Researcher Profile and Settings

Affiliation

• Faculty of Fisheries Sciences　Marine Bioresource and Environmental Science　Fisheries Engineering

Job Title

• Professor

Degree

• Ph. D（The University of Tokyo）

Research funding number

• 50517331

J-Global ID

• 201301060132331581

Research Interests

• 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 Areas

• Life sciences / Aquaculture

Educational Organization

•  Bachelor's degree program　School of Fisheries Sciences
•  Master's degree program　Graduate School of Fisheries Sciences
•  Doctoral (PhD) degree program　Graduate School of Fisheries Sciences

Academic & Professional Experience

• 2023/04 - Today 北海道大学大学院水産科学研究院 教授
• 2011/04 - 2023/03 北海道大学大学院水産科学研究院 准教授
• 2010/04 - 2011/03 Kyoto Prefectural Agriculture Forestry and Fisheries Technology Center, Fisheries Technology Department
• 2004/05 - 2010/03 Hokkaido University Field Science Center for Northern Biosphere

Education

• 1999/04 - 2004/03  The University of Tokyo
• 1994/04 - 1998/03  Nihon University

Association Memberships

• 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 Activities

Published Papers

• 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 0144-8609 2023/11 [Refereed]
  
• 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 0001-4966 2023/03 [Refereed]
   

  The sound properties produced by the white-edged rockfish (Sebastes taczanowskii Steindachner, 1880) were compared with the body size. We conducted a tank experiment to compare the sound properties with body length, which ranged from 12.4 to 19.8 cm. Sound production was composed of pulses with a duration of 0.010-0.022 s and a peak frequency of 400-1000 Hz. Peak frequency decreased with fish and swim bladder size and pulse duration. The relationship between sound properties and body size may be useful for estimating the body length of the target species by using passive acoustic monitoring.
• 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 2022/09/29 [Refereed]
   

  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.
• 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 0916-5835 2022/07 [Refereed]
  
• 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 [Refereed]
  
• 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 0919-9268 2022/01 [Refereed]
  
• 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 0919-9268 2021/05 [Refereed]
  
• 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 0919-9268 2020/07 [Refereed][Not invited]
  
• 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 0025-3324 2018/07 [Refereed][Not invited]
   

  AbstractA recent study revealed that fat greenling Hexagrammos otakii produces call sounds during the spawning season; the number of fish calls increases on the spawning day. However, it is unknown where and how many individual fat greenling produce fish calls. This behavior of fat greenling could be estimated by localizing the fish calls. We propose a sound localization method that uses two stereo recorders, which can then be used to estimate two time differences of arrival for each fish call. First, the calls of fat greenling are recorded by two stereo recorders for 3 weeks during the spawning season. Second, the calls of fat greenling are detected from the recorded data by the automatic detection algorithm, which uses the acoustic features of the fish call, and the positions of fish calls are estimated by the proposed sound localization method. The analysis of the recorded data by using the proposed method localized most of the fish calls near the spawning bed. Furthermore, the number of calling individuals may be estimated by analyzing the relation between the time the fish call is produced and its localized position.
• 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 1755-1315 2018/04/12 [Refereed][Not invited]
   

  One of the required information for sustainable fisheries management is about the habitat characteristics of a fish species. This information can be used to map the distribution of fish and map the potential fishing ground. This study aimed to analyze the habitat characteristics of small pelagic fishes (anchovy, squid, sardine and scads) which were mainly caught by lift net in Kepulauan Seribu waters. Research on habitat characteristics had been widely done, but the use of total suspended solid (TSS) parameters in this analysis is still lacking. TSS parameter which was extracted from Landsat 8 along with five other oceanographic parameters, CPUE data and location of fishing ground data from lift net fisheries in Kepulauan Seribu were included in this analysis. This analysis used Generalized Additive Models (GAMs) to evaluate the relationship between CPUE and oceanographic parameters. The results of the analysis showed that each fish species had different habitat characteristics. TSS and sea surface height had a great influence on the value of CPUE from each species. All the oceanographic parameters affected the CPUE of each species. This study demonstrated the effective use of GAMs to identify the essential habitat of a fish species.
• 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 特定非営利活動法人 海洋音響学会 45 (2) 37‐46 - 46 0916-5835 2018/04 [Refereed][Not invited]
   

  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 2187-9265 2018 [Refereed][Not invited]
  
• 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  0916-7617 2017/11 [Refereed][Not invited]
  
• 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 2087-9423 2017/06 [Refereed][Not invited]
   

  Information on the spatial and temporal of fishing activity can optimize a fisheries management and increase their economical and biological benefit. For effective management and good understanding of fishing activities, information about fishing ground is crucial. In this study, we aimed to analyze the spatio-temporal of lift net fisheries in Kepulauan Seribu by analyzing their fishing season, investigating their hotspot of fishing ground using GIS-based hotspot model, and mapping the potential fishing ground of each target species. We found that anchovy and scad could be caught throughtout the year, while sardine and squid had high fishing season in west monsoon. Hotspot of fishing ground of lift net fisheries in Kepulauan Seribu waters generally was concentrated around Lancang Island and in southern part of Kotok Island. Potential fishing ground for sardines was located in around Lancang Island on west monsoon. Squids were highly distributed around Lancang Island in December to January and around Lancang and Rambut Islands in November. Anchovy and scad had more potential fishing ground in around Kepulauan Seribu waters.
• 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 0001-4966 2016/10
• 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 0001-4966 2016/10
• 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 [Refereed][Not invited]
   

