Researcher basic information

• Doctor of Science, Hokkaido University
• Master of Science, University of Hawai'i at Manoa
• Bachelor of Science, University of California, Santa Barbara

• https://researchmap.jp/read0062104?lang=en

• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200901067008346734

• 200901067008346734

• Oceanography
• Cephalopod fisheries
• Cephalopod ecology

• Humanities & Social Sciences, Science education
• Life Science, Aquatic life science

• 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

• 2017, Hokkaido University Commendation for Excellent Teaching
  John BOWER
• 2016, Hokkaido University Commendation for Excellent Teaching
  John BOWER
• 2015, Hokkaido University Commendation for Excellent Teaching
  John BOWER
• 2015, Hokkaido University President's Award for Excellence in Education
  John BOWER
• 2012, Hokkaido University Commendation for Excellent Teaching
  John BOWER

• A balanced approach to the potential of octopus aquaculture
  Ian G. Gleadall; Roger Villanueva; Gregory J. Barord; Zoe Doubleday; Felipe Aguado-Giménez; Nobuhiko Akiyama; Eduardo Almansa; Cheryl L. Ames; Alexander Arkhipkin; Otilio Avendaño; Chris Barrett; Giambattista Bello; John R. Bower; Ramiro Braga; Felipe A. Briceño; Paco Bustamante; Claudia Caamal-Monsreal; Miguel Cabanellas-Reboredo; Sergio A. Carrasco; Sheila Castellanos-Martínez; Jesús Cerezo Valverde; Leo Ji-Ho Che; Wen-Sung Chung; Shigeki Dan; Mariana Díaz-Santana-Iturrios; Pedro Domingues; Erica Donlon Durante; Alejandro Escánez; Viviana Espinoza; Ana Farías; Fernando Ángel Fernández-Álvarez; Pedro Ferreiro-Velasco; Graziano Fiorito; Hidetaka Furuya; Pedro Gallardo; Kostas Ganias; Camino Gestal; Alexey V. Golikov; Ángel F. González; Roberto González-Gómez; Jessica Gordon; Angel Guerra; Juergen Guerrero-Kommritz; Karina Hall; Manuel Haimovici; Katsuyuki Hamasaki; Jorge Hernández-Urcera; Jorge Hernández-Velásquez; Noritaka Hirohashi; Kazuki Hirota; Neil Hutchinson; Pamela Imperadore; Yoko Iwata; Maria de Lourdes Jiménez-Badillo; Yoshiki Kato; Oleg N. Katugin; Ryosuke Kimbara; Zdenek Lajbner; Germaine Lau; Unai Markaida; Lorenzo Marquez; M. Virginia Martín; Maite Mascaro; Natalie Moltschaniwskyj; Óscar Monroig; Amalia E. Morales; Ana Moreno; Piedad S. Morillo-Velarde; Jaruwat Nabhitabhata; Manuel Nande; Juan C. Navarro; Goh Nishitani; Harini Nishshanka; Atsushi Ogura; Aurelio Ortega; Nicolás Ortiz; Jaime Otero; Rodrigo Oyanedel; Yumeng Pang; Cristina Pascual; Catalina Perales-Raya; João Manuel Figueiredo Pereira; Cristina Pita; Giovanna Ponte; Anne Marie Power; Delta Putra; Antoni Quetglas; Tiago Repolho; Jean-Paul Robin; Francisco Rocha; Alex Romero; Rui Rosa; Carlos Rosas; Rigoberto Rosas-Luis; Katina Roumbedakis; Álvaro Roura; Rushan M. Sabirov; João B.L. Sales; Sanchez Pilar Sánchez; Noriyosi Sato; Warwick H.H. Sauer; Paul W. Shaw; Shuichi Shigeno; Roxana De Silva-Dávila; Chikatoshi Sugimoto; Yasuo Tsukahara; Iker Uriarte; Maria Valls; Silvina Van der Molen; Inmaculada Varó; Iván Velázquez-Abunader; Diego G. Vilarnau; José C. Xavier; Masa-aki Yoshida; Xiumei Zhang; Jian Zheng; Xiaodong Zheng; Mehmet Arif Zoral
  Marine Policy, 179, 106682, 106682, Elsevier BV, Sep. 2025
  Scientific journal
• First quantitative evidence of territorial behavior in squid near spawning substrates
  Shun Tokioka; Jun Yamamoto; John R. Bower; Hajime Matsui; Satoshi Suzuki; Yasunori Sakurai
  Scientific Reports, 15, 1, Springer Science and Business Media LLC, 08 Aug. 2025, [Peer-reviewed]
  Scientific journal, Abstract
  
