Tokushima University / Educator and Researcher Directory --- Oka, Naohiro

Field of Study

○	水産増殖学

Subject of Study

○	有用海藻の増養殖，機能性成分の探索

Book / Paper

Book:

1.	平岡雅規, Naohiro Oka and 永松和成 : Ⅲ．藻類培養への利用 4．海藻類の培養, 恒星社厚生閣, 2006.
2.	Masanori Hiraoka and Naohiro Oka : Mariculture of seaweeds based on the new "germling cluster method" and utilizing deep seawater in Japan., University of Malaya Maritime Research Centre, 2004.

Academic Paper (Judged Full Paper):

1.	YAMAMURO Tatsuya, Tatsuo Hamano, Takayasu Yonezawa, Masaya Satoh and Naohiro Oka : Effect of different light quality on growth of juvenile Undaria pinnatifida sporophytes and holdfasts, --- Wakame (Undaria pinnatifida) in Japan is mainly produced by aquaculture, and juvenile sporophytes are used as sporelings in wakame aquaculture. In this study, we used three types of LED lighting (red, green, and blue) and fluorescent light to evaluate the effects on the growth of sporophytes (blade area) and holdfasts. The daily growth rate calculated from the blade area of the sporophyte was higher at 59.5 ± 6.2% under blue light and lower at 43.0 ± 5.7% under red light. Regarding the area and a number of holdfasts, blue and fluorescent lights had a larger area and the number. On the other hand, red light had the lowest values for both. An evaluation of the above revealed that the use of blue LED is suitable for sporeling production after the fertilization of gametophytes. ---, Algal Resources, Vol.17, No.2, 27-33, 2025. (Keyword) ワカメ / Undaria pinnatifida / juvenile sporophyte / holdfast / sporeling production
2.	Takahashi Shota and Naohiro Oka : Optimal physical growth conditions for conchocelis of the red alga Neophyropia tenera., Algal Resources, Vol.17, No.2, 21-26, 2025.
3.	Zhong Kai-Le, Hiraoka Masanori, Gao Xu, Russell Bayden, Hu Zi-Min, Chen Weizhou, Kim Ju-Hyoung, Yotsukura Norishige, Endo Hikaru, Naohiro Oka, Yoshikawa Shinya and Gaitan-Espitia Diego Juan : Environmental gradients influence geographic differentiation and low genetic diversity of morphologically similar Ulva species in the Northwest Pacific, Botanica Marina, Vol.67, No.2, 139-152, 2024. (Link to Publication Site) ● Publication site (DOI): 10.1515/bot-2023-0073 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85187115372 (DOI: 10.1515/bot-2023-0073, Elsevier: Scopus)
4.	喜多郁弥, 米澤孝康, 岡本裕太, 團昭紀, Tatsuo Hamano and Naohiro Oka : 藻体抽出液を用いたスジアオノリ種苗生産に適した光量・光質条件の検討, Algal Resources, Vol.16, No.1, 69-76, 2023.
5.	加藤慎治, 朝田健斗, 池脇義弘, 吉田和貴, Naohiro Oka, 團昭紀 and Tatsuo Hamano : Development of an inexpensive and simple fertilizer method using plastic bottles with a semipermeable membrane for seaweed cultivation, Algal Resources, Vol.15, No.2, 33-42, 2022. (Keyword) Fertilizer / Plastic bottles / Semipermeable membrane / Seaweed cultivation / <i>nori</i> (Link to Publication Site) ● Publication site (DOI): 10.20804/jsap.15.2_33 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390299362593206912 ● Search Scopus @ Elsevier (DOI): 10.20804/jsap.15.2_33 (DOI: 10.20804/jsap.15.2_33, CiNii: 1390299362593206912)
6.	Soichiro Seki, Yumiko Yamano, Naohiro Oka, Yasuhiro Kamei and Ritsuko Fujii : Discovery of a novel siphonaxanthin biosynthetic precursor in Codium fragile that accumulates only by exposure to blue-green light, FEBS Letters, Vol.596, No.12, 1544-1555, 2022. (Summary) Photosynthetic organisms adapt to a variety of light conditions. Codium fragile, a macrosiphonous green alga, binds a unique carbonyl carotenoid, siphonaxanthin, to its major photosynthetic light-harvesting complexes, allowing it to utilize dim blue-green light for photosynthesis. Here, we describe the absolute chemical structure of a novel siphonaxanthin biosynthetic precursor, 19-deoxysiphonaxanthin, that accumulates specifically in the photosynthetic antenna only when cultivated under blue-green light. The action spectra of pigment accumulation suggest that siphonaxanthin biosynthesis is regulated by a specific wavelength profile. The results provide clues to a new acclimation mechanism to withstand hours of intense light at low tide and why siphonous algae have been growing invasively on the world's coasts for more than a century. (Link to Publication Site) ● Publication site (DOI): 10.1002/1873-3468.14357 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 35460262 ● Summary page in Scopus @ Elsevier: 2-s2.0-85129805586 (DOI: 10.1002/1873-3468.14357, PubMed: 35460262, Elsevier: Scopus)
7.	Fumiya Kita, Yuta Okamoto, 團昭紀, Tatsuo Hamano and Naohiro Oka : 藻体抽出液を用いたスジアオノリ種苗生産における組織培養条件の検討, Algal Resources, Vol.15, No.1, 1-8, 2022. (Link to Publication Site) ● Publication site (DOI): 10.20804/jsap.15.1_1 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.20804/jsap.15.1_1 (DOI: 10.20804/jsap.15.1_1)
8.	Tetsushi Kagawa, Minoru Saito, Naohiro Oka, Tatsuo Hamano and 宮田勉 : Effective use of small size shellfish discarded in the small-scale bottom trawls - On the compact culture of the Japanese cockle in an underused fishing port and the seedlings for the culture, Journal of Coastal Zone Studies, Vol.33, No.3, 27-35, 2020. (Keyword) トリガイ / 漁港 / コンパクト養殖 / 投棄トリガイ / Japanese cockle / fishing port / compact culture / discarded cockle / ギョコウ / コンパクトヨウショク / トウキトリガイ (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520572359501630976 (CiNii: 1520572359501630976)