  Some fish species have features producing sounds, that is, fish calls. Recently, these sounds have been used in order to discriminate species and observe the behavior of fish. As one of these studies, the relationship between the fish calls and the behavior about fat greenling (Hexagrammos otakii) were investigated. As a result, fat greenling produced sounds in spawning season. However, the relation between fish calls and spawning behavior is still unknown. As a way of knowing the behavior of fish, it was considered to localize fish calls. It is known that the arrival direction of each fish call can be estimated by using a stereo-recorder. However, the localization cannot be done by only a stereo-recorder. In our study, two stereo-recorders are used for the sound localization. By using two stereo-recorders, two arrival directions of each fish call can be estimated. Therefore, the sound localization can be implemented by using two arrival directions.
• 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 0916-5835 2015/01 [Refereed][Not invited]
  
• 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 日本水産工学会 51 (2) 93 - 103 0916-7617 2014/11 [Refereed][Not invited]
   

  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 日本水産工学会 51 (2) 133 - 137 0916-7617 2014/11 [Refereed][Not invited]
   

  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 0919-9268 2014/05 [Refereed][Not invited]
   

  In the Shiretoko Peninsula, a World Natural Heritage site, the sustainable management of kelp forests has drawn public attention because of the economic and ecological importance of kelp. We spatially estimated the distributions of kelp forests in the Shiretoko Peninsula before and after harvest. Field surveys were conducted in coastal waters (23.74 km(2)) at the ends of July and August 2008, immediately before and after harvest. Data on the presence or absence and thickness of the kelp forests were collected via acoustic observation. The data were interpolated using geostatistical methods. Before harvest, the kelp forests were continuously distributed over 5.64 km(2) (thickness 33-132 cm), especially near the north part of the study area. After harvest, they were sparsely distributed over 2.73 km(2) (thickness 35-105 cm). In the southern part of the study area, the influence of harvests was observed as declines in forest area. In addition, relatively thickly forested areas formed the majority of the part most likely to be harvested. Selective harvesting for area and size was confirmed though quantitative mapping of kelp forests. The quantitative mapping of both the distribution and harvest of kelp forests was successful.
• 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 The Japanese Society of Fisheries Engineering 49 (3) 167 - 175 0916-7617 2013/02 [Refereed][Not invited]
   

  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 1023-2796 2013 [Refereed][Not invited]
   

  Egg abundance of Maurolicus japonicus, a dominant mesopelagic fish in the Japan Sea, was analyzed during 1981-2005 as an index of the spawning-adult abundance. There was a major change in egg abundance around 1988/1989, with negative anomalies occurring during 1981-1988 and positive anomalies occurring from l989. At about the same time (1986/1987), the Tsushima Current shifted from cold to warm conditions. Environmental indices were found to be positively correlated with egg abundance two years later. Our results suggest that the abundance of M. japonicus is affected by climatic regime shifts, and that it could be used as an indicator species.
• 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 1349-998X 2013 [Refereed][Not invited]
   

  The purpose of this study was to clarify the acoustic scattering properties of juvenile jack mackerel Trachurus japonicus, based on theoretical calculations and target strength (TS) measurements for determining the optimum frequency with which to estimate the biomass using a scientific echosounder. The theoretical TS of the juvenile jack mackerel was estimated using a scattering model (PSM) based on the morphometry of the swim-bladder. The fork length (L) ranged from 7.5 to 12.9 cm (26 specimens). These theoretical TS values corresponded with ex situ measurement results of the TS. The normalized max. TScm and mean TScm, i.e. The TS normalized by the square of body length (L, cm), at each frequency corresponding to those commonly used for acoustic surveys (18, 38, 50, 70, 120, and 200 kHz), ranged from - 66.2 to - 68.4 dB, and - 68.7 to - 69.9 dB, respectively. In addition, these TS differences between pairs of frequencies (ranging from 18 kHz to 200 kHz) within the tilt angle distributions having a mean of 0° and standard deviation of 15° were relatively small.
• 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 [Refereed][Not invited]
  
• 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 [Refereed][Not invited]
  
• 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 公益社団法人 日本水産学会 78 (2) 171 - 179 0021-5392 2012/03 [Refereed][Not invited]
   

  Sargassum beds play important ecological roles as nursery grounds, feeding grounds and hiding grounds for coastal fauna in Kuruminose, Yamaguchi, Japan (12 km(2)). In this study, we tried to estimate the spatial distribution of a Sargassum bed using an acoustic method. For this purpose, binarization and geostatistical methods were used. The binarization provided the optimum thresholds to separate the bottom and head of the Sargassum bed. The bottom threshold and the head threshold were -22.4 dB, and -56.4 dB, respectively. The horizontal distribution was interpolated every 1 m(2) using kriging. The area of the Sargassum bed was estimated to be 1.94 km(2), with thickness of 0.50 to 2.24 m. The Sargassum bed in the south-southeast of Kuruminose was thicker and larger than that near Kuruminose, suggesting that the south-southeast Sargassum bed is important for the coastal ecosystem in Kuruminose. The estimated thickness and distribution corresponded with those by direct observation by diving and underwater TV camera, suggesting that acoustic measurement is adequate for estimating the spatial distribution of Sargassum beds.
• 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 Japan Institute of Navigation 126 (126) 237 - 243 0388-7405 2012/03 [Refereed][Not invited]
   

  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 公益社団法人 日本航海学会 126 (126) 277 - 282 0388-7405 2012/03 [Refereed][Not invited]
   

  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 数理水産科学研究会 9 85 - 94 1348-6802 2011/12 [Refereed][Not invited]
  
• 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 数理水産科学研究会 9 62 - 74 1348-6802 2011/12 [Refereed][Not invited]
  
