Researcher Database

NAIZHENG YAN
School of Fisheries Sciences
Specially Appointed Assistant Professor

Researcher Profile and Settings

Affiliation

  • School of Fisheries Sciences

Job Title

  • Specially Appointed Assistant Professor

ORCID ID

J-Global ID

Research Interests

  • 無鰾魚   魚種判別   ソウハチ   スケトウダラ   音響資源調査   広帯域計量魚群探知機   計量魚群探知機   target strength   

Research Areas

  • Life sciences / Aquaculture
  • Environmental science/Agricultural science / Environmental dynamics

Academic & Professional Experience

  • 2020/10 - Today Hokkaido University Faculty of Fisheries Sciences

Education

  • 2017/10 - 2020/09  Hokkaido University  Graduate School of Fisheries Sciences  Division of Marine Bioresource and Environmental Science
  • 2015/10 - 2017/09  Hokkaido University  Graduate School of Fisheries Sciences  Division of Marine Bioresource and Environmental Science

Association Memberships

  • アメリカ音響学会   海洋音響学会   

Research Activities

Published Papers

  • Kohei Hasegawa, Naizheng Yan, Tohru Mukai
    Journal of Marine Science and Technology 29 (2) 135 - 145 1023-2796 2021/05/21 [Refereed]
     
    Measurements of the broadband acoustic backscattering from fish should improve acoustic discrimination between species. The pulse compression processing of broadband systems can be used tomeasure acoustic backscattering with high range resolution and improve signal-to-noise ratio. This may increase opportunities for in situ target strength (TS) measurements, the preferredmethod 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 frombackscattering 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-frequencymethod, which uses two or more single frequencies. The rawTS spectra should aid in not only discriminating between species but also estimating the size of the fish.
  • Naizheng Yan, Tohru Mukai, Jun Yamamoto, Kohei Hasegawa
    Fisheries Research 224 105434 - 105434 0165-7836 2020/04 [Refereed]

Conference Activities & Talks

  • 自由遊泳法によるソウハチとホッケの広帯域ターゲットストレングス測定
    閻 乃筝, 向井 徹, 長谷川 浩平, 福田 美亮, 山本 潤
    海洋音響学会2022年度研究発表会  2022/05
  • Naizheng Yan, Tohru Mukai, Kohei Hasegawa, Jun Yamamoto, Yoshiaki Fukuda
    The Fourteenth Annual Meeting of Asian Fisheries Acoustics Society( AFAS2021)  2021/11  Bogor, Indonesia(Online)  IPB University, Bogor Indonesia
  • 体形の異なる無鰾魚の広帯域ターゲットストレングス特性
    海洋音響学会2021年度研究発表会  2021/05
  • 体形状の異なる無鰾魚の音響散乱特性の検討
    令和2年度日本水産学会春季大会  2020/03
  • Acoustic characteristics of three bladderless fishes
    178th Meeting of the Acoustical Society of America  2019/12
  • 懸垂法による無鰾魚の広帯域ターゲットストレングス測定
    海洋音響学会2019年度研究発表会  2019/05
  • Study on acoustic characteristics of pointhead flounder and juvenile walleye pollock
    176th Meeting of the Acoustical Society of America  2018/11
  • Broadband target strength measurements of pointhead flounder, a flatfish without a swim bladder
    The 12th Annual Meeting of Asian Fisheries Acoustic Society  2018/11
  • 海水水槽におけるソウハチのsemi-in situターゲットストレングス測定と遊泳姿勢の観察
    海洋音響学会2018年度研究発表会  2018/05
  • Acoustics distinction between pointhead flounder and juvenile walleye pollock by echo shape and frequency characteristics
    OCEANS’18 MTS/IEEE Kobe / Techno-Ocean 2018  2018/05
  • ソウハチの音響散乱特性に関する研究 ―II.広帯域音響システムによるソウハチのターゲットストレングス測定―
    超音波研究会  2018/05
  • 無鰾魚であるソウハチのin situターゲットストレングス測定
    平成30年度日本水産学会春季大会  2018/03
  • Acoustics distinction between pointhead flounder and juvenile walleye pollock using a quantitative echo-sounder in and near Funka Bay, Hokkaido, Japan
    The 11th Annual Meeting of Asian Fisheries Acoustic Society  2017/11
  • 計量魚群探知機を用いた噴火湾周辺海域におけるソウハチとスケトウダラ稚魚の調査‐ソウハチのターゲットストレングス測定‐
    平成29年度日本水産学会春季大会  2017/03
  • Studies on pointhead flounder and juvenile walleye pollock using a quantitative echo-sounder in and near Funka Bay, Hokkaido, Japan
    The international conference on underwater acoustics for sustainable fisheries in Aisa  2016/11
  • 1. 計量魚群探知機を用いた噴火湾周辺海域におけるソウハチとスケトウダラ稚魚の調査‐エコーグラムにおける特徴‐
    平成28年度日本水産学会北海道‐東北合同支部大会  2016/10

