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YASUMA Hiroki

Faculty of Fisheries Sciences　Marine Bioresource and Environmental Science　Fisheries EngineeringProfessor

Researcher basic information

■ Degree
  • Ph. D, The University of Tokyo
■ URL
researchmap URLホームページURL■ Various IDs
Researcher number
  • 50517331
J-Global ID■ Research Keywords and Fields
Research Keyword
  • 沿岸漁場モニタリング
  • 資源量変動
  • 中深層性魚類
  • 音響資源計測
Research Field
  • Life Science, Aquatic bioproduction science, 資源・資源管理 / 水産工学
■ Educational Organization

Career

■ Career
Career
  • Apr. 2023 - Present
    北海道大学大学院水産科学研究院, 教授
  • Apr. 2011 - Mar. 2023
    北海道大学大学院水産科学研究院, 准教授
  • Apr. 2010 - Mar. 2011
    Kyoto Prefectural Agriculture Forestry and Fisheries Technology Center, Fisheries Technology Department, 技師
  • May 2004 - Mar. 2010
    Hokkaido University, Field Science Center for Northern Biosphere, 博士研究員
Educational Background
  • Apr. 1999 - Mar. 2004, The University of Tokyo, 大学院農学生命科学研究科, 水圏生物科学専攻
  • Apr. 1994 - Mar. 1998, Nihon University, 農獣医学部, 水産学科
Committee Memberships
  • Apr. 2021 - Present
    日本水産工学会, 評議員, Society
  • Apr. 2016 - Present
    Fisheries Science 誌 編集委員, Society
  • Apr. 2016 - Present
    日本水産学会誌 編集委員, Society

Research activity information

■ Awards
  • Mar. 2012, 日本大学生物資源科学部, 日本大学生物資源科学部学部長賞
    安間洋樹
  • Mar. 2011, 日本水産学会, 日本水産学会水産学奨励賞
    中深層性魚類マイクロネクトンの音響計測に関する研究
    安間洋樹
  • Jun. 2009, 海洋音響学会, 海洋音響学会論文賞
    北日本海域におけるハダカイワシ科魚類の鰾形態とターゲットストレングス
    安間洋樹
  • Jun. 2004, 海洋音響学会, 優秀論文発表賞
    本邦周辺におけるハダカイワシ科魚類の鰾形態とターゲットストレングス
    安間洋樹
■ Papers
  • Effects of Stocking Density and Tank Tier Position on the Growth of Haliotis discus hannai in a Multi‐Tiered Continuous Flow System and an Evaluation of Economic Efficiency
    Genki Kotake; Tomohiro Masumura; Yuki Takahashi; Shigeki Yamauchi; Nobuo Kimura; Hiroki Yasuma
    Aquaculture Research, 2026, 1, Wiley, Jan. 2026
    Scientific journal, The performance of a multi‐tiered continuous‐flow system (MTCFS) used to cultivate Haliotis discus hannai was evaluated in an industrial‐scale facility, focusing on growth, water quality, and cost–revenue analyses. The system was composed of 10 inclined tiers, allowing efficient solid waste removal via hydraulic forces, and was tested with abalone measuring 20.8 ± 1.4 mm. Growth at stocking densities of 133–1022 individuals m −2 was evaluated over 495 days. The daily shell length increment (DSI) ranged from 36.4 to 53.0 μm day −1 and the daily growth rate (DGR) ranged from 15.1 to 28.7 mg day −1 . The survival rate ranged from 81.6% to 88.0% and remained high even under high‐density conditions. A tank tier position experiment was conducted for 945 days, with abalone evenly arranged in single‐cell units. The DSI was 42.1 μm day −1 in the first tier and 31.3 μm day −1 in the tenth tier. Free ammonia nitrogen (FAN) levels remained below the 5% maximal effective concentration (EC 5 ) of 0.041 mg L −1 in all tiers. In the lower tier, dissolved oxygen (DO) decreased, resulting in periods where the EC 5 threshold (7.36 mg L −1 ) for growth reduction was undershot. Furthermore, comparing DSI, DGR and DO saturation on days 660 and 945 revealed a positive correlation between DO saturation trends and growth. Construction and labour costs accounted for 60.6% of the total aquaculture costs, with electricity costs stable at 12.0% in the industrial‐scale facility. In the profitability analysis for an industrial‐scale operation scenario (100 MTCFS units, three labourers and compound feed), assuming cultivation from 20.8 mm to the harvest size of 60.0 mm, a stocking density of 927.10 individuals m −2 was shown to balance revenue with the costs incurred during the cultivation period. Overall, although growth performance in the MTCFS was partly constrained by reduced DO in the lower tiers, the system was shown to be an effective system for industrial‐scale aquaculture production.
