Acoustic Monitoring of Echolocating Porpoises

Author

Akamatsu, Tomonari ; Wang, Ding ; Wang, Kexiong ; Li, Songhai

Author_Institution

Fisheries Res. Agency, Ibaraki

fYear

2007

fDate

16-19 May 2007

Firstpage

1

Lastpage

4

Abstract

Underwater ultrasonic sound of finless porpoises Neophocaena phocaenoides were monitored concurrent with visual observations in the Yangtze River, China. In a total of 774 km cruise, 588 finless porpoises were sighted by visual observation and 44,864 ultrasonic pulses were recorded. The acoustic monitoring system could detect presence of the finless porpoises 82% of the time. False alarm in the system occurred with a frequency of 0.9%. The high frequency acoustical observation is suggested as an effective method for field surveys of small cetaceans, which produce high frequency sonar signals.

Keywords

bioacoustics; biocommunications; oceanography; ultrasonic propagation; underwater sound; zoology; China; Neophocaena phocaenoides; Yangtze River; acoustic monitoring; echolocating porpoises; finless porpoises; high frequency sonar signals; small cetaceans; ultrasonic pulses; underwater ultrasonic sound; visual observation; Acoustic signal detection; Animals; Aquaculture; Dolphins; Frequency; Monitoring; Rivers; Sonar detection; Underwater acoustics; Whales;

fLanguage

English

Publisher

ieee

Conference_Titel

OCEANS 2006 - Asia Pacific

Conference_Location

Singapore

Print_ISBN

978-1-4244-0138-3

Electronic_ISBN

978-1-4244-0138-3

Type

conf

DOI

10.1109/OCEANSAP.2006.4393821

Filename

4393821