• 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 数理水産科学研究会 9 75 - 84 1348-6802 2011/12 [Refereed][Not invited]
  
• Acoustic biomass estimates of mesopelagic fishes in the western North Pacific

  Hiroki Yasuma

  NIPPON SUISAN GAKKAISHI 公益社団法人 日本水産学会 77 (4) 585 - 588 0021-5392 2011/07 [Refereed][Invited]
   

  中深層性魚類マイクロネクトン(以下，中深層性魚類)は，海洋の中深層(200～1000m)に生息し，主にハダカイワシ科，ヨコエソ科，ムネエソ科，ワニトカゲギス科などで構成される。これらの多くは体長10センチ程度の小型魚であるが，外洋における音響散乱層の主要な構成要素であり，膨大な生物量を有すると考えられている。また，多くの魚種が大規模な日周鉛直移動を行い，表層と中深層の物質循環において重要な役割を果たしている。外洋の生態系構造を理解するうえで，これらの定量情報は非常に重要であるといえるが，動物プランクトンなどに比べ高い逃避能力を持つ中深層性魚類を正確に定量評価できる採集具は今のところ存在しない。このような現状において，中深層性魚類の定量化に最も期待されているのが，計量魚群探知機(以下，計量魚探)を用いる音響学的手法の適用である。音響調査では，計量魚探で得られたエコーデータを尾数や重量に変換するためのスケールファクタとして，生物1個体の反射強度であるターゲットストレングス(TS)が必要となる。中深層性魚類は生息深度が深いためTSの直接計測が困難であり，現状では，ひょう形状を基にした理論散乱モデルによる推定が有効的であると考えられている。このような背景のもと，著者らは中深層性魚類のひょう形態の観察とTS推定を行ってきた。本稿では，北太平洋における代表的な中深層性魚類であるハダカイワシ科魚類を例に，研究の概要を説明する。また，音響調査に適用された例として，北日本海域で最も優占的な魚種であるトドハダカの生物量推定を示す。
• 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 1023-2796 2011/06 [Refereed][Not invited]
   

  We examined the vertical distributions of walleye pollock Theragra chaleogramma juveniles for two size groups (smaller and larger than 30 mm) during the period of transition for feeding (PTF) and after this period in Funka Bay, Hokkaido, Japan. Samplings were conducted in May and June in 2006 and 2007, and water temperature and salinity were measured. The correlation between juvenile sizes and distributed depth was observed using net sampling. From this result, size groups were divided by depth. In addition, the distribution and abundance of juveniles were examined using acoustic data. In the PTF (May), juvenile size increased with increasing depth, and after the PTF (June), most juveniles descended. In the PTF, juveniles smaller than 30 mm in TL dominated above 43 m depth in 2006, while juveniles larger than 30 mm in TL dominated below 18 m depth in 2007. After the PTF, juvenile sizes were larger in 2006 than in 2007. The relationships between juvenile distributions and water masses in the PTF were analyzed, and it was found that surface water of coastal Oyashio water (S-CO) dominated in the layers where small juveniles were distributed, and that Oyashio water (OW) dominated in the layers where large juveniles were distributed.
• 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 0919-9268 2011/03 [Refereed][Not invited]
   

  The swimming angle of larval Japanese anchovy (Engraulis japonicus) was measured in a tank, and target strength (TS) was calculated using a theoretical scattering model. The mean swimming angle was 12.8A degrees (SD +/- 22.1). Increased speeds of flow led to increased mean swimming angles. The mean swimming angle at flow of 5 cm s(-1) was higher than at other speeds. TS values were estimated using a distorted-wave Born approximation model for two cases. Average values were 1-3 cm s(-1) (11.5A degrees A A +/- A 22.1) and 5 cm s(-1) (16.6A degrees A A +/- A 21.7) for cases 1 and 2, respectively. For case 1, TS ranged from -92.0 to -74.7 dB with a mean of -79.4 dB at 120 kHz. For case 2, TS ranged from -92.2 to -75.2 dB with a mean of -79.9 dB. The mean TS in case 2 was lower than that in case 1, with the maximum difference being 1.0 dB at 120 kHz (standard length 22.0 mm). However, there were no significant differences between the regression lines of cases 1 and 2. Thus, changes in flow speed altered the swimming angle of larval Japanese anchovy, but had little influence on TS.
• 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 0919-9268 2010/09 [Refereed][Not invited]
   

  Sustainable management of the kelp forests of the Shiretoko Peninsula, a World Natural Heritage site, is necessary due to kelp's ecological and economic importance. The objectives of this study were to estimate the area of kelp forests and to clarify their spatial characteristics in coastal waters of the Shiretoko Peninsula. Data on the presence/absence and thickness of kelp forests were collected via acoustic observation on transects over about 80 km using an echosounder at 200 kHz. Acoustic data were geostatistically interpolated, and the areas covered by kelp forests were estimated. Differences in kelp distribution between the eastern and western sides of the peninsula were compared. The total area of kelp forest was 3.88 km(2) (eastern area: 3.49 km(2); western area: 0.39 km(2)). The range of thickness of the kelp forests was 34-91 cm. Many kelp forests in the eastern area were thick (>78 cm) and distributed continuously, while kelp forests in the western area were sparsely distributed.
• 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 The Marine Acoustics Society of Japan 37 (3) 147 - 155 0916-5835 2010/07 [Refereed][Not invited]
   

  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 日本水産學會 76 (3) 362 - 369 0021-5392 2010/05 [Refereed][Not invited]
   