9.	齋藤稔, 高橋直己, 小部博正, 米澤隆志, 米澤孝康, 赤松良久, 中尾遼平, Naohiro Oka and Tatsuo Hamano : EVALUATING EFFECT OF PORTABLE FISHWAY INSTALLATION ON THE INSTREAM DISTRIBUTION OF PLECOGLOSSUS ALTIVELIS ALTIVELIS IN THE HIWASA RIVER, TOKUSHIMA PREFECTURE, Advances in River Engineering, Vol.26, 379-384, 2020. (Summary) We tested the effects of portable fishway installation in restoring upstream population of the Ayu Plecoglossus altivelis altivelis in the Hiwasa River, Japan. Roughly 60000 and 350 Ayu ascended through the portable fishway in 2018 and 2019, respectively. Density of Ayu in 2018 compared to those in 2017 was higher in the upper reaches while lower in the lower reaches, insisting that the portable fishway installation helped restoring the longitudinal connectivity for the fish species. In contrast, fishway installation of the same type in 2019 did not assist upstream migration of the fish as in 2018, partly due to the lower number of recruitments in the year and difficulty in gathering fish around the fishway entrance. Results of environmental DNA analysis correlated with snorkel counts in May 2019 but not in September 2019 in the river. Continued surveys are needed to clarify the effects of portable fishway installation in rehabilitating longitudinal connectivity in the river, as the recruitment of the fish change annually. (Keyword) stream / rehabilitation / diadromy / upstream migration / snorkel counting / eDNA (Link to Publication Site) ● Publication site (DOI): 10.11532/river.26.0_379 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390573242800338432 ● Search Scopus @ Elsevier (DOI): 10.11532/river.26.0_379 (DOI: 10.11532/river.26.0_379, CiNii: 1390573242800338432)
10.	喜多郁弥, 團昭紀, Tatsuo Hamano, 齋藤稔 and Naohiro Oka : Seedling production method of Ulva prolifera using ground fragments with addition of extract from the thalli, Algal Resources, Vol.12, 11-20, 2019. (Summary) Stabilization of seedling production is an urgent issue in the land-based cultivation of <i>Ulva prolifera</i>. In this study, we established a new seedling production method, in which branching formation from ground fragments is stimulated by addition of the Solution Extracted from Homogenized Thalli (SHET) of <i>U. prolifera</i>. The cells in the fragments cultured with SHET differentiated into six types of cells: swelled cells, branch cells, rhizoid cells, matured cells, empty cells, or dead cells. As the amount of the added SHET increased, the proportion of the fragments with branch cells increased. The branch cells grew normally, forming leaves after 7 days of culture period. Within the tested settings, the rate of branch formation increased accordingly to the extension of storage period and increase in culture temperature. We recommend storage period of 6 weeks and incubation temperature of 25℃ for seedling production, as the increase of maturing cells at 30℃ makes seedling production unstable, especially after extended storage period. (Keyword) land-based cultivation / <i>Ulva prolifera</i> / tissue culture / branch cells (Link to Publication Site) ● Publication site (DOI): 10.20804/jsap.12.1_11 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1390289068497660032 ● Search Scopus @ Elsevier (DOI): 10.20804/jsap.12.1_11 (DOI: 10.20804/jsap.12.1_11, CiNii: 1390289068497660032)
11.	Hirohumi Yamamoto, Yuichi Takagi, Naoto Yamasaki, Tadashi Mitsuyama, Yusuke Kasai, Hiroshi Imagawa, Yutaro Kinoshita, Naohiro Oka and Masanori Hiraoka : Syntheses of thallusin analogues and their algal morphogenesis-inducing activities, Tetrahedron, Vol.74, No.50, 7173-7178, 2018. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.tet.2018.10.048 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85055913516 (DOI: 10.1016/j.tet.2018.10.048, Elsevier: Scopus)
12.	Masanori Hiraoka, Kensuke Ichihara, Wenrong Zhu, Satoshi Shimada, Naohiro Oka, Jianjun Cui, Shuntaro Tsubaki and Peimin He : Examination of species delimitation of ambiguous DNA-based Ulva (Ulvophyceae, Chlorophyta) clades by culturing and hybridisation, Phycologia, Vol.56, No.5, 517-532, 2017. (Link to Publication Site) ● Publication site (DOI): 10.2216/16-109.1 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-85026811566 (DOI: 10.2216/16-109.1, Elsevier: Scopus)
13.	棚田教生, 團昭紀, 加藤慎治, Naohiro Oka and Tatsuo Hamano : Curtivar improvement of Undaria pinnatifida (Harvey) Suringar by reciprocal crossing free-living male/female gametophytes between a Kagoshima natural strain and a Naruto cultivar, Algal Resources, Vol.8, No.2, 103-112, 2015.
14.	棚田教生, 團昭紀, 日下啓作, Naohiro Oka and Tatsuo Hamano : A new practical method for mass seedling production of Undaria pinnatifida (Harvey) Suringar using free-living gametophytes that originated from single zoospores and its application for commercial cultivation., Algal Resources, Vol.8, No.1, 23-36, 2015. (Link to Publication Site) ● Publication site (DOI): 10.20804/jsap.8.1_23 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.20804/jsap.8.1_23 (DOI: 10.20804/jsap.8.1_23)
