JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-OS Ocean Sciences & Ocean Environment

[A-OS26] [JJ] Research on the biodiversity of ocean ecosystems for the conservation of marine biological resources

Sun. May 21, 2017 1:45 PM - 3:15 PM 303 (International Conference Hall 3F)

convener:Isao Koike(University of Ryukyus), KAORU NAKATA(Japanese Fisheries Research and Education Agency), Katsunori FUJIKURA(Japan Agency for Marine-Earth Science and Technology), Hiroya Sugisaki(Japan Fisheries Research and Education Agency), Chairperson:Katunori Fujikura(Japan Agency for Marine-Earth Science and Technology), Chairperson:Hiroya Sugisaki(National Research and Development Agency Japan Fisheries and Education Agency)

2:00 PM - 2:15 PM

[AOS26-02] Acoustic remote sensing of marine organisms

*Akamatsu Tomonari1, Katsuyoshi Kawaguchi2, Ryoichi Iwase2, Syuhei Nishida2, Tomohito Imaizumi3, Ryuzo Takahashi3, Koichi Sawada3, Ikuo Matsuo4 (1.National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, 2.Japan Agency for Marine-Earth Science and Technology, 3.National Research Institute of Fisheries Engineering, Japan Fisheries Research and Education Agency, 4.Tohoku Gakuin University)

Keywords: passive acoustic monitoring, submarine cable, fish echosounder

The goal of our project is to provide maps of aquatic animals similar to the satellite image of clouds. Three major means for the visualization were the passive acoustics, the active acoustics, and the submarine cables. Approximately 100,000 hours recording was conducted during 5 years period in this project. In addition, 20 years recordings, which was archived by the cable systems were included for the analysis. Species specific detectors were developed referring the sound feature database of crustaceans, fish and marine mammals. By far, passive acoustic monitoring have been applicable only for the presence of phonating animals. Hydrophone array systems and mathematical models enabled monitoring of spatial distribution, behavior and number of animals in Japanese waters. Off Chiba and Ibaraki prefectures, we showed movies of acoustic distribution of fish, crustacean and cetaceans using 20 passive acoustic monitoring stations. In Tateyama Bay, Chiba prefecture, combined methods of passive and active means visualized benthic and pelagic species simultaneously. Kushiro-Tokachi cable system, off Hokkaido showed seasonal presence of fin whales that has never been identified due to rough weather in winter time. Achieved sound data during 20 years revealed frequent presence of sperm whales in Sagami bay, off Kanagawa prefecture. Using support vector machine, deep learning and neural networks, classification of broadband echoes from fish was improved to monitor individual moment and identify species. Even in a limited area, species maps of marine animals have been presented. Acoustic remote sensing technology will be used for the census of aquatic animals.