  California headlightfish Diaphus theta is the most abundant mesopelagic fish in the subarctic Pacific. Day- and nighttime field acoustic data and biological samples were obtained in January 2000, in the Pacific area off eastern Hokkaido to estimate fish density and total biomass of D. theta. Sound scattering layers composed mainly of immature D. theta (63 mm length on average) were widely distributed around the shelf edge (> 300 m water depth). Relatively dense schools were observed below the depth of 250 m during the daytime, although the schools were scattered widely above 50 m depth during the nighttime. Fish density was estimated to be 17.3 g/m(2) on average, which was more than several times higher than that estimated by conventional methods such as net sampling gears. Total biomass in the survey area (2,083 km(2)) was estimated to be about 35,900 t.
• 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 水産海洋学会 74 (1) 1 - 12 0916-1562 2010/02 [Refereed][Not invited]
   

  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 1054-3139 2010/01 [Refereed][Not invited]
   

  Yasuma, H., Sawada, K., Takao, Y., Miyashita, K., and Aoki, I. 2010. Swimbladder condition and target strength of myctophid fish in the temperate zone of the Northwest Pacific. - ICES Journal of Marine Science, 67: 135-144.
• 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 [Refereed][Not invited]
  
• 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 The Ecological Society of Japan 59 (3) 239 - 247 0021-5007 2009/11 [Refereed][Not invited]
   

  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 0919-9268 2009/11 [Refereed][Not invited]
   

  The mass density and sound-speed contrasts against surrounding seawater (g and h, respectively) of Neocalanus copepods (N. cristatus and N. plumchrus) were measured in 2006 and 2007 to compute the theoretical target strength (TS). The values of g ranged from 0.997 to 1.009 in N. cristatus and from 0.995 to 1.009 in N. plumchrus. There were no correlations between prosome length (PL) and g. The values of h ranged from 1.006 to 1.021 in N. cristatus and from 1.013 to 1.025 in N. plumchrus and varied with changes in temperature. TS was estimated with the theoretical sound scattering model using the values of g and h based on the temperature, salinity, and depth of the location where the specimens were collected. Regressions of the tilt-averaged TS versus PL were obtained at 38, 120, and 200 kHz. The averaged TS of N. cristatus and N. plumchrus at 120 kHz, which is widely used as a high frequency, ranged from -110.0 to -103.1 dB and from -121.4 to -109.7 dB, respectively. There was a positive correlation between frequency and averaged TS: the higher the frequency, the higher the value of averaged TS. The TS at 120 and 38 kHz varied from 14.8 to 16.4 dB in N. cristatus and from 17.9 to 18.7 dB in N. plumchrus, respectively; that at 200 and 120 kHz varied from 2.9 to 5.5 dB in N. cristatus and from 5.3 to 6.5 dB in N. plumchrus, respectively.
• 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 0919-9268 2009/05 [Refereed][Not invited]
   

  Sound-speed and density contrasts (h and g, respectively), important acoustic material properties, of Japanese sandeel Ammodytes personatus were measured to estimate theoretical target strength (TS). The measured sound-speed contrast of adult fish varied between 1.016 and 1.023 (mean 1.020), and showed temperature dependence. The measured density contrast differed significantly between juvenile and adult. The density contrast of juvenile varied between 1.017 and 1.024 (1.021), and that of adult varied between 1.026 and 1.038 (1.032). Using these results, TS at 38 and 120 kHz in the fishing season were estimated by an empirical sound scattering model. TS of an individual fish varied significantly with change of tilt angle. TS of near-dorsal aspect (TS(max)) and tilt-averaged TS (TS(ave)) differed by up to 7 dB. At both frequencies, two different TS(ave)-length relationships (TS(ave) = a log L + b) were obtained for adult and juvenile. The coefficients of log L of adult were close to 20, suggesting that backscattering strength was proportional to square of body length. These values were larger in juvenile (34.0 at 120 kHz, 56.5 at 38 kHz), suggesting that backscattering strength varied drastically with the cube or fifth power of body length.
• 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 海洋音響学会 36 (4) 241 - 249 0916-5835 2009 [Refereed][Not invited]
  
• 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 1054-6006 2009 [Refereed][Not invited]
   

  The acoustic characteristics of biological backscattering in the western North Pacific were studied to verify expert knowledge on species composition in the echosigns. The survey was conducted in the Kuroshio-Oyashio inter-frontal zone and the subarctic waters in April 2003. The species composition of backscatterings was identified by using midwater trawl, Isaacs-Kidd midwater trawl and Bongo net. The differences of mean volume backscattering strengths between 120 and 38 kHz (Delta MVBS(120-38)) were calculated for the backscatterings. Six types of backscatterings were classified based on the results of net samples and the Delta MVBS(120-38). The Delta MVBS(120-38) of each group was as follows: copepods 13.7-17.3 dB, krill 11.6-15.3 dB, Japanese anchovy -1.6 to 1.1 dB, a myctophid, Diaphus theta-0.8 dB, sand lance 6.1 dB and larvae and juveniles of pelagic and mesopelagic fish -9.6 to -4.0 dB. The results suggest that biological backscatterings in the Kuroshio-Oyashio inter-frontal zone and subarctic waters of the western North Pacific in spring can be characterized by using Delta MVBS.
• 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 水産海洋学会 72 (3) 165 - 173 0388-9149 2008/08 [Refereed][Not invited]
  
• 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 [Refereed][Not invited]
  
• Swimbladder morphology and target strength of myctophid fishes in the northwestern Pacific

  YASUMA H

  The Journal of the Marine Acoustics Society of Japan 海洋音響学会 35 (1) 17 - 28 0916-5835 2008/01 [Refereed][Not invited]
  