15.	Chiasa Uragami, Denise Galzerano, Andrew Gall, Yusuke Shigematsu, Maiwen Meisterhans, Naohiro Oka, Masahiko Iha, Ritsuko Fujii, Bruno Robert and Hideki Hashimoto : Light-dependent conformational change of neoxanthin in a siphonous green alga, Codium intricatum, revealed by Raman spectroscopy., Photosynthesis Research, Vol.121, No.1, 69-77, 2014. (Summary) Siphonous green algae, a type of deep-sea green algae, appear olive drab and utilize blue-green light for photosynthesis. A siphonous green alga, Codium (C.) intricatum, was isolated from Okinawa prefecture in Japan, and a clonal algal culture in filamentous form was established. The major light-harvesting antenna was analogous to the trimeric LHCII found in higher plants, but the C. intricatum complex contained an unusual carbonyl carotenoid siphonaxanthin. Culture conditions were optimized to achieve high siphonaxanthin content in intact lyophilized filamentous bodies. Interestingly, the carotenoid composition was different when cultured under high irradiance: all-trans neoxanthin was accumulated in addition to the normal 9'-cis form in whole cell extract. Resonance Raman spectra of intact filamentous bodies, cultured under high- and low-light conditions, confirmed the accumulation of all-trans neoxanthin under high irradiance conditions. A plausible function of the presence of all-trans neoxanthin will be discussed in relation to the regulation against high light stress. (Keyword) Chlorophyta / Spectrum Analysis, Raman / Xanthophylls (Link to Publication Site) ● Publication site (DOI): 10.1007/s11120-014-0011-y (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 24861896 ● Summary page in Scopus @ Elsevier: 2-s2.0-84902245908 (DOI: 10.1007/s11120-014-0011-y, PubMed: 24861896, Elsevier: Scopus)
16.	Ritsuko Fujii, Mamiko Kita, Yoshiro Iinuma, Naohiro Oka, Yuki Takaesu, Tomonori Taira, Masahiko Iha, R.J. Cogdell and Hideki Hashimoto : Isolation and purification of the major photosynthetic antenna, fucoxanthin-Chl a/c protein, from cultured discoid germlings of the brown algae, Cladosiphon okamuranus TOKIDA(Okinawa Mozuku), Photosynthesis Research, Vol.111, No.1-2, 157-163, 2012. (Summary) A chlorophyll c binding membrane intrinsic light-harvesting complex, the fucoxanthin-chlorophyll a/c protein (FCP), was isolated from cultured discoid germilings of an edible Japanese brown alga, Cladosiphon (C.) okamuranus TOKIDA (Okinawa Mozuku in Japanese). The discoid germiling is an ideal source of brown algal photosynthetic pigment-protein complexes in terms of its size and easiness of cultivation on a large scale. Ion-exchange chromatography was crucial for the purification of FCP from solubilized thylakoid proteins. The molecular weight of the purified FCP assembly was estimated to be ~56 kDa using blue native-PAGE. Further subunit analyses using 2D-PAGE revealed that the FCP assembled as a trimer consisting of two distinguishable subunits having molecular weights of 18.2 (H) and 17.5 (L) kDa. Fluorescence and fluorescence-excitation spectra confirmed that the purified FCP assembly was functionally intact. (Keyword) Centrifugation, Density Gradient / Chlorophyll Binding Proteins / Chromatography, Gel / Chromatography, Ion Exchange / Light-Harvesting Protein Complexes / Molecular Weight / Phaeophyta / Spectrometry, Fluorescence / Thylakoids (Link to Publication Site) ● Publication site (DOI): 10.1007/s11120-011-9688-3 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 21948618 ● Search Scopus @ Elsevier (PMID): 21948618 ● Search Scopus @ Elsevier (DOI): 10.1007/s11120-011-9688-3 (DOI: 10.1007/s11120-011-9688-3, PubMed: 21948618)
17.	D. kosumi, R. Fujii, M. Sugisaki, Y. Iinuma, Naohiro Oka, Y. Takaesu, T. Taira, M. Iha, H.A. Frank and H. Hashimoto : Excitation Energy Transfer Dynamics of Fucoxanthin-Chlorophyll-a/c-Protein, Carotenoid Science, Vol.17, 41-45, 2012.
18.	Naohiro Oka, Toshiyuki Kusumoto, Tomonori Taira, Masahiko Iha, Hironori Shigematsu, Ritsuko Fujii and Hideki Hashimoto : Novel mass production of siphonaxanthin from a green algae, "Motsure-miru(Codium intricatum)"., Carotenoid Science, Vol.17, 23-26, 2012.
19.	Ritsuko Fujii, Mamiko Kita, Matsumi Doi, Yoshiro Iinuma, Naohiro Oka, Yuki Takaesu, Tomonori Taira, Masahiko Iha, Tadashi Mizoguti, R.J. Cogdell and Hideki Hashimoto : The pigment stoichiometry in a chlorophyll a/c type photosynthetic antenna., Photosynthesis Research, Vol.111, No.1-2, 165-172, 2011. (Summary) The trimeric fucoxanthin-chlorophyll a/c protein (FCP) was purified from a Japanese brown alga, Cladosiphon okamuranus TOKIDA. Its pigment stoichiometry was determined to be chlorophyll (Chl) a:Chl c (1):Chl c (2):fucoxanthin = 4.6:1.1:1.0:5.5 by a combination of binary HPLC and (1)H NMR spectroscopy. No violaxanthin found bound to the FCP. The ratio of Chl c/Chl a in this FCP is amongst the highest so far reported. (Keyword) Chlorophyll Binding Proteins / Chromatography, High Pressure Liquid / Chromatography, Reverse-Phase / Magnetic Resonance Spectroscopy / Phaeophyta / Photosynthesis (Link to Publication Site) ● Publication site (DOI): 10.1007/s11120-011-9698-1 (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 21997123 ● Summary page in Scopus @ Elsevier: 2-s2.0-84858160890 (DOI: 10.1007/s11120-011-9698-1, PubMed: 21997123, Elsevier: Scopus)
