two acoustic devices (Aquatec AQUAmark 100) were attached to a fishing net (one on the upper rope of the guide net, one at the entrance of the enclosure net) at a depth of 30 cm. The net was deployed in water 10–15 m deep. Both acoustic devices were turned on (emitting 200–300 ms pulses at 20–160 kHz) or off (silent) for alternating two-week periods in April–December 2011 and 2012. A passive acoustic event recorder deployed 40 m offshore from the net at a depth of 1.5 m recorded daily encounters of finless porpoises.
(Summarised by: Anna Berthinussen)
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