  • 黒潮親潮混合域における高気圧性渦が魚類分布に与える影響
    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]
    Scientific journal
  • 懸垂実験によるクロメEcklonia kuromeの藻体重量と音響反射強度の関係
    安間 洋樹,藤森 康澄,石田 太郎,南 憲吏
    海洋音響学会誌, 51, 2, 23, 30, Apr. 2024, [Peer-reviewed], [Lead author]
    Scientific journal
  • A machine learning ensemble approach for predicting growth of abalone reared in land-based aquaculture in Hokkaido, Japan
    Nguyen Minh Khiem; Yuki Takahashi; Tomohiro Masumura; Genki Kotake; Hiroki Yasuma; Nobuo Kimura
    Aquacultural Engineering, 103, 102372, 102372, Elsevier BV, Nov. 2023, [Peer-reviewed]
    Scientific journal
  • Sound properties produced by white-edged rockfish (Sebastes taczanowskii) in relation to body and swim bladder size
    Naoto Matsubara; Seiji Katakura; Ryuzo Takahashi; Tomonari Akamatsu; Hiroki Yasuma
    JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 153, 3, 1703, 1709, Mar. 2023, [Peer-reviewed], [Last author]
    English, Scientific journal
  • A novel machine learning approach to predict the export price of seafood products based on competitive information: The case of the export of Vietnamese shrimp to the US market
    Nguyen Minh Khiem; Yuki Takahashi; Hiroki Yasuma; Khuu Thi Phuong Dong; Tran Ngoc Hai; Nobuo Kimura
    PLOS ONE, 17, 9, e0275290, e0275290, Public Library of Science (PLoS), 29 Sep. 2022, [Peer-reviewed]
    Scientific journal, Predicting the export price of shrimp is important for Vietnam’s fisheries. It not only promotes product quality but also helps policy makers determine strategies to develop the national shrimp industry. Competition in global markets is considered to be an important factor, one that significantly influences price. In this study, we predicted trends in the export price of Vietnamese shrimp based on competitive information from six leading exporters (China, India, Indonesia, Thailand, Ecuador, and Chile) who, alongside Vietnam, also export shrimp to the US. The prediction was based on a dataset collected from the US Department of Agriculture (USDA), the Food and Agriculture Organization of the United Nations (FAO), and the World Trade Organization (WTO) (May-1995 to May-2019) that included price, required farming certificates, and disease outbreak data. A super learner technique, which combined 10 single algorithms, was used to make predictions in selected base periods (3, 6, 9, and 12 months). It was found that the super learner obtained results in all base periods that were more accurate and stable than any candidate algorithms. The impacts of variables in the predictive model were interpreted by a SHapley Additive exPlanations (SHAP) analysis to determine their influence on the price of Vietnamese exports. The price of Indian, Thai, and Chinese exports highlighted the advantages of being a World Trade Organization member and the disadvantages of the prevalence of shrimp disease in Vietnam, which has had a significant impact on the Vietnamese shrimp export price.
  • Properties of Fish Sound by White-edged Rockfish (<i>Sebastes taczanowskii</i>)
    Naoto MATSUBARA; Rey SAITO; Tomonari AKAMATSU; Ryuzo TAKAHASHI; Hiroki YASUMA
    The Journal of the Marine Acoustics Society of Japan, 49, 3, 96, 102, The Marine Acoustics Society of Japan, 01 Jul. 2022
    Scientific journal
  • エゾメバル(Sebastes taczanowskii)の嗚音の音響特性—Properties of Fish Sound by White-edged Rockfish (Sebastes taczanowskii)
    松原 直人; 齋藤 伶; 赤松 友成; 高橋 竜三; 安間 洋樹
    海洋音響学会誌 = The journal of the Marine Acoustics Society of Japan, 49, 3, 96, 102, Jul. 2022, [Peer-reviewed], [Last author]
    Japanese
  • In situ observations of fish attraction to light-emitting diodes on an undersea observation deck
    M. Tomiyasu; Y. Tanouchi; Y. Fujimori; M. Kaji; T. Hayashi; N. Matsubara; H. Yasuma; S. Shimizu; S. Katakura
    Journal of Marine Science and Technology-Taiwan, 30, 2, 2022, [Peer-reviewed]
    English, Scientific journal
  • Use of GIS and machine learning to predict disease in shrimp farmed on the east coast of the Mekong Delta, Vietnam
    Nguyen Minh Khiem; Yuki Takahashi; Hiroki Yasuma; Dang Thi Hoang Oanh; Tran Ngoc Hai; Vu Ngoc Ut; Nobuo Kimura
    Fisheries Science, 88, 1, 1, 13, Springer Science and Business Media LLC, Jan. 2022, [Peer-reviewed]
    Scientific journal
  • Predicting the price of Vietnamese shrimp products exported to the US market using machine learning
    Nguyen Minh Khiem; Yuki Takahashi; Khuu Thi Phuong Dong; Hiroki Yasuma; Nobuo Kimura
    Fisheries Science, 87, 3, 411, 423, Springer Science and Business Media LLC, May 2021, [Peer-reviewed]
    Scientific journal
  • The use of machine learning to predict acute hepatopancreatic necrosis disease (AHPND) in shrimp farmed on the east coast of the Mekong Delta of Vietnam
    Nguyen Minh Khiem; Yuki Takahashi; Dang Thi Hoang Oanh; Tran Ngoc Hai; Hiroki Yasuma; Nobuo Kimura
