HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences >
Peer-reviewed Journal Articles, etc >

In situ Broadband Acoustic Measurements of Age-0 Walleye Pollock and Pointhead Flounder in Funka Bay, Hokkaido, Japan

Files in This Item:

The file(s) associated with this item can be obtained from the following URL: https://doi.org/10.51400/2709-6998.1076


Title: In situ Broadband Acoustic Measurements of Age-0 Walleye Pollock and Pointhead Flounder in Funka Bay, Hokkaido, Japan
Authors: Hasegawa, Kohei Browse this author
Yan, Naizheng Browse this author
Mukai, Tohru Browse this author
Keywords: Broadband echosounder
Target strength
Acoustic discrimination
Issue Date: 22-Sep-2021
Publisher: National Taiwan Ocean University
Journal Title: Journal of marine science and technology
Volume: 29
Issue: 2
Start Page: 135
End Page: 145
Publisher DOI: 10.51400/2709-6998.1076
Abstract: Measurements of the broadband acoustic backscattering from fish should improve acoustic discrimination between species. The pulse compression processing of broadband systems can be used to measure acoustic backscattering with high range resolution and improve signal-to-noise ratio. This may increase opportunities for in situ target strength (TS) measurements, the preferred method of collecting TS data. To evaluate the availability of TS spectra for acoustic discrimination, three Simrad EK80 wideband transceivers and split-beam transducers of 70, 120, and 200 kHz were used to collect in situ frequency responses of TS from age-0 juvenile walleye pollock and pointhead flounder, a swim-bladderless flat-fish, distributed in and around Funka Bay, Hokkaido, Japan. The single echoes were extracted from backscattering data, and the TS spectra of the two species were obtained. However, processing of the broadband acoustic data is under discussion. To ensure the reliability of our data, the TS spectra of standard targets were also calculated. The measured TS spectra of the standard targets were close to the theoretical TS spectra. The individual TS spectra of two species included complex frequency response; however, the mean TS spectrum was relatively stable. The different characteristics of the frequency responses observed for the two species were in good agreement with reported observations. The results available for the acoustic discrimination were similar to the multi-frequency method, which uses two or more single frequencies. The raw TS spectra should aid in not only discriminating between species but also estimating the size of the fish.
Type: article
URI: http://hdl.handle.net/2115/82701
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 

 - Hokkaido University