Researcher basic information

• 博士（環境科学）, 北海道大学
• 修士（水産科学）, University of Alaska Fairbanks
• 学士（景観生態学・保全生物学）, University of Idaho
• 学士（文芸）, 近畿大学

• https://researchmap.jp/NTRvn?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201501008116776941

• 201501008116776941

• Applied Ecology
• Sustainability
• Resource Dynamics Analyses and Monitoring
• Fisheries Cooperation
• Fisheries Development

• Environmental Science/Agriculture Science, Conservation of biological resources, Ecosystem Approach/Ecosystem Based Approach
• Life Science, Aquatic bioproduction science, Fisheries Development and Cooperation Practices

• 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

Research activity information

• Feb. 2015, Ministère de l'agriculture et de la pêche maritime, Maroc (Kingdom of MOROCCO), (Special Award for the Cooperative Activities as a Expert in the Fisheries Project)
  Naoki TOJO
• Nov. 2007, North Pacific Marine Science Organization (PICES), FIS Committee Best Presentation Award
  "Marine environment induced spatial dynamics of recruited walleye pollock juveniles (Theragra chalcogramma) and interactions with prey and predators along the Pacific coast of Hokkaido, Japan"
  Naoki TOJO (Authors;Naoki Tojo;Akira Nishmura;Satoshi Honda;Tetsuichiro Funamoto;Seiji Katakura;Kazushi Miyashit

• The effect of farm size on economic efficiency: a case study of Vietnamese pangasius farms
  Huynh Huu Tho; Nguyen Le Hoa Tuyet; Naoki Tojo
  Fisheries Science (online) : https://doi.org/10.1007/s12562-021-01549-y, Sep. 2021, [Peer-reviewed], [Last author]
  English, Scientific journal
• Are Consumers Willing to Pay More for Traceability? Evidence from an Auction Experiment of Vietnamese Pork
  Khuu, Thi; Phuong Dong; Saito, Yoko; Tojo, Naoki; Nguyen, Phuong Duy; Nguyen, Thi Ngoc Hoa; Matsuishi; Takashi Fritz
  International Journal of Food and Agricultural Economics, 7, 2, 127, 140, Apr. 2019, [Peer-reviewed]
  English, Scientific journal
• Genetic population structure of the European anchovy (Engraulis encrasicolus) based on mitochondrial DNA sequences along the Moroccan coast
  Khalil C. OUAZZANI; Touria BENAZZOU; Lina TAZ; Naoki TOJO; Malika CHLAIDA
  AACL Bioflux, 9, 5, 1133, 1143, 2016, [Peer-reviewed]
  English
• Seasonal and size-dependent variability in diet of Scomber colias (Gmelin, 1789) of the Atlantic Coast of the Northwest Africa
  Fatima WAHBI; Naoki TOJO; Azeddine RAMZI; Laila SOMOUE; Khalid MANCHIH; Ahmed ERRHIF
  International Journal of Advanced Research, 3, 12, 485, 497, 2015, [Peer-reviewed]
  English
• 音響反射強度測定による来留見ノ瀬のホンダワラ科藻場の現存量推定と季節変化．
  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, 10, 2015, [Peer-reviewed]
  Japanese, Scientific journal
• Distribution of sei whales (Balaenoptera borealis) in the subarctic-subtropical transition area of the western North Pacific in relation to oceanic fronts
  Hiroto Murase; Takashi Hakamada; Koji Matsuoka; Shigetoshi Nishiwaki; Denzo Inagake; Makoto Okazaki; Naoki Tojo; Toshihide Kitakado
  DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 107, 22, 28, Sep. 2014, [Peer-reviewed]
  English, Scientific journal
• 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, Springer, 2014, [Peer-reviewed]
  English, Scientific journal, 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.
• 音響手法を用いた来留見ノ瀬周辺におけるガラモ場の分布推定
  南 憲吏; 濱野 明; 東条斉興; 中村武史; 安間洋樹; 宮下和士
  日本水産学会誌, 78, 171, 179, Apr. 2012, [Peer-reviewed]
• 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
• 音響手法を用いたコンブ場の高さ計測
  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, 2012, [Peer-reviewed]
  Japanese, Scientific journal
• Spatial estimation of euphausiid abundance of Pacific coast off Hokkaido,Japan in early summer of 2008
  Naoki Tojo; Kenji Minami; Ryuichi Matsukura; Yohei Kawauchi; Tetsuichiro Funamoto; Masayuki Chimura; Akira Nishimura; Kazushi Miyashita
  Journal of Marine Science and Technology, 19, 294, 301, 2011, [Peer-reviewed]
  English, Scientific journal
• Vertical distribution of walleye pollock juvenile before and after the period of transition for feeding in Funka bay, Hokkaido, Japan
  Yohei Kawauchi; Osamu Shida; Yuya Okumura; Naoki Tojo; Hiroki Yasuma; Kazushi Miyashita
  Journal of Marine Science and Technology, 19, 279, 286, 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
  MINAMI Kenji; YASUMA Hiroki; TOJO Naoki; FUKUI Shin-ichi; ITO Yusuke; NOBETSU Takahiro; MIYASHITA Kazushi
  Fisheries Science, 76, 5, 729, 736, Springer Japan, Sep. 2010, [Peer-reviewed]
  English, 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 km2 (eastern area: 3.49 km2; western area: 0.39 km2). 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.
• Age-dependent distribution of juvenile southern bluefin tuna (Thunnus maccoyii) on the continental shelf off southwest Australia determined by acoustic monitoring
  HONDA Kentaro; HOBDAY Alistair J; KAWABE Ryo; TOJO Naoki; FUJIOKA Ko; TAKAO Yoshimi; MIYASHITA Kazushi
  Fisheries Oceanography, 19, 2, 151, 158, 2010, [Peer-reviewed]
  English, Scientific journal
• River environmental factors against seasonal habitat use of adult Sakhalin taimen (Huch perryi) in Bekanbe-ushi river system, Japan
  Kentaro Honda; Haruka Kagiwada; Naoki Tojo; Kazushi Miyashita
  Journal of Fish Biology, 77, 7, 1526, 1541, Blackwell Publishing, 2010, [Peer-reviewed]
  English, Scientific journal, The study identified seasonal habitat use by endangered adult Sakhalin taimen, Hucho perryi and the environmental characteristics of their habitats (water depth, amount of riparian forest, and meandering sinuosity). Fifteen adult H. perryi with acoustic tags were tracked by towing an acoustic receiver with a canoe in the Bekanbeushi River system in eastern Hokkaido Island, Japan during each month from late April to late November 2008. Individuals mainly used midstream (shallower than downstream) habitats in all seasons. These locations were generally characterized by relatively dense riparian forests and high sinuosity, indicating the presence of pools. In spring, individuals used habitats with less riparian forest cover compared to mean value of the river channel. From spring to autumn, adult H. perryi selected limnologically complex habitats with meandering channels. From summer to autumn, individuals selected habitats with more riparian forest cover. The inverse relationship between H. perryi detection and riparian forest area in spring was a result of seasonal defoliation in deciduous riparian forests.
• “Spatial analysis of Isada Krill (Euphausia pacifica) distribution in frontal environments in the North Pacific Ocean”
  Naoki TOJO; Ryuichi MATSUKURA; Hiroki YASUMA; Shiroh YONEZAKI; Hikaru WATANABE; Shigeyuki KAWAHARA; Hiroto MURASE; Kazushi MIYASHITA
  GIS/Spatial analyses in Fishery and Aquatic Science, 4, 115, 118, 2010
  English, International conference proceedings
• “Quantitative analysis of Isada krill (Eupausia pacifica) distribution in the western North Pacific”
  Naoki TOJO; Daisuke SHIMIZU; Hiroki YASUMA; Shigeyuki KAWAHARA; Hikaru WATANABE; Shirou YONEZAKI; Hiroto MURASE; Kazushi MIYASHITA
  Bulletin of the Japanese Society of Fisheries Oceanography, 72, 3, 165, 173, 2008, [Peer-reviewed]
  Japanese, Scientific journal
• Migration dynamics of Pacific herring (Clupea pallasii) and response to spring environmental variability in the southeastern Bering Sea
  Naoki Tojo; Gordon H. Kruse; Fritz C. Funk
  DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY, 54, 23-26, 2832, 2848, 2007, [Peer-reviewed]
  English, Scientific journal