  In loliginid squids, solitary large males have been observed near the spawning grounds in several species, but little is known about their reproductive behavior. Here we describe the behavior of spear squid Heterololigo bleekeri in a 300 m³ tank near spawning substrates. Observations were recorded on their proximity to the spawning substrates, agonistic behavior, and mating behavior. In both of two rearing experiments, individual males were observed to remain near the spawning substrates and display more frequent agonistic behavior than the other males, suggesting they formed territories near the substrates. The territorial males did not monopolize the females themselves or mating opportunities, suggesting that the benefits of territorial tactics are related to the complex fertilization patterns of this species. To our knowledge, this is the first report of territorial behavior in a squid using quantitative data.
• Status, Constraints, and Potential of Fishing Reserves for Effective Conservation and Fisheries Management in Mauritius Island
  Vinesh Emrith; Naoki Tojo; John R. Bower; Nadeem Nazurally; Yasuzumi Fujimori; Vibhushan Senedhun
  Handbook of Sustainable Blue Economy, 1, 25, Springer Nature Switzerland, 30 Apr. 2025
  In book
• Genetic diversity and population structure of giant Pacific octopus (Enteroctopus dofleini) based on mitochondrial DNA analyses
  Kishimoto Makoto; Bower John R.; Azuma Noriko
  Plankton and Benthos Research, 20, 1, 36, 45, The Plankton Society of Japan, The Japanese Association of Benthology, 28 Feb. 2025, [Peer-reviewed]
  English, The giant Pacific octopus (Enteroctopus dofleini) is the world’s largest octopus and the most abundant species in coastal waters of the North Pacific. Despite the commercial importance of this species in Japan, studies of its genetic population structure have been limited to the Gulf of Alaska. This study was conducted to clarify the genetic diversity and population structure of the giant Pacific octopus (Enteroctopus dofleini) in Japan and evaluate genetic differences in this species between the northwest Pacific (NWP) and northeast Pacific (NEP) based on analyses of the mitochondrial cytochrome c oxidase subunit I (CO1) and cytochrome b (Cytb) genes. A total of 263 specimens were collected in Japan (NWP) during June 2020–August 2022, and the CO1 and Cytb genes were successfully sequenced and analyzed in 230 and 229 specimens, respectively. Diversity indices were also calculated for the NEP using previously published sequence data, and genetic variance was compared between the NEP and NWP. In Japan, ten CO1 haplotypes and nine Cytb haplotypes were detected, and genetic variation among sites was not significant. Comparisons of genetic diversity between the NWP and NEP were inconclusive, but clear genetic differentiation was found between the two regions. The genetic population structure of E. dofleini has likely been shaped by dispersal during the planktonic paralarval stage and plausibly by changes in climate that occurred during the Last Glacial Maximum.
• Past, present, and future trends in octopus research
  Rui Rosa; Catarina P. Santos; Francisco Borges; Piero Amodio; Michael Amor; John R. Bower; Roy L. Caldwell; Anna Di Cosmo; Melanie Court; Graziano Fiorito; Camino Gestal; Ángel F. González; Ángel Guerra; Roger T. Hanlon; Jennifer K.K. Hofmeister; Christian M. Ibáñez; Yuzuru Ikeda; Pamela Imperadore; Juergen G. Kommritz; Michael Kuba; Karina C. Hall; Zdenek Lajbner; Tatiana S. Leite; Vanessa M. Lopes; Unai Markaida; Natalie A. Moltschaniwskyj; Jaruwat Nabhitabhata; Nicolas Ortiz; Eve Otjacques; Federica Pizzulli; Giovanna Ponte; Gianluca Polese; Francesca Raffini; Carlos Rosas; Álvaro Roura; Eduardo Sampaio; Susumu Segawa; Oleg Simakov; Ignacio Sobrino; Lorena Pia Storero; Janet R. Voight; Becky L. Williams; Xiaodong Zheng; Graham J. Pierce; Roger Villanueva; Ian G. Gleadall
  Octopus Biology and Ecology, 421, 454, Elsevier, 2024
  In book
• Enteroctopus dofleini, Giant Pacific octopus
  John R. Bower; Kyosei Noro; Yasunori Sakurai; David Scheel
  Octopus Biology and Ecology, 369, 395, Elsevier, 2024
• Genetic evidence for multiple mating and mixing of sperm from multiple males in the seminal receptacles of female Japanese flying squid (Todarodes pacificus)
  Ryusei Ohtani; Jun Yamamoto; Takashi Yanagimoto; Kohsuke Adachi; John R Bower; Hidefumi A Fujioka; Miyuki Hirose; Mitsuhiro Nakaya; Satoshi Suzuki; Shun Tokioka
  Journal of Molluscan Studies, 88, 3, Oxford University Press (OUP), 19 Sep. 2022, [Peer-reviewed]
  Scientific journal, ABSTRACT
  