• 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 1054-3139 2006/05 [Refereed][Not invited]
   

  This paper reports theoretical values of target strength (TS) for the lanternfish Stenobrachius leucopsarus, a fish without an airbladder, which dominates the Subarctic marine mesopelagic fish community. Two models for liquid-like slender bodies, the general prolate-spheroid model (PSM) and the deformed-cylinder model (DCM), were used to compute the TS of the fish relative to its orientation. The relative mass density g and the sound speed h in sea-water were measured and used in both models. To confirm the appropriateness of the models, tethered experimental measurements were carried out at 38 kHz for five specimens. The value of g measured by the density-bottle method was very low (1.002-1.009) compared with that of marine fish in general. The value of h measured by the time-average approach was 1.032-1.039 at the water temperature at which S. leucopsarus is found. TS-fluctuation patterns against fish orientation (the TS pattern) estimated from the DCM and PSM were in good agreement in the area of their main lobes. Both models reproduced the main lobes of the measured TS patterns in near-horizontal orientation (<+/- 20 degrees), and they were considered to be effective in measuring the TS of S. leucopsarus in a horizontal (swimming) position. After these comparative experiments, we computed the TS of 57 fish (27.8-106.9 mm) at 38, 70,120, and 200 kHz, using the DCM. A plot of body length (in log scale) against TS showed a non-linear relationship at all frequencies. S. leucopsarus had a very low TS (<-85 dB, TScm), suggesting that acoustic assessment would be highly sensitive, especially when the proportion of small fish is high (e.g. L/lambda < 2), and an appropriate frequency should be considered that takes into account both the length composition and the depth of occurrence. (c) 2006 International Council for the Exploration of the Sea. Published by Elsevier Ltd. All fights reserved.
• 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 1054-3139 2003/06 [Refereed][Not invited]
   

  This article reports theoretical values of target strength (TS) for mesopelagic lanternfishes based on morphological measurements of their swimbladders. Three species of lanternfishes, Diaphus theta (26.9-77.4 mm standard length (SL)), Symbolophorus californiensis (85.0-108.4 mm SL), and Notoscopelus japonicus (126.0-133.2 mm SL), were examined. After external morphological measurement of the fish body, a specialized "soft X-ray" imaging system was used to map the swimbladders and obtain their morphological parameters. The swimbladder was inflated in D. theta, uninflated in S. californiensis, and was absent in N. japonicus. For D. theta, the swimbladder length does not increase in proportion to the body length, suggesting that the contribution of the swimbladder to acoustic reflection is reduced with growth in this fish. Based on the morphological measurements, the theoretical TS of the fish at 3 8 kHz was calculated using the approximate deformed-cylinder model (DCM) and the general prolate-spheroid model (PSM). For all three species, the calculations showed about 3 dB difference between the TS indicated by the DCM and PSM. Given that the description of body shape is poor in PSM, the DCM results were adopted for fish without a swimbladder or an empty one. The intercept b(20) in the standard formula TS = 20 log SL + b(20) was -85.7 dB (DCM) for S. californiensis and -86.7 dB (DCM) for N. japonicus. On the other hand, the PSM model was adopted for D. theta since its swimbladder has too small an aspect ratio to apply the DCM. For D. theta, the relationship between SL and TS is best expressed by TS = 11.8 log SL - 63.5, which implies that its scattering cross-section is not proportional to the square of the body length. (C) 2003 International Council for the Exploration of the Sea. Published by Elsevier Science Ltd. All rights reserved.
• 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 [Refereed][Not invited]
  

Books etc

• 生き物と音の事典

  安間 洋樹 (Contributor7-12 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 2019/11
• 南極海

  安間 洋樹 (Contributor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 2013/04

MISC

• 中信層性魚類マイクロネクトンの音響生物量推定

  安間洋樹, 髙山のあ, 松倉隆一, 今泉智人, 鈴木勇人  超音波テクノ  35-  (1)  71  -75  2023/02
• Development of a culture tank to improve the survival rate in the early larval stage

  Yuki Takahashi, Hiroki Yasuma, Nobuo Kimura, Genki Kotake  Impact  2020-  (6)  58  -59  2020/11/16  [Not refereed][Not invited]
   

  Aquaculture is a method of producing fish, crustaceans, molluscs, aquatic plants, algae and other organisms in a sustainable manner. As the global population continues to grow, so too has demand and, as a result, many marine species have become severely depleted. Aquaculture is a means of sustainably addressing this demand, replenishing wild stocks and rebuilding populations of endangered species. Assistant Professor Yuki Takahashi, from the Graduate School of Fisheries Sciences at Hokkaido University in Japan, is working as part of a collaborative team of researchers from across academia and industry in Japan to adress this issue of sustainability of demand, by developing an aquaculture tank designed to improve the survival rate in the early larval stage.
• 受動的音響観察によるエゾメバルの生息密度とサイズ組成の推定

  安間洋樹, 藤森康澄, 松原直人, 片倉靖次, 赤松友成  超音波テクノ  32-  (1)  14  -18  2020  [Not refereed][Invited]
  
• Reaction behaviors of fish for LED light with different wavelength

  Y, Tanouchi, Y. Fujimori, S. Shimizu, H. Yasuma, N. Matsumabara, T. Hayashi, S. Katakura  Proceedings of the 34th International Symposium on Okhotsk Sea and Sea Ice  2019/02  [Not refereed][Not invited]
  
• LED光の集魚効果における光色・環境条件の影響

  林拓馬, 松原直人, 藤森康澄, 安間洋樹, 清水晋, 片倉靖次  日本水産学会大会講演要旨集  2019-  2019
• エゾメバルの鳴音の音響特性と体サイズの関係