    Fisheries Science, 86, 4, 673, 683, Springer Science and Business Media LLC, Jul. 2020, [Peer-reviewed]
    Scientific journal
  • Call Localization of Fat Greenling Hexagrammos otakii Using Two Stereo Underwater Recorders
    Yarnato Kazuki; Matsuo Ikuo; Takahashi Ryuzo; Matsubara Naoto; Yasuma Hiroki
    MARINE TECHNOLOGY SOCIETY JOURNAL, 52, 4, 129, 138, Jul. 2018, [Peer-reviewed], [Last author]
    Scientific journal
  • Analysis of habitat characteristics of small pelagic fish based on generalized additive models in Kepulauan Seribu Waters
    A. A. Rivai; V. P. Siregar; S. B. Agus; H. Yasuma
    IOP Conference Series: Earth and Environmental Science, 139, 1, 1, 12, Institute of Physics Publishing, 12 Apr. 2018, [Peer-reviewed], [Last author]
    English, International conference proceedings
  • Properties of Fish Sound by Fox Jacopever Sebastes vulpes, and Their Change with Agonistic Behavior
    松原直人; 松田裕太; 赤松友成; 高橋竜三; 宗原弘幸; 安間洋樹
    海洋音響学会誌, 45, 2, 37‐46, 46, The Marine Acoustics Society of Japan, Apr. 2018, [Peer-reviewed], [Last author]
    Japanese, We observed the sound production and properties of fox jacopever (Sebastes vulpes) in a water tank experiment to obtain basic information for the Passive Acoustic Monitoring (PAM). Six pairs of experiments including mature and immature fishes were conducted, and sound properties with and without agonistic behavior were compared. Fox jacopever produced low frequency pulses under 2,000 Hz. Pulse number ranged between 1–77, pulse duration was 0.005–0.220 s, pulse period was 0.001–0.989 s, and peak frequency was 258–490 Hz. These properties were changed by the presence or absence of agonistic behavior. Higher peak frequency over 400 Hz was observed only when a pair included an immature fish. Our results showed the potential use of fish sounds for estimating size and status of territorial behavior in this species by PAM.
  • Characteristics of Operations at Coastal Fish-landing Sites Managed by Private Owners in the Northern Gulf of Thailand
    Mika YOSHIMURA; Tsutomu Miyata; Hiroki YASUMA; Nobuo KIMURA
    Japan International Fisheries Research Society, 17, 1, 1, 15, 2018, [Peer-reviewed]
    Japanese, Scientific journal
  • Visualization of Water Flow in Aquaculture Tank using Computational Fluid Dynamics Analysis.
    Kotake G; Takahashi Y; Yasuma H; Maekawa K; Kimura N
    水産工学, 54, 2, 97‐105, Nov. 2017, [Peer-reviewed]
    Japanese
  • POTENTIAL FISHING GROUND MAPPING BASED ON GIS HOTSPOT MODEL AND TIME SERIES ANALYSIS: A CASE STUDY ON LIFT NET FISHERIES IN SERIBU ISLAND
    Rivai Andi Alamsyah; Siregar Vincentius P; Agus Syamsul B; Yasuma Hiroki
    JURNAL ILMU DAN TEKNOLOGI KELAUTAN TROPIS, 9, 1, 337, 356, Jun. 2017, [Peer-reviewed], [Last author]
    English, Scientific journal
  • Sound localization of fish calls recorded by two stereo-underwater-recorders
    Kazuki Yamato; Ikuo Matsuo; Ryuzo Takahashi; Naoto Matsubara; Hiroki Yasuma
    The Journal of the Acoustical Society of America, 140, 4, 3301, 3301, Acoustical Society of America (ASA), Oct. 2016, [Last author]
    Scientific journal
  • Acoustic property of sound production by fat greenling (Hexagrammos otakii) in spawning season
    Naoto Matsubara; Hiroyuki Munehara; Ryuzo Takahashi; Tomonari Akamatsu; Kazuki Yamato; Ikuo Matsuo; Nobuo Kimura; Kazuyoshi Maekawa; Hiroki Yasuma
    The Journal of the Acoustical Society of America, 140, 4, 3065, 3065, Acoustical Society of America (ASA), Oct. 2016, [Last author]
    Scientific journal
  • Localization Method of Fish by Using Fish Call Sounds Recorded by Two Stereo Underwater Sound Recorders
    Kazuki Yamato; Ikuo Matsuo; Ryuzo Takahashi; Naoto Matsubara; Hiroki Yasuma
    TECHNO-OCEAN 2016: RETURN TO THE OCEANS, 2016, Techno-Ocean, 556, 561, 2016, [Peer-reviewed], [Last author]
    English, International conference proceedings
  • The Estimation of Seasonal Biomass Changes of the Sargassum Bed in Kuruminose, Yamaguchi, Japan, by an Acoustic Method
    南憲吏; 安間洋樹; 濱野明; 中村武史; 村瀬昇; 東条斉興; 宮下和士
    海洋音響学会誌, 42, 1, 1, 10, Jan. 2015, [Peer-reviewed]
    Japanese
  • Evaluation of Occupational Safety on the Handling of Fish Catches in Fishing Ports
    佐伯公康; 木村暢夫; 藤森康澄; 安間洋樹; 久宗周二
    水産工学, 51, 2, 93, 103, The Japanese Society of Fisheries Engineering, Nov. 2014, [Peer-reviewed]
    Japanese, In this paper, based on the analysis of the process and work during the handling of fish catch, a questionnaire on the fatigue and awareness of danger on each work was conducted at two fishing ports. the questionnaire was prepared using SD (Semantic differential) method. As a result, it was shown that carrying heavy box containing fish made workers feel fatigued. The work associated with transporting the catch of fish with the forklift and the work on slippery floor gave rise to dangers.