  The genetic diversity of sperm and spermatangia stored by mated Japanese flying squid (Todarodes pacificus) was examined to better understand how this ommastrephid squid mates and stores sperm. Analyses were conducted using spermatangia implanted in the lips of immature squid collected in Tsugaru Strait, northern Japan, in July–August 2019, spermatangia implanted in the lips of mature squid collected in the East China Sea in April 2019, and sperm stored in the seminal receptacles of squid collected off Tosashimizu, Kochi Prefecture, Japan, in February 2019. DNA was extracted, microsatellite loci were amplified using five PCR primers, and allele peaks were analysed. Analysis of the spermatangia confirmed that females in the field mate with multiple males, suggesting that males transfer from 1 to at least 14 spermatangia in each mating. Analysis of the seminal receptacles showed that sperm from multiple males are mixed within individual sperm chambers. Spermatangia were also found implanted in the lips of males, providing evidence of same-sex sexual behaviour. To date, studies of cephalopod mating systems have focused on coastal species, and the results of this study add to our growing knowledge of more oceanic species.
• The ecology, fishery and resource status of giant Pacific octopus (Enteroctopus dofleini) in Japan
  Noro Kyosei; John Bower; Sakurai Yasunori
  月刊海洋, 54, 2, 52, 58, 2022
  Japanese
• Close-up observations on the spawning behavior of a captive Japanese flying squid (Todarodes pacificus)
  Jun Yamamoto; Kohsuke Adachi; John R. Bower; Hajime Matsui; Mitsuhiro Nakaya; Ryusei Ohtani; Pandey Puneeta; Satoshi Suzuki; Shun Tokioka; Dharmamony Vijai; Takashi Yanagimoto; Hae-Kyun Yoo
  Scientific reports, 9, 19739, Dec. 2019, [Peer-reviewed]
  English, Scientific journal
• Internationalization of higher education in fisheries sciences in Vietnam, Thailand and the Philippines: A survey of motivations and priorities
  J.R. Bower; W. Gallardo; S. Jumnongsong
  Bulletin of Fisheries Sciences., Hokkaido University, 65, 2, 117, 124, 北海道大学大学院水産科学研究院, 2015
  English, Research institution, This study presents and discusses the results of a survey of internationalization of higher education in fisheries science at four universities in Vietnam, Thailand and the Philippines. Faculty members were asked about the importance, rationales, benefits and risks of internationalization at their universities. Information was also collected on the importance of foreign-language training, geographic priorities, and obstacles. More than 90% of respondents ranked internationalization either a high or medium priority. At every university, the most important reason to internationalize was to strengthen research and knowledge capacity and production. Key benefits included improved academic quality, and strengthened research and knowledge production. Nearly two-thirds of respondents noted internationalization also has associated risks; the most important were loss of cultural or national identity, and brain drain. The foreign language ranked most important was English. Japan and the ASEAN region ranked consistently high in importance for international collaboration, indicating the importance of intra-Asia collaboration, but efforts should be made to prevent less-developed countries and institutions from being left behind. The most important obstacle to internationalization at all universities was lack of financial support.
• World Squid Fisheries
  Alexander I. Arkhipkin; Paul G. K. Rodhouse; Graham J. Pierce; Warwick Sauer; Mitsuo Sakai; Louise Allcock; Juan Arguelles; John R. Bower; Gladis Castillo; Luca Ceriola; Chih-Shin Chen; Xinjun Chen; Mariana Diaz-Santana; Nicola Downey; Angel F. Gonzalez; Jasmin Granados Amores; Corey P. Green; Angel Guerra; Lisa C. Hendrickson; Christian Ibanez; Kingo Ito; Patrizia Jereb; Yoshiki Kato; Oleg N. Katugin; Mitsuhisa Kawano; Hideaki Kidokoro; Vladimir V. Kulik; Vladimir V. Laptikhovsky; Marek R. Lipinski; Bilin Liu; Luis Mariategui; Wilbert Marin; Ana Medina; Katsuhiro Miki; Kazutaka Miyahara; Natalie Moltschaniwskyj; Hassan Moustahfid; Jaruwat Nabhitabhata; Nobuaki Nanjo; Chingis M. Nigmatullin; Tetsuya Ohtani; Gretta Pecl; J. Angel A. Perez; Uwe Piatkowski; Pirochana Saikliang; Cesar A. Salinas-Zavala; Michael Steer; Yongjun Tian; Yukio Ueta; Dharmamony Vijai; Toshie Wakabayashi; Tadanori Yamaguchi; Carmen Yamashiro; Norio Yamashita; Louis D. Zeidberg
  REVIEWS IN FISHERIES SCIENCE & AQUACULTURE, 23, 2, 92, 252, 2015, [Peer-reviewed]
  English, Scientific journal