20.	Daisuke Kosumi, Toshiyuki Kusumoto, Ritsuko Fujii, Mitsuru Sugisaki, Yoshiro Iinuma, Naohiro Oka, Yuki Takaesu, Tomonori Taira, Masahiko Iha, Harry A. Frank and Hideki Hashimoto : Ultrafast excited state dynamics of fucoxanthin: excitation energy dependent intramolecular charge transfer dynamics., Physical Chemistry Chemical Physics, Vol.13, No.22, 10762-10770, 2011. (Summary) Carotenoids containing a carbonyl group in conjugation with their polyene backbone are naturally-occurring pigments in marine organisms and are essential to the photosynthetic light-harvesting function in aquatic algae. These carotenoids exhibit spectral characteristics attributed to an intramolecular charge transfer (ICT) state that arise in polar solvents due to the presence of the carbonyl group. Here, we report the spectroscopic properties of the carbonyl carotenoid fucoxanthin in polar (methanol) and nonpolar (cyclohexane) solvents studied by steady-state absorption and femtosecond pump-probe measurements. Transient absorption associated with the optically forbidden S(1) (2(1)A) state and/or the ICT state were observed following one-photon excitation to the optically allowed S(2) (1(1)B) state in methanol. The transient absorption measurements carried out in methanol showed that the ratio of the ICT-to-S(1) state formation increased with decreasing excitation energy. We also showed that the ICT character was clearly visible in the steady-state absorption in methanol based on a Franck-Condon analysis. The results suggest that two spectroscopic forms of fucoxanthin, blue and red, exist in the polar environment. (Keyword) Energy Transfer / Molecular Dynamics Simulation / Xanthophylls (Link to Publication Site) ● Publication site (DOI): 10.1039/c0cp02568b (Link to Search Site for Scientific Articles) ● PubMed @ National Institutes of Health, US National Library of Medicine (PMID): 21552626 ● Summary page in Scopus @ Elsevier: 2-s2.0-79959734672 (DOI: 10.1039/c0cp02568b, PubMed: 21552626, Elsevier: Scopus)
21.	Daisuke Kosumi, Toshiyuki Kusumoto, Ritsuko Fujii, Mitsuru Sugisaki, Yoshiro Iinuma, Naohiro Oka, Yuki Takaesu, Tomonori Taira, Masahiko Iha, Harry A. Frank and Hideki Hashimoto : Ultrafast S1 and ICT state dynamics of a marine carotenoid probed by femtosecond one- and two-photon pump-probe spectroscopy., Journal of Luminescence, Vol.131, No.3, 515-518, 2011. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.jlumin.2010.09.018 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-79952194330 (DOI: 10.1016/j.jlumin.2010.09.018, Elsevier: Scopus)
22.	Daisuke Kosumi, Toshiyuki Kusumoto, Ritsuko Fujii, Mitsuru Sugisaki, Yoshiro Iinuma, Naohiro Oka, Yuuki Takaesu, Tomonori Taira, Masahiko Iha, Harry A. Frank and Hideki Hashimoto : One- and two-photon pump-probe optical spectroscopic measurements reveal the S1 and intramolecular charge transfer states are distinct in fucoxanthin., Chemical Physics Letters, Vol.483, No.1-3, 95-100, 2009. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.cplett.2009.10.077 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-72049087447 (DOI: 10.1016/j.cplett.2009.10.077, Elsevier: Scopus)
23.	Yoshirou Iinuma, Naohiro Oka, Tomonori Taira and Masahiko Iha : Novel mass production of fucoxanthin from a brown algae, "Okinawa-Mozuku (Cladosiphon okamuranus)"., Carotenoid Science, Vol.14, 1-5, 2009.
24.	Naohiro Oka, Takashi Sumida, Masanori Hiraoka and Masao Ohno : Effects of Fe(II) for tank cultivation of Ulva prolifera in deep seawater., Algal Resources, Vol.2, No.1, 63-66, 2008.
25.	Masanori Hiraoka and Naohiro Oka : Tank cultivation of Ulva prolifera in deep seawater using a new "germling cluster" method., Journal of Applied Phycology, Vol.20, No.1, 97-102, 2008. (Link to Publication Site) ● Publication site (DOI): 10.1007/s10811-007-9186-3 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/s10811-007-9186-3 (DOI: 10.1007/s10811-007-9186-3)
26.	Naohiro Oka, Masanori Hiraoka and Toshitaka Nishijima : Growth of abalone fed on Undaria pinnatifida (Alariaceae, Phaeophyceae) cultivated as free living form "germling cluster" in deep seawater., Japan Journal of Phycology, Vol.52(supplement), 225-230, 2004.
27.	Masanori Hiraoka, Masao Ohno, Akinori Dan and Naohiro Oka : Utilization of deep seawater for the mariculture of seaweeds in Japan., Japan Journal of Phycology, Vol.52(supplement), 215-219, 2004.
28.	川井唯史, Naohiro Oka, 平岡雅規, 四ツ倉典滋 and 中明幸広 : ホソメコンブ配偶体の生長に及ぼす硝酸塩の影響, 水産工学, Vol.41, No.1, 35-38, 2004.
29.	Kanami Mori, Takashi Ooi, Masanori Hiraoka, Naohiro Oka, Hideyuki Hamada, Mitsumasa Tamura and Takenori Kusumi : Fucoxanthin and Its Metavolites in Edible Brown Algae Cultivated in Deep Seawater., Marine Drugs, Vol.2, No.2, 63-72, 2004.