  • Estimation of the Compression Force in the Lumber Intervertebral Disk During the Transportation of Fish Catch in Fishing Ports
    佐伯公康; 木村暢夫; 藤森康澄; 安間洋樹; 久宗周二
    水産工学, 51, 2, 133, 137, The Japanese Society of Fisheries Engineering, Nov. 2014, [Peer-reviewed]
    Japanese, There are many duties done by hand that are associated with the transportation of fish catch in fishing ports in Japan, and there are concerns with an excessive burden on the lumbar. This paper estimated the compression force in the lumbar intervertebral disk based on the weight carried and the work posture for six cases, and assessed the size of the burden by comparing the force with permissible values. The result of this assessment was that four of the cases exceeded the permissible values.
  • Quantitative mapping of kelp forests (Laminaria spp.) before and after harvest in coastal waters of the Shiretoko Peninsula, Hokkaido, Japan
    Kenji Minami; Naoki Tojo; Hiroki Yasuma; Yusuke Ito; Takahiro Nobetsu; Shin-ichi Fukui; Kazushi Miyashita
    FISHERIES SCIENCE, 80, 3, 405, 413, May 2014, [Peer-reviewed]
    English, Scientific journal
  • Estimation of Dynamic Frequency and Time Characteristics in Ship Motions of an Offshore Trawler
    KIMURA Nobuo; FUJIMORI Yasuzumi; YASUMA Hiroki; MAEKAWA Kazuyoshi
    水産工学, 49, 3, 167, 175, The Japanese Society of Fisheries Engineering, Feb. 2013, [Peer-reviewed]
    English, Scientific journal, To clarify the process that leads to large-angle inclinations or even the capsizing of fishing boats, it is useful to be able to track dynamic changes in ship motions. These motions during fishing operations are not static, they change from moment to moment according to the fishing process, and it is important to understand the characteristics of the motions during each fishing operation process. To this end, in this study we focused on conducting a wavelet analysis to simultaneously estimate the time and frequency characteristics of the motions. We conducted a wavelet analysis of motion data obtained from a 160GT offshore trawler under standard running conditions and during Danish seine trawling. From the result obtained, we were able to accurately estimate motion characteristics as conditions changed during the fishing process. Periodical changes in motion were observed as a result of the resonance between the ship motions and the waves that were encountered.
  • Decadal variation in egg abundance of a mesopelagic fish, maurolicus japonicus, in the japan sea during 1981-2005
    Tadanori Fujino; Tsuneo Goto; Tsuyoshi Shimura; Hiroki Yasuma; Yongjun Tian; Hideaki Kidokoro; Shinya Masuda; Kazushi Miyashita
    Journal of Marine Science and Technology (Taiwan), 21, 1, 58, 62, 2013, [Peer-reviewed]
    English, Scientific journal
  • Acoustic scattering properties of juvenile jack mackerel Trachurus japonicus based on a scattering model and ex situ target strength measurements
    Takeshi Nakamura; Akira Hamano; Koki Abe; Hiroki Yasuma; Kazushi Miyashita
    Nippon Suisan Gakkaishi (Japanese Edition), 79, 3, 345, 354, 2013, [Peer-reviewed]
    Japanese, Scientific journal
  • Tilt Angle and Theoretical Target Strength of the Japanese Sandeel, Ammodytes personatus, Captured on the Northern Coast of Hokkaido
    Safruddin; Yohei Kawauchi; Yusuke Ito; Kenji Minami; Kazuhiro Itaya; Keiji Maeda; Ryuichi Matsukura; Koki Abe; Hiroki Yasuma; Kazushi Miyashita
    The Journal of the Marine Acoustics Society of Japan, 40, 329, 338, 2013, [Peer-reviewed]
  • Spatial estimation of the kelp forests (Laminaria spp.) distributions in coastal waters of Hsatsube Hokkaido, Japan, using acoustic method and geographic information system
    Huamei Shao; Yusuke Ito; Kenji Minami; Hiroki Yasuma; Kasushi Miyashita
    GIS/Spatial Analyses in Fishery and Aquatic Sciences, 5, 133, 150, 2013, [Peer-reviewed]
    English
  • Estimation of the spatial distribution of a Sargassum bed in Kuruminose, Yamaguchi, Japan, using an acoustic method
    Kenji Minami; Akira Hamano; Naoki Tojo; Takeshi Nakamura; Hiroki Yasuma; Kazushi Miyashita
    NIPPON SUISAN GAKKAISHI, 78, 2, 171, 179, Mar. 2012, [Peer-reviewed]
    Japanese, Scientific journal
  • Experimental Study on Influence of Loading Condition on Drifting Motion of Fishing Vessel
    MAEKAWA Kazuyoshi; CHIBA Seiichirou; YASUMA Hiroki; KIMURA Nobuo
    日本航海学会論文集, 126, 126, 237, 243, Japan Institute of Navigation, Mar. 2012, [Peer-reviewed]
    Japanese, It is known that a loading condition of fishing vessel changes frequently with fish catching and fuel oil consumption. This paper describes the study on influence of loading condition on drifting motion of fishing vessel in a regular wave. To investigate the influence, model experiments to measure hydrodynamic forces and wave drift forces acting on a hull in various loading conditions were carried out. Based on the characteristics of the forces, the results of drifting motion test in a regular wave were examined. As the results, it was found that the trim condition of vessel affects drifting motion significantly. Therefore, it is important to consider the trim condition of vessel for the prediction of drifting motion.