  
  Download
• Brooding in a Gonatid Squid off Northern Japan
  John R. Bower; Katsunori Seki; Tsunemi Kubodera; Jun Yamamoto; Takahiro Nobetsu
  BIOLOGICAL BULLETIN, 223, 3, 259, 262, Dec. 2012, [Peer-reviewed]
  English, Scientific journal
• Development impacts of long-term aquaculture training programs conducted in Kenya and Thailand
  J.R. Bower; C. Ngugi
  J. Higher Education and Lifelong Learning, 19, 19, 9, 16, 北海道大学高等教育推進機構, 2012
  English, Scientific journal
• Four suggestions to improve fisheries education programmes in developing countries
  J. R. Bower; G. Ishimura
  AFRICAN JOURNAL OF AQUATIC SCIENCE, 37, 2, 225, 227, 2012, [Peer-reviewed]
  English, Scientific journal
• Four principles to help non-native speakers of English write clearly
  John R. Bower
  FISHERIES OCEANOGRAPHY, 20, 1, 89, 91, 2011, [Peer-reviewed]
  English, Scientific journal
• A note on the occurrence of the vampire squid Vampyroteuthis infernalis Chun off the Pacific coast of Japan, including the first capture off Hokkaido
  John R. Bower; Tsunemi Kubodera; Dhugal J. Lindsay; Naonobu Shiga; Saya Shimura; Fumikazu Sano; Naoto Horii; Tamio Kamiya; Mio Tateyama
  FISHERIES SCIENCE, 72, 2, 446, 448, Apr. 2006, [Peer-reviewed]
  English, Scientific journal
• The red flying squid (Ommastrephes bartramii): A review of recent research and the fishery in Japan
  Bower, JR; T Ichii
  FISHERIES RESEARCH, 76, 1, 39, 55, Oct. 2005, [Peer-reviewed]
  English, Scientific journal
• The diamond squid (Thysanoteuthis rhombus): A review of the fishery and recent research in Japan
  Bower, JR; K Miyahara
  FISHERIES RESEARCH, 73, 1-2, 1, 11, Jun. 2005, [Peer-reviewed]
  English, Scientific journal
• Catch fluctuations of the diamond squid Thysanoteuthis rhombus in the Sea of Japan and models to forecast CPUE based on analysis of environmental factors
  K Miyahara; T Ota; N Kohno; Y Ueta; Bower, JR
  FISHERIES RESEARCH, 72, 1, 71, 79, Apr. 2005, [Peer-reviewed]
  English, Scientific journal
• Diet of the minimal armhook squid (Berryteuthis anonychus) (Cephalopoda : Gonatidae) in the northeast Pacific during spring
  K Uchikawa; Bower, JR; Y Sato; Y Sakurai
  FISHERY BULLETIN, 102, 4, 733, 739, Oct. 2004, [Peer-reviewed]
  English, Scientific journal
• Summer vertical distribution of paralarval gonatid squids in the northeast Pacific
  Bower, JR; S Takagi
  JOURNAL OF PLANKTON RESEARCH, 26, 8, 851, 857, Aug. 2004, [Peer-reviewed]
  English, Scientific journal
• CHEMICAL PROPERTIES OF EGG‐MASS MUCIN COMPLEXES OF THE OMMASTREPHID SQUID TODARODES PACIFICUS
  SHIGERU KIMURA; YUMI HIGUCHI; MASAKI AMINAKA; JOHN R. BOWER; YASUNORI SAKURAI
  Journal of Molluscan Studies, 70, 2, 117, 121, Oxford University Press (OUP), May 2004, [Peer-reviewed]
• Change in feeding ecology and trophic dynamics of Pacific salmon (Oncorhynchus spp.) in the central Gulf of Alaska in relation to climate events
  M Kaeriyama; M Nakamura; R Edpalina; Bower, JR; H Yamaguchi; RV Walker; KW Myers
  FISHERIES OCEANOGRAPHY, 13, 3, 197, 207, May 2004, [Peer-reviewed]
  English, Scientific journal
• Lipid Composition of the Digestive Gland, Mantle and Stomach Fluid of the Gonatid Squid Berryteuthis anonychus
  Kenji Hayashi; John R. Bower
  Journal of Oleo Science, 53, 1, 1, 8, 2004, [Peer-reviewed]
  English, Scientific journal
• Latitudinal gradients in body size and maturation of Berryteuthis anonychus (Cephalopoda : Gonatidae) in the northeast Pacific
  Bower, JR; JM Murphy; Y Sato
  VELIGER, 45, 4, 309, 315, Oct. 2002, [Peer-reviewed]
  English, Scientific journal
• Net mesh retention of Japanese common squid eggs and paralarvae
  J Yamamoto; T Miyoi; Bower, JR; T Goto; Y Nakamura; S Masuda; Y Sakurai
  NIPPON SUISAN GAKKAISHI, 67, 3, 497, 499, May 2001, [Peer-reviewed]
  Japanese, Scientific journal
• Cephalopod paralarvae assemblages in Hawaiian Islands waters
  John R. Bower; Michael P. Seki; Richard E. Young; Keith A. Bigelow; Jed Hirota; Pierre Flament
  Marine Ecology Progress Series, 185, 203, 212, Inter-Research, 20 Aug. 1999, [Peer-reviewed]
  English, Scientific journal
• Transport of the ommastrephid squid Todarodes pacificus under cold-water anesthesia
  John R Bower; Yasunori Sakurai; Jun Yamamoto; Hiroshi Ishii
  Aquaculture, 170, 2, 127, 130, Elsevier BV, Jan. 1999, [Peer-reviewed]
  Abstract We describe a method for transporting live squid, Todarodes pacificus (Cephalopoda: Ommastrephidae), using cold-water anesthesia. Squid were placed individually in 30-l plastic bags with 5 l of 0–1°C seawater and 10–15 l of oxygen gas. Thirteen of 14 anesthetized squid survived 6.5 h transport by car and airplane with no signs of distress or shock. The longest survival under anesthesia was 10 h.
• Distribution of Todarodes pacificus (Cephalopoda : Ommastrephidae) paralarvae near the Kuroshio off southern Kyushu, Japan
  Bower J; Nakamura Y; Mori K; Yamamoto J; Isoda Y; Sakurai Y
  Mar Biol., 135, 99, 106, 1999, [Peer-reviewed]
• Estimated paralarval drift and inferred hatching sites for Ommastrephes bartramii (Cephalopoda: Ommastrephidae) near the Hawaiian Archipelago
  Bower, JR
  FISHERY BULLETIN, 94, 3, 398, 411, Jul. 1996, [Peer-reviewed]
  English, Scientific journal
• Effects of temperature on development and survival of Todarodes pacificus embryos and paralarvae
  Sakurai, Yasunori; Bower, John R.; Nakamura, Yoshikazu; Yamamoto, Satoshi; Watanabe, Kumi
  American Malacological Bulletin, 13, 1-2, 89, 95, 1996, [Peer-reviewed]
  English, Scientific journal
• Laboratory observations on Todarodes pacificus (Cephalopoda: Ommastrephidae) egg masses
  Bower, John R.; Sakurai, Yasunori
  American Malacological Bulletin, 13, 1-2, 65, 71, 1996, [Peer-reviewed]
  English, Scientific journal
• Artificial fertilization and development through hatching in the oceanic squids Ommastrephes bartramii and Sthenoteuthis oualaniensis (Cephalopoda: Ommastrephidae)
  Sakurai, Y.; Young, R.E.; Hirota, J.; Mangold, K.; Vecchione, M.; Clarke, M.R.; Bower, J.
  The Veliger, 38, 3, 185, 191, 03 Jul. 1995, [Peer-reviewed]
  English, Scientific journal