Academic Paper (Unrefereed Paper):

1.	香川哲, 湯谷篤, Naoshi Hashimoto, Naohiro Oka, Tatsuo Hamano, 米澤孝康, 齊藤稔 and 宮田勉 : 香川県の低利用漁港における未利用小型トリガイのコンパクト養殖の試み -高齢漁業者と漁家女性の新たな活躍の場として-, 香水試研報, No.22, 1-9, 2023.

Proceeding of International Conference:

1.	Masao Ohno, Takashi Sumida, Naohiro Oka and Masanori Hiraoka : Effect of Fe+ for Enteromorpha tank culture with deep seawater., The 5th Asian-Pacific Conference on Algal Biotechnology, 2003.
2.	Naohiro Oka, Masanori Hiraoka and Toshitaka Nishijima : Growth of abalone fed on Undaria pinnatifida cultivated as free living form "germling aggregation" in deep seawater., Algae 2002, 2002.

Proceeding of Domestic Conference:

1.	関荘一郎, 山野奈美, ゴールアンドリュー, キムウンチュル, 宮田知子, 牧野文信, Naohiro Oka, 倉島彰, 川井浩史, 荒木良一, 田中秀明, 皆川純, ロベールブルーノ, 張建平, 難波啓一, 栗栖源嗣 and 藤井律子 : 海藻由来光合成アンテナの立体構造の多様性から分かる青緑色光吸収機構, 日本藻類学会第49回大会, Mar. 2025.
2.	Naohiro Oka : 大型海藻の微視的世代を用いた機能性成分の生産, 第148回徳島生物学会, Jan. 2025.
3.	Tatsuya Yamamuro, Masaya Hayashi, Takayasu Yonezawa, Yutaka Hori, Tatsuo Hamano, Masaya Satoh and Naohiro Oka : アカモクの種苗生産に適した培養液の検討, 徳島生物学会第148回総会, Jan. 2025. (Summary) <背景> アカモクSargassum horneriはヒバマタ目ホンダワラ科の褐藻類で，主に藻場造成や食用として利用されている．藻場造成や養殖には，母藻から回収した幼胚を保存しておき，適期に発芽させた発芽体を種苗に用いている．種苗生産には海水に培養液を添加した培養海水が使用されているが，培養海水の最適な交換時期や最適な培養液の添加量に関する知見は乏しい．そこで，本研究は海藻の培養液に多く用いられるPESI(Provasoli's Enriched Seawater)や栄養剤ポルフィランコンコ(第一製網株式会社)を濃度を変えて添加した培養海水でアカモク発芽体を培養し，生長を比較・評価した． <方法> 葉長0.5 ∼ 2 mmまで育てたアカモク発芽体を，PESIまたはポルフィランコンコを添加した培養海水を満たしたマルチプレートに1個体ずつ移し，昼白色蛍光灯下(光量50μmolm-2s-1)，20℃に設定した培養庫で培養した．PESIの添加量は0, 5, 10, 20, 40, 80 ml/Lとし，ポルフィランコンコの添加量は 0，0.005，0.05，0.5，5，50 ml/Lとした．PESIでは21日間，ポルフィランコンコでは28日間培養した後で，開始時と終了時の面積から算出した日間生長率を算出した．また，培養の前後で，培養海水のNO3-N量をオートアナライザー(QuAAtro39, ビーエルテック)を使用して測定し，藻体の窒素吸収量を調べた． <結果と考察> PESI添加培養海水では，検討したすべての濃度において無添加よりも生長の促進が見られ，これらの間で有意差は確認されなかった．しかし，培養海水中の窒素量の減少量はPESIが多いと少なくなることから，みかけの生長と藻体の中の窒素量とが必ずしも対応しないことがわかった．その理由は不明である．ポルフィランコンコ添加培養海水では，0.05 ml/Lで最も生長が促進され，5 ml/Lでは無添加よりも生長が悪く，生長阻害効果があらわれた．5 ml/Lでは培養海水中の窒素が著しく減少しているが，これは培養中に培養海水の塩類が結晶化していたためであり，それが生長に悪影響を与えたと考えられる．今後，さらにアカモクの培養に適した培養を検討していく予定である． (Keyword) アカモク / Sargassum horneri / seed production
4.	Haruna Matsuda, 中西達也, Takayasu Yonezawa and Naohiro Oka : 『阿波誌』の記載からみる徳島県の海藻資源利用, 日本応用藻類学会第22回大会, Sep. 2024.
5.	SEYAMA Akira, Haruna Matsuda, MIMATSU Takafumi, YAMAMURO Tatsuya, Takayasu Yonezawa and Naohiro Oka : 紅藻タオヤギソウの生長に対する物理的要因, 日本応用藻類学会第22回大会, Sep. 2024.