  • Wavelet Analysis for Ship Rolling Motion of Purse Seiners in North Sulawesi, Indonesia
    DIEN HEFFRY VEIBERT; YASUMA HIROKI; FUJIMORI YASUZUMI; KIMURA NOBUO
    日本航海学会論文集, 126, 126, 277, 282, Japan Institute of Navigation, Mar. 2012, [Peer-reviewed]
    English, A study of coastal fishing boats (small purse seiners) was made in North Sulawesi province, Indonesia. The goal of this study is to clarify the rolling motion under fishing operation of the small purse seiners. First of all we examined the boat form of the purse seiners and practical conditions of rolling motion under fishing operations. Based on the data, the characteristics such boat's stability and rolling motion under fishing operation were calculated. The results of the analysis are as follows: the boat types were relatively slim around the hulls, and the boats had the round shape under water, and a boat still used by fishermen had extremely poor stability, and the roll angle increased remarkably in stage when the boat crossed the wave direction with hauling process, and results of Wavelet analysis showed that the purse seiners used in North Sulawesi had the same characteristics of rolling motion, and wavelet coefficients became large in hauling process.
  • Design of a new expendable profiler, XMS (Expendable Multiple Sensor)
    HEI HIROKI; YASUMA HIROKI; MAEKAWA KAZUYOSHI; FUJIMORI YASUZUMI; KIMURA NOBUO
    数理水産科学, 9, 85, 94, 数理水産科学研究会, Dec. 2011, [Peer-reviewed]
    English, Scientific journal
  • Estimation of kelp forests thickness using acoustic method
    南 憲吏; 安間 洋樹; 東条 斉興
    数理水産科学, 9, 62, 74, 数理水産科学研究会, Dec. 2011, [Peer-reviewed]
    Japanese, Scientific journal
  • Motive performance of a new type of vertical axis rotor estimated by CFD analysis
    TAKAHASHI YUKI; FUJIMORI YASUZUMI; YASUMA HIROKI; YASUI HAJIME; KIMURA NOBUO
    数理水産科学, 9, 75, 84, 数理水産科学研究会, Dec. 2011, [Peer-reviewed]
    English, Scientific journal
  • Acoustic biomass estimates of mesopelagic fishes in the western North Pacific
    Hiroki Yasuma
    NIPPON SUISAN GAKKAISHI, 77, 4, 585, 588, Jul. 2011, [Peer-reviewed], [Invited]
    Japanese
  • VERTICAL DISTRIBUTION OF WALLEYE POLLOCK JUVENILES BEFORE AND AFTER THE PERIOD OF TRANSITION FOR FEEDING IN FUNKA BAY, HOKKAIDO, JAPAN
    Yohei Kawauchi; Osamu Shida; Hiroya Okumura; Naoki Tojo; Hiroki Yasuma; Kazushi Miyashita
    JOURNAL OF MARINE SCIENCE AND TECHNOLOGY-TAIWAN, 19, 3, 279, 286, Jun. 2011, [Peer-reviewed]
    English, Scientific journal
  • Swimming angle and target strength of larval Japanese anchovy (Engraulis japonicus)
    Yusuke Ito; Hiroki Yasuma; Reiji Masuda; Kenji Minami; Ryuichi Matsukura; Saho Morioka; Kazushi Miyashita
    FISHERIES SCIENCE, 77, 2, 161, 167, Mar. 2011, [Peer-reviewed]
    English, Scientific journal
  • Estimation of kelp forest, Laminaria spp., distributions in coastal waters of the Shiretoko Peninsula, Hokkaido, Japan, using echosounder and geostatistical analysis
    Kenji Minami; Hiroki Yasuma; Naoki Tojo; Shin-ichi Fukui; Yusuke Ito; Takahiro Nobetsu; Kazushi Miyashita
    FISHERIES SCIENCE, 76, 5, 729, 736, Sep. 2010, [Peer-reviewed]
    English, Scientific journal
  • Shape and Target Strength of Vesicles of two Sargassum Species Common to the Coastal Waters of Japan
    MINAMI KENJI; HAMANO AKIRA; NAKAMURA TAKESHI; TAKAO YOSHIMI; YASUMA HIROKI; MIYASHITA KAZUSHI
    海洋音響学会誌, 37, 3, 147, 155, The Marine Acoustics Society of Japan, Jul. 2010, [Peer-reviewed]
    English, Scientific journal, The size of vesicles and amount of gas they contain is a major factor in the acoustic scattering of Sargassum plants. Here we investigate the morphological character of the vesicles and gas, and their theoretical and experimental target strength (TS) for two Sargassum species, Sargassum macrocarpum and S. siliquastrum. Both species are abundant in the coastal waters of Japan. A total of 593 vesicles were measured using a soft X-ray system, and their gas shapes were applied to two theoretical TS models (non-resonance and resonance). Experimental TS were obtained at 70 and 200 kHz using quantitative echo sounders in a freshwater tank. Gas fields were found in 418 vesicles, and the gas radius and external size of the vesicles were linearly related in both species. The theoretical TS of the non-resonance model was similar to the experimental TS of large vesicles (≥4.1 mm at 70 kHz, ≥2.8 mm at 200 kHz), whereas the theoretical TS of the resonance model was similar to the experimental TS of small vesicles (≤3.1 mm at 70 kHz, ≤1.9 mm at 200 kHz). Finally, we estimated TS-size equations according to the gas-size relationships and compared the results.
