Open Access Collection of International and Scholarly Papers
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Dietary effects of Artemia, rotifers, and their combination on larval survival and duration in the terrestrial hermit crab Coenobita cavipes (Decapoda: Anomura: Coenobitidae)
No full textTo improve our understanding of optimal feeding conditions for larval culture in terrestrial hermit crabs, we investigated larval survival and developmental duration to the megalopal stage in Coenobita cavipes. Larvae were reared under three feeding regimes: Artemia only (AR), rotifers only (RO), and a mixture of Artemia and rotifers (AR + RO), all of which are commonly used prey in the culture of decapod crustacean larvae. Although larval survival tended to be higher in the AR + RO group, feeding regime had no significant effect on survival rates. However, developmental duration to the megalopal stage varied among groups, with larvae in the AR + RO group exhibiting significantly shorter developmental times than those in the other groups. These results suggest that a mixed diet of Artemia and rotifers is an effective feeding regime for culturing C. cavipes larvae and may enhance larval survival and development in terrestrial hermit crabs under laboratory conditions.公開日: 2025-06-24journal articl
2023/2024 Annual Cruise Report of the T/V Shioji maru Voyage : Cruise Itineraries
Full text linkdepartmental bulletin pape
Recent Achievements of the OQEANOUS Plus Program＊6 and Its Impact on Global Education at Tokyo University of Marine Science and Technology
Full text link本稿は、本学が2021年度から実施する、日中韓・ASEAN大学間の海洋分野の高度専門職業人育成を目指す学生交流事業「オケアヌスプラス」が本学のグローバル教育に与えた新たな展開について考察した。第一に、オンラインを活用した導入プログラムへの参加が、実渡航を伴う中長期留学の参加に繋がる「段階的な留学モデルコース」を確立し、学生が卒業や就職活動に支障を感じることなく、外国の大学での教育研究による単位互換・学位取得も可能とし、学生の流動性を高められた。第二に、多様なアジアの大学間で、国際的な基準に配慮した質の保証を伴う単位互換ガイドラインCTSEAAを制定した。第三に、オンラインの活用がプログラムの教育効果を高め、コミュニケーションの機会を増やす手段として有効であること、そして第四に、教職員間ネットワークの強化が事業実施の重要な基盤となることを示した。また、初めての修了生アンケート結果の分析から、オケアヌスプラスの教育効果及び課題を確認できた。引き続き、事業最終年度（2025年度）に向けて、特に、留学による学びの可視化に取り組み教育効果を検証し、本学のグローバル教育に資する成果を目指す。This report examines the impact of the OQEANOUS Plus Program (OPP), a student exchange framework with quality assurance established between seven leading marine universities in Japan, China, ROK and ASEAN, on global education initiatives at Tokyo University of Marine Science and Technology. The OPP has demonstrated significant influence in four primary areas: (1) the provision of online and hybrid short-term introductory courses has established a phased study abroad model, leading students progressively engage in longer-term on-site exchange courses enabling seamless credit transfers and double-degree opportunities, without imposing any career constraints; (2) CTSEAA was established and authorized as a fundamental guideline on credit transfers and academic record conversions, ensuring quality assurance in international student exchanges; (3) the strategic integration of online platforms has enhanced both the quality of education and cross-cultural communication opportunities; and (4) building a strong professional network among academic and administrative personnel is the key to the successful execution of the OPP. Furthermore, post-program student surveys have revealed not only positive educational outcomes but also areas that require further attention, offering valuable insights for the future evolution of the program.中馬愛: 東京海洋大学学務部国際・教学支援課Ai CHUMAN: Academic Support and International Division, Tokyo University of Marine Science and Technology (TUMSAT)八田育美: 東京海洋大学学務部国際・教学支援課Ikumi HATTA: Academic Support and International Division, Tokyo University of Marine Science and Technology (TUMSAT)加賀絵里奈: 東京海洋大学学務部国際・教学支援課Erina KAGA: Academic Support and International Division, Tokyo University of Marine Science and Technology (TUMSAT)飯野知宏: 東京海洋大学学務部教務課Tomohiro IINO: Academic Affairs Division, Tokyo University of Marine Science and Technology (TUMSAT)申蓮花: 東京海洋大学学務部国際・教学支援課Lianhua SHEN: Academic Support and International Division, Tokyo University of Marine Science and Technology (TUMSAT)小山裕子: 東京海洋大学学務部国際・教学支援課Yuko OYAMA: Academic Support and International Division, Tokyo University of Marine Science and Technology (TUMSAT)呉海云: 東京海洋大学学術研究院海洋環境科学部門Haiyun WU: Department of Ocean Sciences, Tokyo University of Marine Science and Technology (TUMSAT)廣野育生: 東京海洋大学学術研究院海洋生物資源学部門Ikuo HIRONO: Department of Marine Biosciences, Tokyo University of Marine Science and Technology (TUMSAT)舞田正志: 東京海洋大学Masashi MAITA: Tokyo University of Marine Science and Technology (TUMSAT)departmental bulletin pape
A Method for Estimating the Fuel Consumption Characteristics of Small Boats Sailing in Medium to High-Speed Range