6.	TAKAHASHI Shota, Haruna Matsuda and Naohiro Oka : 紅藻アサクサノリ糸状体の至適生長条件の探索その2, 日本応用藻類学会第22回大会, Sep. 2024.
7.	TERAMOTO Shuri, Haruna Matsuda, 岩本健輔, 堀田智恵 and Naohiro Oka : 微細藻類2種の培養における化学的影響, 日本応用藻類学会第22回大会, Sep. 2024.
8.	HIRAI Naruya, Haruna Matsuda and Naohiro Oka : 紅藻Agardhiella subulataの色調に与える栄養成分の影響, 日本応用藻類学会第22回大会, Sep. 2024.
9.	MIMATSU Takafumi, SEYAMA Akira, Haruna Matsuda, YAMAMURO Tatsuya, Takayasu Yonezawa and Naohiro Oka : 紅藻タオや愚僧の詩文胞子の発生に及ぼす光質の影響, 日本応用藻類学会第22回大会, Sep. 2024.
10.	HAMAUCHI Takara, SEYAMA Akira, Haruna Matsuda and Naohiro Oka : フリー配偶体を用いたワカメ種苗生産の最適な継代培養条件の検討, 日本応用藻類学会第22回大会, Sep. 2024.
11.	和宇慶琴音, 落合笑里, 上田ゆかり, Naohiro Oka, 田中智樹 and 山本博文 : 内在性カラギナンを利用したあかねそう®裸錠の開発, 日本薬学会第144年会, Mar. 2024.
12.	SEYAMA Akira and Naohiro Oka : タオヤギソウ葉状体の生長及び四分胞子の生長と形態変化に対する水温の影響, 日本応用藻類学会第21回大会, Sep. 2023.
13.	Naohiro Oka, TAKAHASHI Shota and Tatsuo Hamano : 紅藻アサクサノリ糸状体の至適生長条件の探索, 日本応用藻類学会第21回大会, Sep. 2023.
14.	Tatsuo Hamano, TERAMOTO Shuri, Naohiro Oka, 岩本健輔, Akinori Tsuji, Tatsuya Yamamuro, Takayasu Yonezawa and 堀豊 : 珪藻培養における安価なLED水中灯の活用, 日本応用藻類学会第21回大会, Sep. 2023.
15.	Naohiro Oka, OKITOH Yuki, SEYAMA Akira, Norio Tanada and Tatsuo Hamano : フリー配偶体を用いたワカメ種苗生産の最適な予備培養条件の検討, 日本応用藻類学会第21回大会, Sep. 2023.
16.	Yoshihiko Ueno, Yosuke Seki, Takefumi Hattori, Atsushi Tabata, Rie Mukai, Naohiro Oka and Yoshihiro Uto : B学部における学校推薦型選抜Ⅰ地方創生型(地域産業振興枠)の設計と実施 ―入試業務効率化に向けた新たな取り組みを踏まえて―, 令和5年度全国大学入学者選抜研究連絡協議会大会(第18回), May 2023.
17.	関荘一郎, 山野由美子, Naohiro Oka, 亀井保博 and 藤井律子 : 大型海洋藻ミルの青緑色強光下におけるカロテノイド組成の変化と新規シフォナキサンチン生合成中間体の発見, 日本藻類学会, Mar. 2023.
18.	SAIKI Tsubasa, Naoshi Hashimoto, 喜多郁弥, 米澤孝康, Naohiro Oka and Tatsuo Hamano : 徳島県鳴門市における養殖わかめの未利用部分の処理実態と今後の活用について, 日本応用藻類学会第20回記念大会, Sep. 2022.
19.	喜多郁弥, 藤田航輔, 米澤孝康, Naohiro Oka, Tatsuo Hamano and 團昭紀 : 藻体抽出液を用いたスジアオノリ種苗生産における光条件の検討, 日本応用藻類学会第20回記念大会, Sep. 2022.
20.	Naohiro Oka, 田浦大成, 久保田正人 and Tatsuo Hamano : 珪藻Chaetoceros gracilisの簡易計測方法の開発と光質の違い, 日本応用藻類学会第20回記念大会, Sep. 2022.
21.	Naohiro Oka, 平田開斗, Akira Seyama and Tatsuo Hamano : アサクサノリ糸状体の生長における光環境の影響, 日本応用藻類学会第20回記念大会, Sep. 2022.
22.	Akiyama Chiari, Norioka Naoko, Naohiro Oka, Yamano Yumiko, Nakaniwa Tetsuko, Tanaka Hideaki, Kurisu Genji and Fujii Ritsuko : In-vitro reconstruction of light-harvesting complexes of siphonous green alga, Codium fragile, 第59回日本生物物理学会年会, Nov. 2021.