  • Acoustic biomass estimate of California headlightfish Diaphus theta, off eastern Hokkaido, Japan
    Hiroki Yasuma; Tatsuki Ohshima; Satoshi Honda; Kazushi Miyashita; Ichiro Aoki
    NIPPON SUISAN GAKKAISHI, 76, 3, 362, 369, May 2010, [Peer-reviewed]
    Japanese, Scientific journal
  • Structure of the marine ecosystem of the Ross Sea, Antarctica : overview and synthesis of the results of a Japanese multidisciplinary study by Kaiyo-Maru and JARPA
    NAGANOBU Mikio; MURASE Hiroto; NISHIWAKI Shigetoshi; YASUMA Hiroki; MATSUKURA Ryuichi; TAKAO Yoshimi; TAKI Kenji; HAYASHI Tomonari; WATANABE Yuko; YABUKI Takashi; YODA Yasuo; NOIRI Yoshifumi; KUGA Mariko; YOSHIKAWA Kohei; KOKUBUN Nobuo; IWAMI Tetsuo; ITOH Kiyoshi; GOTO Mutsuo; ISODA Tatsuya; MATSUOKA Koji; TAMURA Tsutomu; FUJISE Yoshihiro
    Bulletin of the Japanese Society of Fisheries Oceanography, 74, 1, 1, 12, 水産海洋学会, Feb. 2010, [Peer-reviewed]
    English, Scientific journal, 2004／05年南半球夏季に南極ロス海域において、特にオキアミと鯨類の関係解明を目的とした、生態系総合調査を実施した。水産庁開洋丸と南極海鯨類捕獲調査（JARPA）船団が共同して調査を行った。（1）海洋観測、（2）RMTによるプランクトンと魚類採集、（3）計量魚探によるオキアミ現存量調査、（4）高次捕食者（鳥類と鯨類）の目視調査、及び（5）クロミンククジラ標本採集の5項目を調査対象とした。多様な生物群集の分布と海洋条件との関係を理解するために、海洋学的指数として表面から200mまでの水温平均値（MTEM-200）を用いた。南北の水温傾度に沿って、プランクトン、魚類、鳥類及び鯨類それぞれの種組成が変化することが明らかとなった。生態系総合調査を通して得られたデータは、未知が多いロス海の海洋生態系の構造を理解するための基礎となる。
  • Swimbladder condition and target strength of myctophid fish in the temperate zone of the Northwest Pacific
    Hiroki Yasuma; Kouichi Sawada; Yoshimi Takao; Kazushi Miyashita; Ichiro Aoki
    ICES JOURNAL OF MARINE SCIENCE, 67, 1, 135, 144, Jan. 2010, [Peer-reviewed]
    English, Scientific journal
  • Spatial analysis of Isada krill (Euphausia pacifica) distribution in frontal environments in the North Pacific Ocean
    Tojo N; Matsukura R; Yasuma H; Yonezaki S; Watanabe H; Miyashita K
    GIS/Spatial analyses in Fishery and Aquatic Sciences, 4, 115, 138, 2010, [Peer-reviewed]
    English
  • Tracing the seasonal migration of adult Sakhalin taimen, Hucho perryi, using acoustic telemetry
    Honda Kentaro; Noda Yuji; Tsuda Yuichi; Yasuma Hiroki; Miyashita Kazushi
    Japanese Journal of Ecology, 59, 3, 239, 247, The Ecological Society of Japan, Nov. 2009, [Peer-reviewed]
    Japanese, Scientific journal, At present, the distribution of endangered Sakhalin taimen, Hucho perryi, in Japan is limited to several rivers and lakes in Hokkaido. Although field studies of adult H. perryi have focused on spawning habits, other ecological information is lacking. Here, we report on field research conducted to elucidate the seasonal migration patterns of adult H. perryi in the Bekanbe-ushi River system in Hokkaido using acoustic telemetry. From early May to late November 2007, we tracked five taimen with acoustic tags using 13 acoustic receivers. We detected the tagged fish a combined total of 37,683 times. The fish migrated an average of 33.4±12.5 (SD) km downstream from their spawning area over 1-4 days. They primarily resided mid-downstream in the spring, upper-downstream in the summer, and downstream in the autumn. Logistic regression analysis revealed that the upward migration by tagged fish living downstream was affected by ambient daily maximum water temperatures in the summer, whereas spring and autumn downward migrations were facilitated by ambient daily minimum water temperatures in mid-stream areas. These results suggest that the seasonal migration patterns of adult H. perryi are closely associated with the water temperature regimes of this river system.