• Preliminary investigation of the relationships between environmental conditions and landings of North Pacific giant octopus(Enteroctopus dofleini) at Minamikayabe, Hokkaido
  Taguchi Akira; Sawamura Masayuki; Bower John R., 67, 2, 17, 24, 10 Aug. 2017
  Relationships between environmental factors and fluctuations in landing of North Pacific giant octopus(Enteroctopus dofleini Wulker, 1910) at Minamikayabe town, Hakodate city, Japan, during 1985-2016 were analyzed using regression analysis. Annual landings ranged between 165 and 403 tons, with an average of 273 tons. The relationship between landings and temperature was significant in 9 of the 24 months examined; 7 of the 9 occurred in catches 3-4 years after the temperature was measured. Rainfall showed no significant relationship with catch amounts. The results of the regression analyses suggest that landings of E. dofleini were related to ocean temperature, especially to temperatures 3-4 years before the landings occurred, presumably during the early part of the life cycle of the landed octopuses., English
• Japan launches a new, state-of-the-art training ship – the Oshoro Maru V
  J.R. Bower, PICES Press, 23, 1, 21, 23, 2015
  English, Others
• JSPS Asia-Africa Science Platform Program: Brief summaryu of first year activities
  Katsutoshi Arai; Junichiro Okamoto; Nobuo Kimura; Yasuaki Takagi; Kunihiko Konno; John Bower; Virgilia Sulit, Fish for the People, 10, 2, 42, 47, 2012
  English, Others
• The Oshoro Maru: a short history of Hokkaido University's workhorse in the North Pacific
  J.R. Bower, PICES Press, 9, 1, 25, 28, 2002
  English
• The Hokusei Maru: 53 years of research in the North Pacific
  J.R. Bower, PICES Press, 10, 2, 25, 28, 2002
  English
• Net mesh retention of Japanese common squid eggs and paralarvae
  Jun Yamamoto; Takako Miyoi; John R. Bower; Tsuneo Goto; Yoshikazu Nakamura; Shinya Masuda; Yasunori Sakurai, Nippon Suisan Gakkaishi (Japanese Edition), 67, 3, 497, 499, 2001
  Nihon Suisan Gakkai, Japanese