23.	Naohiro Oka, 上垣りさ, 岡本裕太, 團昭紀, 加藤美砂子 and Tatsuo Hamano : 淡水エビ類と藻類の複合養殖の研究(予報), 日本応用藻類学会第19回大会, Sep. 2021.
24.	岡本裕太, Naohiro Oka, 喜多郁弥, 加藤美砂子, 團昭紀 and Tatsuo Hamano : 異なるスジアオノリ4株の生長に対する水温特性の把握と陸上養殖への応用, 日本応用藻類学会第19回大会, Sep. 2021.
25.	喜多郁弥, 團昭紀, Naohiro Oka and Tatsuo Hamano : スジアオノリ陸上養殖のための種苗生産技術の確立, 日本応用藻類学会第19回大会, Sep. 2021.
26.	谷岡力, Naohiro Oka and Tatsuo Hamano : ワカメ雌雄配偶体のフコキサンチン産生に対する光環境の影響について, 日本応用藻類学会第19回大会, Sep. 2021.
27.	Naohiro Oka, 四宮佑一郎, 多田篤司, 棚田教生, 谷岡力, 梅原大智 and Tatsuo Hamano : ワカメ幼胞子体の生長に対する日長の影響, 日本応用藻類学会第19回大会, Sep. 2021.
28.	加藤慎治, 朝田健斗, 池脇義弘, 吉田和貴, Naohiro Oka, 團昭紀 and Tatsuo Hamano : ペットボトルと半透膜を用いた安価で簡便な藻類養殖法施肥具の開発, 日本応用藻類学会第19回大会, Sep. 2021.
29.	Naohiro Oka, 岡崎優太, 加藤慎治, 團昭紀 and Tatsuo Hamano : スジアオノリの成熟と窒素量との関係, 日本応用藻類学会第19回大会, Sep. 2021.
30.	Naohiro Oka, 福原萌香, 梅原大智 and Tatsuo Hamano : Agardhiella subulataの色調に与える培養環境の影響, 日本応用藻類学会第19回大会, Sep. 2021.
31.	梅原大智, Naohiro Oka, 福原萌香 and Tatsuo Hamano : 紅藻Agardhiella subulataの生長に対する光質の影響, 日本応用藻類学会第19回大会, Sep. 2021.
32.	Naohiro Oka, 児玉吉平 and Tatsuo Hamano : アサクサノリの量産化に向けた陸上養殖技術の開発, 日本応用藻類学会第19回大会, Sep. 2021.
33.	秋山智有, 乗岡尚子, Naohiro Oka, 伊佐治由貴, 仲庭哲津子, 東田怜, 田中秀明, 栗栖源嗣 and 藤井律子 : In-vitro reconstitution of light-harvesting complexes of a siphonous green alga, Codium fragile, 第62回日本植物生理学会年会, Mar. 2021.
34.	Naohiro Oka, Daichi Umehara, 佐藤陽一 and Tatsuo Hamano : 紅藻Agaldhiella subulataの生長に対する水温の影響, 日本藻類学会第44回大会, Mar. 2020.
35.	佐藤陽一, 及川浩生, 最上川美穂, 兼松宏一, 中裕之 and Naohiro Oka : 紅藻Agardhiella subulataの培養条件による形態および色調変化, 日本植物学会第83回大会, Sep. 2019.
36.	Naohiro Oka, 小川颯太, 岡本裕太, 齋藤稔, Tatsuo Hamano and 團昭紀 : 異なる塩分濃度下でのスジアオノリの生長, 日本応用藻類学会第18回大会, May 2019.
37.	Naohiro Oka, 渡邉立哉, 梅原大智 and Tatsuo Hamano : 海藻付着基としての繊維素材の評価, 日本応用藻類学会第18回大会, May 2019.
38.	Naohiro Oka, 岡本裕太, 小川颯太, 齋藤稔, Tatsuo Hamano and 團昭紀 : スジアオノリの生長に対する日長の影響, 日本応用藻類学会第18回大会, May 2019.
39.	Naohiro Oka, 山室達也, 村瀬昇 and Tatsuo Hamano : ワカメ幼胞子体の生長及び付着器形成に対する光波長の影響, 日本応用藻類学会第18回大会, May 2019.
40.	Naohiro Oka, 佐藤陽一, 中西達也, 團昭紀, 齋藤稔 and Tatsuo Hamano : 紅藻Agardhiella subulataの陸上養殖技術の開発, 日本藻類学会第42回大会, Mar. 2018.
41.	木下優太郎, 佐藤陽一, Naohiro Oka and 平岡雅規 : 有用海藻3種の栄養塩吸収特性, 日本藻類学会第42回大会, Mar. 2018.
42.	齋藤稔(徳島大学技術補佐員), Naohiro Oka and Tatsuo Hamano : 徳島県日和佐川におけるテナガエビ類による河床型の利用様式の比較, 日本甲殻類学会第55回大会, Oct. 2017.