  松原直人, 林拓馬, 田内葉子, 片倉靖次, 赤松友成, 高橋竜三, 藤森康澄, 木村暢夫, 前川和義, 安間洋樹  日本水産学会大会講演要旨集  2019-  2019
• エゾメバルの鳴音の音響特性と体サイズに伴う変化

  松原直人, 林拓馬, 田内葉子, 片倉靖次, 赤松友成, 高橋竜三, 藤森康澄, 木村暢夫, 前川和義, 安間洋樹  海洋音響学会研究発表会講演論文集  2019-  2019
• NORPACネット網口前の流場にスイベルが与える影響

  城崎亮佑, 井高洋輔, 木村暢夫, 高橋勇樹, 前川和義, 安間洋樹  日本水産工学会学術講演会講演論文集  2018-  79‐80  -80  2018/05/12  [Not refereed][Not invited]
  
• エゾメバル(Sebastes taczanowskii)の鳴音の音響特性,および発生頻度と個体数密度の関係

  松原直人, 坂本誠, 片倉靖次, 赤松友成, 高橋竜三, 藤森康澄, 木村暢夫, 前川和義, 安間洋樹  日本水産学会大会講演要旨集  2018-  164  2018/03/26  [Not refereed][Not invited]
  
• 光色の違いによる集魚効果の比較

  坂本誠, 藤森康澄, 松原直人, 安間洋樹, 清水晋, 片倉靖次  日本水産学会大会講演要旨集  2018-  6  2018/03/26  [Not refereed][Not invited]
  
• LED光源の集魚効果における色・照度,環境条件の影響

  林拓馬, 藤森康澄, 松原直人, 安間洋樹, 片倉靖次  日本水産学会北海道支部大会講演要旨集  2018-  2018
• NORPACネット網口周辺の流場推定

  井高洋輔, 高橋勇樹, 安間洋樹, 木村暢夫  日本水産工学会学術講演会講演論文集  2017-  234‐235  -235  2017/05/27  [Not refereed][Not invited]
  
• LED灯光の特性に違いによる集魚効果の比較

  坂本誠, 松原直人, 安間洋樹, 清水晋, 藤森康澄, 片倉靖次  日本水産学会大会講演要旨集  2017-  6  2017/03/26  [Not refereed][Not invited]
  
• 水産物個人卸売市場(pier)タイ東部ラヨンと南部スラタニーとの比較

  吉村美香, 宮田勉, 安間洋樹, 木村暢夫  日本水産学会大会講演要旨集  2017-  126  2017/03/26  [Not refereed][Not invited]
  
• Future prospects for the Comprehensive Partnership between Faculty of Fisheries Sciences, Hokkaido University and the Mombetsu City

  FUJIMORI Yasuzumi, YASUMA Hiroki, YAMAGUCHI Atsushi, ADACHI Shinji  Proceedings of the International Symposium on Okhotsk Sea & Sea Ice  32nd-  2‐3  2017/02/18  [Not refereed][Not invited]
  
• Sound production by Steindachner (Sebastes taczanowskii); relationship between received sounds and fish density

  MATSUBARA Naoto, SAKAMOTO Makoto, KATAKURA Seiji, AKAMATSU Tomonari, TAKAHASHI Ryuzo, FUJIMORI Yasuzumi, KIMURA Nobuo, MAEKAWA Kazuyoshi, YASUMA Hiroki  Proceedings of the International Symposium on Okhotsk Sea & Sea Ice  32nd-  140‐141  2017/02/18  [Not refereed][Not invited]
  
• Fish Herding Effect of LED Light in Different Specification

  SAKAMOTO Makoto, MATSUBARA Naoto, KATAKURA Seiji, YASUMA Hiroki, SHIMIZU Susumu, FUJIMORI Yasuzumi  Proceedings of the International Symposium on Okhotsk Sea & Sea Ice  32nd-  138‐139  2017/02/18  [Not refereed][Not invited]
  
• Sound production by Steindachner (Sebastes taczanowskii); relationship between sounds and fish density

  N. Matsubara, M. Sakamoto, S. Katakura, T. Akamatsu, R. Takahashi, Y. Fujimori, N. Kimura, K. Maekawa, H. Yasuma  Contributions on the Theory of Fishing Gears and Related Marine Systems  10-  209  -216  2017  [Refereed][Not invited]
  
• Fish attracting effects of LED light of different colours

  M. Sakamoto, Y. Fujimori, N. Matsubara, H. Yasuma, S. Shimizu, S. Katakura  Contributions on the Theory of Fishing Gears and Related Marine Systems  10-  235  -240  2017  [Refereed][Not invited]
  
• The development of an abalone aquaculture system using a multi-tiered, continuous-flow tank

  H. Okita, Z. Luning, S. Yamauchi, H.Yasuma, N. Kimura  Contributions on the Theory of Fishing Gears and Related Marine Systems  10-  189  -198  2017  [Refereed][Not invited]
  
• エゾメバル(Sebastes taczanowskii)の鳴音の音響特性,および鳴音受信頻度と個体密度の関係

  松原直人, 坂本誠, 片倉靖次, 赤松友成, 高橋竜三, 藤森康澄, 木村暢夫, 前川和義, 安間洋樹  日本水産学会北海道支部大会講演要旨集  2016-  47  2016/10/22  [Not refereed][Not invited]
  
• タイ王国の水産資源管理政策

  吉村美香, 安間洋樹, 木村暢夫, 宮田勉  日本水産学会北海道支部大会講演要旨集  2016-  48  2016/10/22  [Not refereed][Not invited]
  
