YAN NAIZHENG

School of Fisheries SciencesSpecially Appointed Assistant Professor
Last Updated :2025/01/11

■Researcher basic information

Degree

  • Sep. 2020

Researchmap personal page

Research Keyword

  • Japanese flying squid
  • Sonar
  • 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
  • target strength

Research Field

  • Life sciences, Aquaculture
  • Environmental science/Agricultural science, Environmental dynamics, 海洋資源調査

■Career

Career

  • Aug. 2022 - Present
    Hokkaido University, School of Fisheries Sciences, 特任助教
  • Oct. 2020 - Jul. 2022
    Hokkaido University, Faculty of Fisheries Sciences, 特任助教

Educational Background

  • Oct. 2017 - Sep. 2020, Hokkaido University, Graduate School of Fisheries Sciences, Division of Marine Bioresource and Environmental Science, 博士課程後期
  • Oct. 2015 - Sep. 2017, Hokkaido University, Graduate School of Fisheries Sciences, Division of Marine Bioresource and Environmental Science

■Research activity information

Awards

  • Nov. 2024, Asian Fisheries Acoustics Society, Young Fisheries Acoustician Award               
    Broadband target strength of Japanese flying squid(Todarodes pacificus)
  • Nov. 2022, Asian Fisheries Acoustics Society, Young Fisheries Acoustician Award
    Broadband target strength measurements of juvenile walleye pollock
    International society, Korea, Republic of, 40685659
  • Nov. 2021, Asian Fisheries Acoustics Society, Young Fisheries Acoustician Award
    Broadband Target Strength Measurements of Three Bladderless Fishes
    International society, 35769213
  • Mar. 2021, 北海道大学, 北海道大学大塚賞               
  • Mar. 2021, 北海道大学大学院水産科学院, ジョンカッター賞               

Papers

  • Impact of anticyclonic eddy on fish distribution in the Kuroshio‒Oyashio transition area
    土橋 稜, 上野 洋路, 加藤 陸, 閻 乃筝, 向井 徹, 安間 洋樹, 野村 大樹, 伊藤 幸彦, 笠井 亮秀
    水産海洋研究, 88, 3, 178, 189, Aug. 2024, [Peer-reviewed]
    Japanese, Scientific journal
  • Broadband target strength of arabesque greenling, Pacific sand lance, and pointhead flounder
    Naizheng Yan, Tohru Mukai, Kohei Hasegawa, Jun Yamamoto, Yoshiaki Fukuda
    ICES Journal of Marine Science, 22 Jan. 2024, [Peer-reviewed], [Lead author, Corresponding author]
    Scientific journal
  • 計量ソナーに用いるマサバのターゲットストレングスの計測と理論モデル解析               
    閻 乃筝, 向井 徹, 長谷川浩平, 飯田浩二, 鶴田直剛
    海洋音響学会誌, 50, 4, 107, 122, Oct. 2023, [Peer-reviewed], [Lead author, Corresponding author]
    Japanese, Scientific journal
  • In situ broadband acoustic measurements of age-0 walleye pollock and pointhead flounder in Funka Bay, Hokkaido, Japan
    Kohei Hasegawa, Naizheng Yan, Tohru Mukai
    Journal of Marine Science and Technology, 29, 2, 135, 145, National Taiwan Ocean University, 21 May 2021, [Peer-reviewed], [International Magazine]
    Scientific journal, 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.
  • Acoustic discrimination between juvenile walleye pollock and pointhead flounder
    Naizheng Yan, Tohru Mukai, Jun Yamamoto, Kohei Hasegawa
    Fisheries Research, 224, 105434, 105434, Elsevier BV, Apr. 2020, [Peer-reviewed], [Lead author], [International Magazine]
    Scientific journal

Other Activities and Achievements

Lectures, oral presentations, etc.

  • スルメイカの広帯域ターゲットストレングス               
    閻乃筝, 向井徹, 長谷川浩平, 工藤尚之, 大西由利子, 笠井昭範, 西山義浩, 山本潤
    海洋音響学会2024年度研究発表会, 13 Jun. 2024
  • 計量ソナーに用いるマサバの3次元ターゲットストレングス               
    閻乃筝, 向井徹, 長谷川浩平, 飯田浩二, 鶴田直剛
    日本水産学会春季大会, 28 Mar. 2024
  • Target strength of Jesogammarus annandalei, an endemic amphipod in Lake Biwa               
    Naizheng Yan, Tohru Mukai, Kouichi Sawada, Kanako Ishikawa
    The Sixteenth Annual Meeting of Asian Fisheries Acoustics Society, 14 Nov. 2023, English, Oral presentation
  • スケトウダラ稚魚の 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
    海洋音響学会2023年度研究発表会, 25 May 2023
  • スケトウダラ稚魚のターゲットストレングスの体長依存性および周波数特性               
    閻 乃筝, 向井 徹, 長谷川浩平, 山本 潤
    令和5年度日本水産学会春季大会, 29 Mar. 2023
  • Broadband target strength measurements of juvenile walleye pollock
    Naizheng YAN, Tohru MUKAI, Kohei HASEGAWA, Jun YAMAMOTO
    The Fifteenth Annual Meeting of Asian Fisheries Acoustics Society, 15 Nov. 2022, English, Oral presentation
    14 Nov. 2022 - 16 Nov. 2022, 40685659
  • 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, 26 May 2022, Oral presentation
  • Broadband target strength measurements of three bladderless fishes
    Naizheng Yan, Tohru Mukai, Kohei Hasegawa, Jun Yamamoto, Yoshiaki Fukuda
    The Fourteenth Annual Meeting of Asian Fisheries Acoustics Society( AFAS2021), 01 Nov. 2021, IPB University, Bogor Indonesia, English, Oral presentation
    01 Nov. 2021 - 02 Nov. 2021, Bogor, Indonesia(Online), Indonesia, 35769213, [International presentation]
  • 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, May 2021, Oral presentation
  • 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, Mar. 2020, Oral presentation
  • Acoustic characteristics of three bladderless fishes               
    178th Meeting of the Acoustical Society of America, Dec. 2019
  • 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, May 2019
  • Study on acoustic characteristics of pointhead flounder and juvenile walleye pollock               
    176th Meeting of the Acoustical Society of America, Nov. 2018, Oral presentation
  • Broadband target strength measurements of pointhead flounder, a flatfish without a swim bladder               
    The 12th Annual Meeting of Asian Fisheries Acoustic Society, Nov. 2018, Oral presentation
  • 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, May 2018, Oral presentation
  • Acoustics distinction between pointhead flounder and juvenile walleye pollock by echo shape and frequency characteristics               
    OCEANS’18 MTS/IEEE Kobe / Techno-Ocean 2018, May 2018, Poster presentation
  • 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, May 2018, Oral presentation
  • 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, Mar. 2018, Oral presentation
  • 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, Nov. 2017, Oral presentation
  • 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, Mar. 2017, Oral presentation
  • 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, Nov. 2016, Poster presentation
  • 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, Oct. 2016, Oral presentation

Affiliated academic society

  • アメリカ音響学会               
  • 海洋音響学会               

Research Themes