No full textThis study aims to develop an application software to support energy-efficient operation for small boats of less than 20 tons. In order to develop this system, statistical surveys have been conducted on the relationship between ship speed, engine speed, and fuel consumption on a 19-ton small boat for several years. As a result, it was confirmed that fuel consumption does not necessarily increase monotonically with an increase in ship speed. Authors considered that this phenomenon can be utilised for saving fuel consumption in small boats effectively. In order to realise it, it is required to identify fuel consumption trends and compare the trends with the observed data. However, fuel consumption trends are affected by hull fouling, load weight and trim balance. For this reason, fuel consumption trend needs to be determined for each voyage. For the convenience of boat operators, it is desirable that fuel consumption trends are estimated by an easy, simple, and cost-effective method as soon as possible after leaving the port. The method proposed in the previous study was highly accurate, but it was not convenient due to two problems. This study proposes a new method for estimating fuel consumption trends that solves these issues. In order to develop a new estimation method, this study focuses on the hull frictional resistance. It was assumed that the effect of wave-making resistance on energy consumption in small boats saturates at medium to high speeds, and frictional resistance becomes the dominant factor. Thus, the fuel consumption trend of the boat was analysed on the assumption that it follows a fundamental physical law proportional to the cube of the ship's speed. Based on these assumptions, this study developed a new equation model that expresses the fuel consumption trend of small boats sailing in medium to high-speed range. The fuel consumption trend determined with the new model achieved proper performance. In addition, the method of estimating the fuel consumption trend using this model solves the two problems of the method of previous study.公開日: 2025-07-20journal articl
Development of a Method for in vivo Direct Monitoring of Stored Fat Burning Using Stable Isotope-labeled Fatty Acids
No full textWe developed a novel approach for direct and rapid evaluation of the fat-burning effects of various food ingredients in vivo. Male ICR mice were fed a diet containing stable isotope-labeled palmitic acid, and fat oxidation was quantified by measuring the production of labeled carbon dioxide (13CO2) generated during β-oxidation. By evaluating the 24-h fat burning profile, we demonstrated the immediate fat-burning effect of caffeine and the gradual fat-burning effect of curcumin. This methodology allows fat-burning-specific detection rather than fat absorption inhibition, thereby providing a powerful tool for comparing fat-burning effects of different food components in vivo.公開日: 2025-04-01journal articl
Effect of body size on cannibalism in juvenile mud crab Scylla serrata (Decapoda: Brachyura: Portunidae) under laboratory conditions
No full text公開日: 2025-09-12journal articl
噴火湾アイヌのデバ舟
Full text link東京海洋大学修士(海洋科学)東京海洋大学修士学位論文 2025年度(2025年9月) 海運ロジスティクス 修士 第4659号指導教員: 岩淵聡文全文公表年月日: 2025-12-18master thesi
MOVESモデルを用いた大型トラックからの排出量推定：タイの港湾におけるケーススタディ
Full text link東京海洋大学修士(工学)東京海洋大学修士学位論文 2025年度(2025年9月) 海運ロジスティクス 修士 第4662号指導教員: 渡部大輔全文公表年月日: 2025-12-18master thesi
Survival and feeding of the red swamp crayfish Procambarus clarkii (Decapoda: Astacidea: Cambaridae) under low-temperature conditions
No full textThe red swamp crayfish Procambarus clarkii is an invasive alien species widespread across Japan. In Hokkaido, its northernmost range, populations have established in rivers and streams where winter water temperatures remain relatively high due to inflows from hot springs or treated sewage. To help infer the potential northern distribution limit of P. clarkii in Japan, we examined survival and feeding activity of adult specimens under controlled cold-temperature conditions. Specimens (seven females and eight males) were individually housed in plastic cups and placed in temperature-controlled chambers (14 ± 1°C), one for each sex. Chamber temperatures were decreased by approximately 1°C per day over 12 days and then maintained at the final level for 10 days. During the coldest period, temperatures unintentionally differed between chambers, with lower values recorded for males (mean: 1.2°C) than females (mean: 3.1°C). Mortality occurred in two males, either on the day temperatures dropped below 1°C or the following day. Feed consumption rates were higher in females, likely reflecting sex-specific physiological traits and their exposure to higher temperatures. Although our experimental design did not allow for a direct comparison of cold tolerance between sexes, our results indicate that temperatures near 1°C was the point at which males began to die.公開日: 2025-07-21journal articl
GNSSアンカーを有するセシウム原子時計群に対する最適制御の検討
Full text link東京海洋大学修士(工学)東京海洋大学修士学位論文 2024年度(2025年3月) 海洋システム工学 修士 第4582号指導教員: 小池雅和全文公表年月日: 2025-06-13master thesi