• 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2012年度研究発表会講演論文集, 1, 2, Jun. 2012
• Prey selection of common minke, Bryde's and sei whales in the offshore region of the western North Pacific
  村瀬 弘人; 田村 力; 磯田 辰也; 岡本 亮介; 加藤 秀弘; 米崎 史郎; 渡邉 光; 東条 斉興; 松倉 隆一; 宮下 和士; 木和田 広司; 松岡 耕二; 西脇 茂利; 稲掛 伝三; 岡崎 誠; 岡村 寛; 藤瀬 良弘, 水産海洋研究, 75, 3, 180, 181, 01 Aug. 2011
  Japanese
• 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, 183, 184, 2011
• 北西太平洋沖合域におけるミンククジラ，イワシクジラ，ニタリクジラの餌選択性
  村瀬弘人; 田村力; 磯田辰也; 岡本亮介; 加藤秀弘; 米崎史郎; 渡邉光; 東条斉興; 松倉隆一; 宮下和士; 木和田広司; 松岡耕二; 西脇茂利; 稲掛伝三; 岡崎誠; 岡村寛; 藤瀬良弘, 水産海洋研究, 75, 183, 184, 2011

• 特別実習Ⅰ, 2024年, 学士課程, 水産学部
• Introduction to Fisheries Sciences Ⅱ（水産科学汎論Ⅱ）, 2024年, 修士課程, 水産科学院
• 特別実習Ⅱ, 2024年, 学士課程, 水産学部
• 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
• 地域資源科学, 2024年, 学士課程, 水産学部
• 海洋共生学, 2024年, 学士課程, 水産学部
• 水産科学英語Ⅱ, 2024年, 学士課程, 水産学部
• 海洋保全学, 2024年, 学士課程, 水産学部