Works

MISC

  • 自由遊泳法によるソウハチとホッケの広帯域ターゲットストレングス測定
    閻 乃筝, 向井 徹, 長谷川 浩平, 福田 美亮, 山本 潤  2022/05
  • 体形の異なる無鰾魚の広帯域ターゲットストレングス特性
    閻乃筝, 向井徹, 長谷川浩平, 山本潤, 福田美亮  海洋音響学会2021年度研究発表会講演論文集  2021/05
  • 川添祐斗, 長谷川浩平, 福田美亮, 閻乃筝, 向井徹, 山口浩志, 守田航大  日本水産学会大会講演要旨集(CD-ROM)  2021-  2021
  • 斉書豪, 福田美亮, 長谷川浩平, 閻乃筝, 向井徹  日本水産学会大会講演要旨集(CD-ROM)  2021-  2021
  • 池田大典, 長谷川浩平, 向井徹, 福田美亮, YAN Naizheng  海洋音響学会研究発表会講演論文集  2021-  2021
  • 藤貫雅礼, 向井徹, 長谷川浩平, 福田美亮, 閻乃筝  日本水産学会大会講演要旨集(CD-ROM)  2021-  2021
  • 懸垂法による無鰾魚の広帯域ターゲットストレングス測定
    閻 乃筝, 向井 徹, 長谷川浩平, 山本 潤, 工藤尚之  海洋音響学会2018年度研究発表会講演論文集  65  -66  2019/05
  • 閻 乃筝, 向井 徹, 山本 潤, 工藤 尚之, 長谷川 浩平  IEICE technical report  118-  (199)  33  -36  2018/08
  • Study on acoustic scattering characteristics of pointhead flounder Cleisthenes pinetorum : Characteristics of pointhead flounder observed with a quantitative echosounder
    向井 徹, 閻 乃筝, 山本 潤, 長谷川 浩平  IEICE technical report  118-  (199)  29  -32  2018/08
  • 海水水槽におけるソウハチのsemi-in situターゲットストレングス測定と遊泳姿勢の観察
    閻 乃筝, 向井 徹, 山本 潤, 高原英生  海洋音響学会2018年度研究発表会講演論文集  49  -52  2018/05
  • Naizheng Yan, Tohru Mukai, Jun Yamamoto  2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO)  2018/05  
    This study addresses the methods for distinguishing the pointhead flounder Cleisthenes pinetorum from the juvenile walleye pollock Gadus chalcogrammus in and near Funka Bay, Hokkaido, Japan. Acoustics data of th Gadus chalcogrammus e fish were monitored using a Simrad EK60 (38, 120, 200 kHz) split-beam echo sounder, and biological samples were collected using a rod for the pointhead flounder and a frame-type midwater trawl for the juvenile walleye pollock. The pointhead flounder schools presented a patch shaped echo on the echograms and showed strong scattering at all three frequencies, whereas the distribution patterns of the juvenile walleye pollock schools were layered. The volume backscattering strength (SV) of the target schools extracted from the echograms showed that the pointhead flounder presented a higher SV at high frequency, which is consistent with the early surveys of other bladderless fish. In contrast, the juvenile walleye pollock showed higher SV at low frequency, which also agreed with the early surveys.

Awards & Honors

  • 2021/11 Asian Fisheries Acoustics Society Young Fisheries Acoustician Award
     Broadband Target Strength Measurements of Three Bladderless Fishes
  • 2021/03 北海道大学 北海道大学大塚賞
  • 2021/03 北海道大学大学院水産科学院 ジョンカッター賞

Research Grants & Projects

  • 公益財団法人日本科学協会:笹川科学助成
    Date (from‐to) : 2019/04 -2020/02
  • 計量魚群探知機を用いた北海道噴火湾周辺海域におけるソウハチとスケトウダラ稚魚の音響判別
    公益財団法人日本科学協会:笹川科学助成
    Date (from‐to) : 2018/04 -2019/02


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