• キツネメバル(Sebastes vulpes)の行動に伴う鳴音の特性

  松原直人, 松田裕太, 高橋竜三, 赤松友成, 宗原弘幸, 木村暢夫, 前川和義, 安間洋樹  日本水産工学会学術講演会講演論文集  2016-  133‐134  -134  2016/04/29  [Not refereed][Not invited]
  
• Characteristics of operations at fish-landing sites managed by private owners in Thailand

  YOSHIMURA Mika, OKAMOTO Junichiro, YASUMA Hiroki, KIMURA Nobuo  北海道大学水産科学研究い報  66-  (1)  51‐58  -58  2016/03/18  [Not refereed][Not invited]
  
• アイナメの産卵期における鳴音の特性

  松原直人, 宗原弘幸, 高橋竜三, 木村暢夫, 前川和義, 安間洋樹  日本水産学会大会講演要旨集  2015-  4  2015/09/22  [Not refereed][Not invited]
  
• Visualization of water flow in fish farming tank by Computational Fluid Dynamics and Particle Image Velocimetry analyses

  G. Kotake, N. Kimura, H. Yasuma, O. Tamaru, Y. Takahashi  Contributions on the Theory of Fishing Gears and Related Marine Systems  9-  311  -318  2015  [Refereed][Not invited]
  
• タイ南部・スラタニー県における水産卸売個人市場の現状

  吉村美香, 宮田勉, 堀美菜, 安間洋樹  日本水産学会大会講演要旨集  2015-  2015
• CFDを用いた飼育水槽内の流れの解析

  小竹 元己, 田丸 修, 高橋 勇樹, 安間 洋樹, 木村 暢夫  日本水産工学会 学術講演会 学術講演論文集  2015-  59  -60  2015
• 練習船を対象とした排煙流のCFD解析

  前川 和義, 松崎 優哉, 亀井 佳彦, 坂岡 佳一郎, 安間 洋樹, 木村 暢夫  日本水産工学会 学術講演会 学術講演論文集  2014-  147  -148  2014
• CFD解析を用いた養殖水槽内の水流特性

  高橋 勇樹, 安間 洋樹, 木村 暢夫, 田丸 修, 大村 智宏, 三好 潤, 永岡 史治, 陸田 秀実  日本水産工学会 学術講演会 学術講演論文集  2014-  89  -90  2014
• アイナメの産卵期における鳴音特性

  松原直人, 宗原弘幸, 赤松友成, 木村暢夫, 前川和義, 安間洋樹  日本水産学会北海道支部大会講演要旨集  2014-  21  2014  [Not refereed][Not invited]
  
• Technique of Work Process Description for Improvement of Caught Fish Handling

  佐伯 公康, 木村 暢夫, 藤森 康澄, 安間 洋樹  Memoirs of the Faculty of Fisheries Sciences, Hokkaido University  55-  (1)  107  -132  2013/12  [Not refereed][Not invited]
   

  In many commercial operations of set net fishery and trawl in Japan, fish catch unloaded from boats are promptly sorted anddisplayed for an auction at a fishing port. This work is achieved with machines and by hand. There have been existed manuallabor and dangerous operations. However, the system of work is so empirical and complicated because of variety of species offish catch and its day-by-day fluctuation. This remarkable feature prevents worksite from improvement. In this study, based onexisting work analysis technique, systematic technique of work process description for improvement of caught fish handling isnewly proposed. Practicality of this technique is proved through the application to two worksites in Japan. Process chart anddescription derived from this technique would contribute to improvement of occupational health and safety at fishing ports.
• 若狭湾における数種の藻場の音響反射特性

  石田太朗, 安間洋樹, 南憲史, 道家章生, 西垣友和, 宮下和士, 藤森康澄  日本水産学会大会講演要旨集  2013-  6  2013/09/19  [Not refereed][Not invited]
  
• ハダカイワシ科魚類と音響生物量推定 (特集 海棲哺乳類の摂餌生態と餌環境)

  安間 洋樹  勇魚  (58)  9  -14  2013/06
• 日本海山陰海域におけるホタルイカとキュウリエソの音響資源調査

  新山史也, 大谷徹也, 西川哲也, 木村暢夫, 前川和義, 安間洋樹  海洋音響学会研究発表会講演論文集  2013-  67  -68  2013/05/20  [Not refereed][Not invited]
  
• 2012年夏季の東シナ海におけるハダカイワシ科魚類2種の音響資源調査

  藤井花, 大下誠二, 安部幸樹, 稲田廉, 安間洋樹  海洋音響学会研究発表会講演論文集  2013-  65  -66  2013/05/20  [Not refereed][Not invited]
  
• 漁船に作用する風圧力の推定について

  千葉誠一朗, 前川和義, 安間洋樹, 木村暢夫  日本水産工学会学術講演会講演論文集  2013-  25  -26  2013  [Not refereed][Not invited]
  
• 計量魚群探知機を用いたガラモ場の現存量推定

  南憲吏, 安間洋樹, 濱野明, 東条斉興, 中村武史, 宮下和士  海洋音響学会研究発表会講演論文集  2012-  1  -2  2012/05/23  [Not refereed][Not invited]
  
• CFD解析を用いた投下型多目的センサーの筐体設計

  櫻井勝也, 鉄村光太郎, 毛内也之, 吉野博之, 村田政隆, 安間洋樹, 前川和義, 木村暢夫  日本水産学会北海道支部大会講演要旨集  2012-  22  2012  [Not refereed][Not invited]
  
