A passive acoustical survey method of finless porpoises
Akamatsu, Tomonari1; Wang, Ding2; Wang, Kexiong2; Wei, Zhuo2; Naito, Yasuhiko
AbstractThe finless porpoises (Neophocaena phocaenoides) have narrow band and high frequency sonar signals, which are distinctive from background noises. Underwater sound monitoring with hydrophones placed along the sides of a research vessel, concurrent with visual observations was conducted in the Yangtze River from Wuhan to Poyang Lake in China. In a total of 774 km cruise, 588 finless porpoises were sighted by visual observation and 44,864 ultrasonic pulses were recorded by the acoustical observation system. The acoustic monitoring system could detect presence of the finless porpoises 88% of the time, 300 m away from the hydrophone. False alarm in the system occurred with a frequency of 0.9%. Such a high detection performance of the present system was due to a large sound pressure level of sonar signals and frequent sound production. Over 160 dB off-axis sound pressure level and sonar signal production at every 3 to 4 s were observed by an acoustic and a behavioral data logger. The high frequency acoustical observation is suggested as an effective method for field surveys of small cetaceans, which produce sonar signals.
KeywordEcholocation Dolphin Porpoise Sonar Underwater Acoustics Data Logger
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine
Indexed BySCI
WOS Research AreaFisheries
WOS SubjectFisheries
WOS IDWOS:000207780600067
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Document Type期刊论文
Affiliation1.Natl Res Inst Fisheries Engn, Kashima, Ibaraki 3140421, Japan
2.Chinese Acad Sci, Inst Hydrol, Wuhan 430072, Peoples R China
Recommended Citation
GB/T 7714
Akamatsu, Tomonari,Wang, Ding,Wang, Kexiong,et al. A passive acoustical survey method of finless porpoises[J]. FISHERIES SCIENCE,2002,68:294-297.
APA Akamatsu, Tomonari,Wang, Ding,Wang, Kexiong,Wei, Zhuo,&Naito, Yasuhiko.(2002).A passive acoustical survey method of finless porpoises.FISHERIES SCIENCE,68,294-297.
MLA Akamatsu, Tomonari,et al."A passive acoustical survey method of finless porpoises".FISHERIES SCIENCE 68(2002):294-297.
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