  • Measurements of density contrast and sound-speed contrast for target strength estimation of Neocalanus copepods (Neocalanus cristatus and Neocalanus plumchrus) in the North Pacific Ocean
    Ryuichi Matsukura; Hiroki Yasuma; Hiroto Murase; Shiroh Yonezaki; Tetsuichiro Funamoto; Satoshi Honda; Kazushi Miyashita
    FISHERIES SCIENCE, 75, 6, 1377, 1387, Nov. 2009, [Peer-reviewed]
    English, Scientific journal
  • Density and sound-speed contrasts, and target strength of Japanese sandeel Ammodytes personatus
    Hiroki Yasuma; Ryo Nakagawa; Takashi Yamakawa; Kazushi Miyashita; Ichiro Aoki
    FISHERIES SCIENCE, 75, 3, 545, 552, May 2009, [Peer-reviewed]
    English, Scientific journal
  • Swimbladder Morphology and Target Strength of a Mesopelagic Fish, Maurolicus japonicus
    Tadanori Fujino; Kazuhiro Sadayasu; Koki Abe; Hideaki Kidokoro; Yongjun Tian; Hiroki Yasuma; Kazushi Miyashita
    The Journal of the Marine Acoustics Society of Japan, 36, 4, 241, 249, 海洋音響学会, 2009, [Peer-reviewed]
    English, Scientific journal
  • Acoustic characterization of biological backscatterings in the Kuroshio-Oyashio inter-frontal zone and subarctic waters of the western North Pacific in spring
    Hiroto Murase; Morio Ichihara; Hiroki Yasuma; Hikaru Watanabe; Shiroh Yonezaki; Hiroshi Nagashima; Shigeyuki Kawahara; Kazushi Miyashita
    FISHERIES OCEANOGRAPHY, 18, 6, 386, 401, 2009, [Peer-reviewed]
    English, Scientific journal
  • Quantitative analysis of isada krill (Euphausia pacifica) distribution in the western North Pacific
    TOJO Naoki; SHIMIZU Daisuke; YASUMA Hiroki; KAWAHARA Shigeyuki; WATANABE Hikaru; YONEZAKI Shirou; MURASE Hiroto; MIYASHITA Kazushi
    Bulletin of the Japanese Society of Fisheries Oceanography, 72, 3, 165, 173, 水産海洋学会, Aug. 2008, [Peer-reviewed]
    Japanese, Scientific journal
  • 北太平洋西部におけるツノナシオキアミの分布特性の空間的定量解析
    東条斉興; 清水大介; 安間洋樹; 川原重幸; 渡辺光; 米崎史郎; 村瀬弘人; 宮下和士
    水産海洋研究, 72, 3, 165, 173, 2008, [Peer-reviewed]
    Scientific journal
  • Swimbladder morphology and target strength of myctophid fishes in the northwestern Pacific
    YASUMA H
    The Journal of the Marine Acoustics Society of Japan, 35, 1, 17, 28, 海洋音響学会, Jan. 2008, [Peer-reviewed]
    Japanese, Scientific journal
  • Target strength of the lanternfish, Stenobrachius leucopsarus (family Myctophidae), a fish without an airbladder, measured in the Bering Sea
    H Yasuma; Y Takao; K Sawada; K Miyashita; Aoki, I
    ICES JOURNAL OF MARINE SCIENCE, 63, 4, 683, 692, May 2006, [Peer-reviewed]
    English, Scientific journal
  • Target strength of mesopelagic lanternfishes (family Myctophidae) based on swimbladder morphology
    H Yasuma; K Sawada; T Olishima; K Miyashita; Aoki, I
    ICES JOURNAL OF MARINE SCIENCE, 60, 3, 584, 591, Jun. 2003, [Peer-reviewed]
    English, Scientific journal
  • Acoustical measurement of the horizontal distribution of isada krill (Euphausia pacifica Hansen) off the Sanriku coast
    Miyashita K; Tetsumura K; Kooka K; Yasuma H; Taki K
    International Symposium ACOUSTGEAR2000, 1, 191, 194, 2001, [Peer-reviewed]
    English, International conference proceedings
■ Other Activities and Achievements
■ Books and other publications
  • 生き物と音の事典
    安間 洋樹, 7-12 摩擦を用いた発音と音響特性、7-13 イセエビの発音器官と音響特性
    朝倉書店, Nov. 2019, [Contributor]
  • 南極海
    安間 洋樹, 第9章，オキアミはいったいどれくらいいるのか？ －音響調査による定量化－
    東海大学出版会, Apr. 2013, [Contributor]
■ Syllabus
  • キャリアマネジメントセミナー, 2024年, 修士課程, 水産科学院
  • ステップアップキャリア形成Ⅰ, 2024年, 修士課程, 水産科学院
  • ステップアップキャリア形成Ⅱ, 2024年, 修士課程, 水産科学院