• 大学院共通授業科目（教育プログラム）：One program for Global Goals, 2024年, 修士課程, 大学院共通科目
• Introduction to Fisheries Sciences Ⅰ（水産科学汎論Ⅰ）, 2024年, 修士課程, 水産科学院
• Introduction to Fisheries Sciences Ⅱ（水産科学汎論Ⅱ）, 2024年, 修士課程, 水産科学院
• 海洋共生学特論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（教育プログラム）：One program for Global Goals, 2024年, 修士課程, 大学院共通科目
• 大学院共通授業科目（教育プログラム）：One program for Global Goals, 2024年, 修士課程, 大学院共通科目
• 一般教育演習(ﾌﾚｯｼｭﾏﾝｾﾐﾅｰ), 2024年, 学士課程, 全学教育
• 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
• 海洋資源科学実験Ⅱ, 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
• General Education Seminar, 2024年, 学士課程, 総合教育部
• General Education Seminar, 2024年, 学士課程, 現代日本学プログラム課程
• 国際交流Ⅱ, 2024年, 学士課程, 国際本部
• 英語演習, 2024年, 学士課程, 全学教育
• 潜水調査実習, 2024年, 学士課程, 水産学部

• American Association for the Advancement of Science
• 日本水産学会
• The Japanese Society of Fisheries Science