• 重回帰分析による道南檜山地区における漁獲物単価の決定要因の抽出

  張敏, 佐々木剛生, 門脇政輝, 藤森康澄, 安間洋樹, 前川和義, 木村暢夫  日本水産学会北海道支部大会講演要旨集  2012-  23  2012  [Not refereed][Not invited]
  
• Estimation of kelp forests thickness using acoustic method

  南憲吏, 安間洋樹, 東条斉興, 伊藤祐介, 福井信一, 野別貴博, 宮下和士  数理水産科学  9-  62  -74  2011/12/25  [Not refereed][Not invited]
  
• 計量魚探による鯨類餌生物のモニタリング

  宮下和士, 松倉隆一, 東条斉興, 南憲吏, 安間洋樹, 永島宏, 小野寺恵一, 渡邉光, 米崎史郎, 村瀬弘人  水産海洋研究  75-  (3)  183  -184  2011/08/01  [Not refereed][Not invited]
  
• Monitoring of prey of cetaceans by using quantitative echosounders

  宮下 和士, 松倉 隆一, 東条 斉興, 南 憲吏, 安間 洋樹, 永島 宏, 小野寺 恵一, 渡邉 光, 米崎 史郎, 村瀬 弘人  水産海洋研究  75-  (3)  183  -184  2011/08/01  [Not refereed][Not invited]
  
• The effects of environmental factors on the Japanese sandeel(Ammodytes personatus) abundance and distribution in the northern coast of Hokkaido

  SAFRUDDIN, ITO YUSUKE, YASUMA HIROKI, ITAYA KAZUHIKO, MAEDA KEIJI, MIYASHITA KAZUSHI  日本水産学会北海道支部大会講演要旨集  2011-  54  2011  [Not refereed][Not invited]
  
• Acoustic biomass estimate of mesopelagic fishes

  安間 洋樹  The Journal of the Marine Acoustics Society of Japan  37-  (2)  106  -110  2010/04  [Not refereed][Not invited]
  
• Distribution patterns and biomass of euphausiids estimated by acoustic methods in the Ross Sea, Antarctica

  安間 洋樹, 松倉 隆一, 高尾 芳三  水産海洋研究  74-  (1)  40  -41  2010/02/01  [Not refereed][Not invited]
  
• Distribution of seabirds in the Ross Sea, Antarctica

  國分 亙彦, 安間 洋樹, 村瀬 弘人, 永延 幹男  水産海洋研究  74-  (1)  42  -43  2010/02/01  [Not refereed][Not invited]
  
• Tracing the seasonal migration of adult Sakhalin taimen, Hucho perryi, using acoustic telemetry.

  本多健太郎, 野田裕二, 津田裕一, 安間洋樹, 宮下和士  日本生態学会誌  59-  (3)  239  -247  2009/11/30  [Not refereed][Not invited]
   

  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.
• ICES水産音響シンポジウム・SEAFACTS 2008に参加して(水産研究のフロントから)

  安間 洋樹  日本水産学会誌  74-  (5)  949  -949  2008/09/15  [Not refereed][Not invited]
  
• Distribution patterns and biomasses of Antarctic krill (Euphausia superba) and ice krill (E. crystallorophias) with note on distribution of Antarctic minke whales (Balaenoptera bonaerensis) in the Ross Sea in 2005

  Hiroto Murase, Hiroki Yasuma, Ryuichi Matsukura, Yoshimi Takao, Kenji Taki, Tomonari Hayashi, Takashi Yabuki, Tsutomu Tamura, Kenji Konishi, Koji Matsuoka, Kazushi Miyashita, Shigetoshi Nishiwaki, Mikio Naganobu  2008CCAMLR-EMM report  1  -14  2008  [Not refereed][Not invited]
  
• 計量魚探機を用いたマイクロネクトンの現存量推定法の開発．

  宮下和士, 安間洋樹  研究成果第461集「海洋生物資源の変動要因の解明と高精度変動予測技術の開発」(農林水産技術会議編)  461-  200  -205  2008  [Not refereed][Not invited]
  
• Regime shift of mesopelagic fish – long term biomass index change of Maurolicus japonicus in the Japan Sea.

  Tadanori Fujino, Kazushi Miyashita, Hiroki Yasuma, Tsuyoshi Shimura, Shinya Masuda, Tuneo Goto  GLOBEC International newsletter  14-  (1)  35  -36  2008  [Not refereed][Not invited]
  
• 音響手法を用いたハダカイワシ科魚類の定量的モニタリング

  安間 洋樹  水産海洋研究  71-  (4)  297  -298  2007/11/08  [Not refereed][Not invited]
  
• 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, 澤田浩一, 高尾芳三, 宮下和士  平成17年度海洋音響学会講演論文集  5  -8  2005  [Not refereed][Not invited]
  
• 6th lCES Symposium on Acoustics in Fisheries and Aquatic Ecology

  安間 洋樹  水産海洋研究  66-  (4)  302  -303  2002/11/30  [Not refereed][Not invited]
  

Awards & Honors

• 2012/03 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
   

  受賞者: 安間洋樹
• 2011/03 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 

  受賞者: 安間洋樹
• 2009/06 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 

  受賞者: 安間洋樹
• 2004/06 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 

  受賞者: 安間洋樹

Research Grants & Projects

• 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

  日本学術振興会：科学研究費助成事業

  Date (from‐to) : 2020/04 -2023/03 

  Author : 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。
• Study on development of rearing tank for improving survival rate of larval stage

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2019/04 -2022/03 

  Author : 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.
• Study on Motion Characteristics of Fisheries Research Vessel and Influences of Actual Sea Conditions to Observation

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2016/10 -2019/03 

  Author : 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.

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