  • Introduction to Fisheries Sciences Ⅰ（水産科学汎論Ⅰ）, 2024年, 修士課程, 水産科学院
  • 水産工学特論Ⅱ, 2024年, 修士課程, 水産科学院
  • 水産工学特論Ⅰ, 2024年, 修士課程, 水産科学院
  • 大学院共通授業科目（一般科目）：自然科学・応用科学, 2024年, 修士課程, 大学院共通科目
  • 大学院共通授業科目（一般科目）：複合領域, 2024年, 修士課程, 大学院共通科目
  • 大学院共通授業科目（一般科目）：複合領域, 2024年, 修士課程, 大学院共通科目
  • 科学・技術の世界, 2024年, 学士課程, 全学教育
  • 海洋資源科学実験Ⅲ, 2024年, 学士課程, 水産学部
  • 海洋資源科学洋上実習Ⅰ, 2024年, 学士課程, 水産学部
  • 海洋資源科学洋上実習Ⅱ, 2024年, 学士課程, 水産学部
  • 水産科学英語Ⅰ, 2024年, 学士課程, 水産学部
  • 基礎水産資源学, 2024年, 学士課程, 水産学部
  • 水産情報・工学, 2024年, 学士課程, 水産学部
  • 情報解析演習, 2024年, 学士課程, 水産学部
■ Affiliated academic society
  • 数理水産科学会
  • THE JAPANESE SOCIETY OF FISHERS ENGINEERING
  • JAPANESE SOCIETY OF FISHERIES OCEANOGRAPHY
  • THE MARINE ACOUSTICS SOCIETY OF JAPAN
  • THE JAPANESE SOCIETY OF FISHERIES SCIENCE
■ Research Themes
  • 本邦温帯域におけるハダカイワシ類の音響生物量推定法の開発と時空間的分布変動の解明
    科学研究費助成事業
    01 Apr. 2020 - 31 Mar. 2023
    安間 洋樹; 木村 暢夫; 前川 和義; 高橋 勇樹
    ①ハダカイワシ科魚類の鰾形態とターゲットストレングスの推定：2021年度は，三陸沖合～常磐海域において漁獲された優占6魚種において，鰾形状の観察とTS推定を行った。また，音響種判別に資する情報として，太平洋温帯域でハダカイワシ科魚類と同様に優占していたトガリムネエソとホシホウネンエソにおいても，鰾形状の観察を行った。上記2種においては，気体を満たした鰾が確認され，これらが，散乱層の音響反射強度に大きく寄与することが示された。


    ②調査船を用いた生物サンプル，音響データの取得：2021年度は，第五開洋丸，若鷹丸を用いて，北海道沖太平洋，および三陸沖合～常磐沖にかけた音響・生物サンプリングを行った。これらの海域において，マメハダカ，オオクチイワシ，トドハダカがそれぞれ優占する異なる性質のエコーグラムを取得した。


    ③優占種の水平分布，鉛直移動の定量解析：2020年度に得られたTS情報と過去に蓄積した音響データを元に，2014年~2016年の九州南西部海域におけるハダカイワシ科優占2種（ヒロハダカ，及びサガミハダカ）の音響分布推定を行った。調査海域4400 km2における推定生物量は，2014年：サガミハダカ 約19万トン，ヒロハダカ 約3万トン，2015年：サガミハダカ 約86万トン，ヒロハダカ 約10万トン，2016年：サガミハダカ 約35万トン，ヒロハダカ 約2万トンであった。また，サガミハダカは全ての年において調査海域全体に広く分布していたが，ヒロハダカは南西部にはほとんど分布せず，北部および南東部に主として分布していた。
    日本学術振興会, 基盤研究(C), 北海道大学, 20K06200
  • Study on development of rearing tank for improving survival rate of larval stage
    Grants-in-Aid for Scientific Research
    01 Apr. 2019 - 31 Mar. 2022
    Kimura Nobuo
    In this study, we used computational fluid dynamics (CFD) analysis to evaluate and improve the flow field of aquaculture tanks targeting the early juvenile stage. for improving survival rates.First, flow visualization experiment using PIV was conducted on a circular tank to verify the estimation accuracy of CFD analysis. The results confirmed the validity of the CFD simulations.
    Then, CFD analysis was conducted for octagonal and circular tanks with various changes in the placement of airstones, and the flow field was evaluated and airstone placement was proposed by using the range of upwelling to prevent sinking death.For the future's task, rearing experiment using proposed tank should be conducted to confirm the effects of the improvements.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 19K06182
  • Study on Motion Characteristics of Fisheries Research Vessel and Influences of Actual Sea Conditions to Observation
    Grants-in-Aid for Scientific Research
    21 Oct. 2016 - 31 Mar. 2019
    MAEKAWA KAZUYOSHI
    Fisheries research vessels are indispensable to investigations of bio-resources and oceanic environmental information necessary for maintenance of sustainable fisheries activities and resources management.
    In this study, water tank experiments and numerical simulations are carried out to find out characteristics of fisheries research vessel’s motion and influences of hydrodynamic phenomena to observation equipment in expected actual sea conditions.
    From the results, important knowledges are obtained to be considered in order to realize high performance and efficient observation.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 16K07835