• Development of portfolio fishing theory and policy to build resilience in Japanese multispecies fisheries
  Grants-in-Aid for Scientific Research
  18 Jul. 2018 - 31 Mar. 2023
  石村 学志; J・R Bower; 大元 鈴子; 江幡 恵吾; 金岩 稔; 岩田 繁英
  2021年度は本研究プロジェクト目的である(1)漁業ポートフォリオ解析により多魚種漁獲が資源・魚価変動に対して漁業の経営安定化・レジリアンス構築に寄与すること、またこうした結果から(2)日本独自の多魚種漁獲漁業のポートフォリオ漁業設立条件を確立をめざした。さらに、こうした結果をわかりやすく、漁業者や関係者に提示することでコロナ禍の行動制限により困難にあるデータ収集と解析へのさらなる協力を得ることで、本研究プロジェクトの推進をおこなった。
  (1)漁業ポートフォリオ解析により多魚種漁獲が資源・魚価変動に対して漁業の経営安定化・レジリアンス構築に寄与
  日本の伝統的な多魚種漁獲漁業である定置網漁業を太平洋・日本海と海洋環境の異なる事例で漁業ポートフォリオ分析を行った。こうした事例では定置網漁業の多魚種漁獲魚種組成が大きく数年単位で変化してゆくことが明らかとなった。こうした魚種変遷・交替がある多魚種漁獲漁業では、少数主要魚種漁獲のみのポートフォリオと全漁獲魚種で構成するポートフォリオでは後者のポートフォリオの方がリターン(漁獲高)に対するリスク(変動)が低く、多魚種への分散漁獲を行うことでリスクを軽減し、経営安定化を導くポートフォリオ効果が高いことが示された。
  (2) 日本独自の多魚種漁獲漁業のポートフォリオ漁業設立条件
  2019年からの水産政策改革では魚種・系群ごとの漁獲可能量拡大と漁獲割当の導入により特定魚種の漁獲及び水揚制限が行われてゆく。こうした条件をもとに、シミュレーションを行うことで、こうした特定魚種・系群漁獲制限により定置網漁業などの選択制の低い多魚種漁獲漁業の経営安定を阻害されることが示された。こうした理由から、多魚種漁獲漁業のポートフォリオ漁業設立条件は、魚種構成とその変化の把握の上での、特定魚種の漁獲及び水揚制限を行う必要があることが示された。
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Iwate University, 18KT0038
• The Impact of Industrialization on the Cultural Landscape and Food Security of the Wetlands : A Case Study of the Bangpakong River Basin, Chachoengsao, Thailand.
  Bilateral Programs
  Apr. 2021 - Mar. 2023
  Hajime Matsushima; Ariya Aruninta; Ryusuke Hatano; Tishufumi Igarashi; Tsubasa Otake; Satoshi Koike; Junjiro Negishi; John R. Bower; Ryo Takeda
  JSPS, NRCT-JSPS Joint Research Program, Hokkaido University;Chulalongkorn University, ［Internationally co-authored］, JPJSBP120219201
• Investigation of the distribution, abundance and early life history of gonatid squid paralarvae in the North Pacific
  Grants-in-Aid for Scientific Research
  2004 - 2006
  J.R. Bower
  This study describes the paralarvae of five gonatid squids from the North Pacific identified based on analyses of the mitochondrial DNA cytochrome oxidase subunit (COI) gene.
  A total of 281 paralarvae ranging in size from 2.76 to 13.50 mm ML were collected from surface waters in the North Pacific. The morphology of each was examined in detail, and the base sequence of the mtDNA COI gene area was determined. The base sequence data from adults of three species (Gonatopsis borealis, Berryteuthis anonychus, and Gonatus kamtchaticus) were also determined, and base-sequence data from the paralarvae were compared to those from the adults and from previously published studies. Based on this analysis, we positively identified the paralarvae of six paralarval morphotypes : 1) Gonatopsis sp. (slender), 2) Gonatopsis borealis (small), 3) Berryteuthis anonychus, 4) Gonatus pyros, 5) Gonatus onyx, and 6) Gonatus madokai.
  The results of this research were presented at four international symposia: 1) the 2004 PICES annual meeting in Honolulu (poster), 2) the 2005 PICES annual meeting in Vladivostok (oral), 3) the 2006 PICES annual meeting in Yokohama (poster), and 4) the 2007 AAAS (American Association for the Advancement of Science meeting in San Francisco (poster).
  Data collected in this research were also analyzed by a graduate student at Hokkaido University (Ms. Saya Shimura) and used to complete her master's thesis in 2006 (title: "DNA analysis and morphology of difficult-to-identify gonatid squid paralarvae").
  Two manuscripts based on the results of this study are now being prepared-one that describes the morphology of the paralarvae, and one that describes their distribution patterns. In addition, one paper describing a paralarva of the vampire squid (Vampyroteuthis infernalis) collected during this study was published last year (Bower et al. 2006).
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 16580141
• スルメイカ幼生の海水中のアミノ酸吸収を含む初期餌料の解明
  科学研究費助成事業
  2000 - 2002
  BOWER John R.
  本研究では、スルメイカ幼生の初期餌料について解明することを目的に以下の事項について調査を行った。(1)フィールドで採集した幼生の消化腺内容物の調査。(2)人口授精にて得たふ化幼生に、初期餌料となりうるプランクトン与え、その摂餌の可能性を調べる。(3)人口授精にて得られたふ化幼生に有機懸濁物(DOM)を与え、その吸収の可能性の有無を調べる。以下にそれぞれの部分の結果について報告する。
  (1)フィールドで採集した幼生の消化腺内容物の調査。
  日本海で採取したスルメイカ幼生を顕微鏡下で解剖し、その消化腺内容物ついて調べた。外套長1.2-3.3mmのスルメイカ幼生の顎片のみに、ノコギリ状の細かな歯の発達が観察され、初期餌料の索餌と密接に関連している可能性が示された。3.5mm未満の幼生の胃中には、植物プランクトンが認められず、液状物質のみが出現したことから、海中の有機物を摂餌している可能性が高い。一方外套長3.5mm以上のスルメイカの幼生のには、カイアシ類が認められたことから、このサイズから他生物を捕食する行動が始まると推察された。
  (2)人口授精にて得たふ化幼生の初期餌料の摂餌実験。
  道南(南茅部町)の定置網で採集したスルメイカ成体を水槽内で飼育し、成熟後、人口授精を実施して3000個体以上のふ化幼生を得た。初期餌料として可能性のある数種類の植物・動物プランクトンをふ化幼生に与えたが、それらの摂餌は認められなかった。
  (3)人口授精にて得られたふ化幼生の有機懸濁物(DOM)実験。
  有機懸濁物を調べるためには、ふ化幼生の無菌培養が必要条件である。そのため、人口授精には、交尾したスルメイカメスの受精のうから精子を抽出し、精子の殺菌を試みた。しかしこの実験は、バクテリアが無い状態(無菌培養)が維持できなかっため、困難であった。
  日本学術振興会, 奨励研究(A), 北海道大学, 12760123
• Study on the sampling properties of the plankton nets.
  Grants-in-Aid for Scientific Research
  2000 - 2002
  SAKAOKA Keiichiro; YONETA Kunisaburo; SHIGA Naonobu; MEGURO Toshimi; BOWER John; YAMAMOTO Jun
  Plankton nets have been used for as a method for collecting the plankton. Especially, the NORPAC-NET is widely used in order to keep the compatibility of the data and there are many long-term data based on the NORPAC samples. NORPAC-NET sampling is easy to operate, the wire angles often exceed 40 degrees when sea condition is rough. These would suggest that these samples were estimated over or less than the normal condition. Then, this study investigates the collection characteristic of the NORPAC net and the property of the long-term data set. Furthermore, the present study examines other plankton net, MTD-Net, Bongo-Net and the retention on the survey-net mesh.
  Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 12660158
• イカ類の生態学的研究
  Competitive research funding