43.	Naohiro Oka, 齋藤稔, 團昭紀, 佐藤陽一, 中西達也 and Tatsuo Hamano : 有用海藻Agardhiella subulataの生長性とその利用について, 日本応用藻類学会第16回大会, May 2017.
44.	Naohiro Oka, Hiroto Imai, Minoru Saito, 團昭紀, 棚田教生 and Tatsuo Hamano : ワカメ配偶体のフコキサンチン産生に対する水温の影響, 日本応用藻類学会第16回大会, May 2017.
45.	Fumiya Kita, 團昭紀, Naohiro Oka, 齋藤稔(技術補佐員) and Tatsuo Hamano : スジアオノリ陸上養殖のための組織培養を用いた種苗生産, 日本応用藻類学会第16回大会, May 2017.
46.	Naohiro Oka, 篠本聖太, 小川純司, 團昭紀, 齋藤稔(技術補佐員) and Tatsuo Hamano : 地下海水を用いた紅藻Agardhiella subulataおよび藻食性巻貝トコブシの複合養殖, 日本藻類学会第41回大会高知2017, Mar. 2017.
47.	喜多郁弥, 團昭紀, Naohiro Oka and Tatsuo Hamano : スジアオノリ陸上養殖のための組織培養を用いた種苗生産法の確立, 第3回日本生物工学会西日本支部講演会, Dec. 2016.
48.	Naohiro Oka, Takaiku Sakamoto, Eiji Sakuradani, 團昭紀 and Tatsuo Hamano : 有用海藻Agardhiella subulataの脂肪酸分析について, 第3回日本生物工学会西日本支部講演会, Dec. 2016.
49.	今井洋斗, 倭遼志, 小林大紀, 喜多郁弥, Naohiro Oka, 團昭紀, 齋藤稔, 松田春菜, 棚田教生, 岡崎孝博 and Tatsuo Hamano : 徳島県海部沿岸の漁業者が行う海藻の脱水・素干し・粉砕技術の開発, 日本応用藻類学会第15回大会, May 2016.
50.	小林大紀, Naohiro Oka, 團昭紀, 齋藤稔, 倭遼志, 今井洋斗, 喜多郁弥, 松田春菜, 棚田教生, 岡崎孝博 and Tatsuo Hamano : 徳島県美波町における海藻養殖漁業の六次産業化, 日本応用藻類学会第15回大会, May 2016.
51.	Naohiro Oka, 棚田教生, 團昭紀, Tatsuo Hamano, 小林大紀 and 今井洋斗 : 徳島県太平洋沿岸におけるワカメ養殖の実用化に向けた品種改良, 日本応用藻類学会第15回大会, May 2016.
52.	浦上千藍砂, Galzerano Dennis, Gall Andrew, 重松佑典, Meisterhans Maiwen, Naohiro Oka, 伊波匡彦, 藤井律子, Robert Bruno and 橋本秀樹 : 二種類の光条件下で培養した深所型緑藻モツレミル糸状体のラマン分光測定, 第27回カロテノイド研究談話会, Oct. 2013.
53.	重松佑典, 藤井律子, Naohiro Oka, 伊波匡彦 and 橋本秀樹 : 深所型緑藻の光合成アンテナ蛋白質の蛋白と色素の同定, 日本化学会第93春季年会, Mar. 2013.
54.	Naohiro Oka, 平良寛進, 楠本利行, 伊波匡彦, 重松佑典, 藤井律子 and 橋本秀樹 : モツレミル大量培養によるシフォナキサンチンおよびSCPの生産について, 第36回日本藻類学会, 2012.
55.	Naohiro Oka, 平良寛進, 伊波匡彦, 藤井律子 and 橋本秀樹 : 亜熱帯性緑藻の培養によるシフォナキサンチンの生産, 第25回カロテノイド研究談話会, Sep. 2011.
56.	Naohiro Oka, 飯沼喜朗 and 伊波匡彦 : 紅藻マクリ(Digenea simplex)の培養によるカイニン酸の生産について, Jun. 2009.
57.	Naohiro Oka, 平良寛進 and 伊波匡彦 : 室内培養下におけるオキナワモズク盤状体の成熟特性について, 第33回日本藻類学会, Mar. 2009.
58.	内村真之, E.J. Faye, Naohiro Oka, 宮崎勤, 市原健介 and 嶌田智 : 南西諸島海域で生育が確認されたミルモドキ属(Pseudocodium)など珍しい緑藻類について, 第33回日本藻類学会, Mar. 2009.
59.	Naohiro Oka and 川畑知子 : 室戸海洋深層水及び表層水を用いた褐藻類の生長特性の解明, 第9回海洋深層水利用研究会全国大会, Nov. 2005.
60.	Naohiro Oka, 平岡雅規, 川井唯史, 四ツ倉典滋 and 中明幸広 : 海洋深層水によるコンブ類とアワビの陸上タンク養殖システム, 第29回日本藻類学会, Mar. 2005.
61.	Naohiro Oka, 田村光政, 平岡雅規, 西島敏隆, 吉本典生 and 中田有樹 : 海洋深層水を用いたワカメとアワビの多段養殖, 第28回日本藻類学会, Mar. 2004.
62.	刈谷宣政, 平岡重道, 平岡雅規, Naohiro Oka, 嶌田智, 江端弘樹 and 浜田英之 : 室戸岬ではじまる海洋深層水を利用したアオノリ陸上タンク養殖について, 第28回日本藻類学会, Mar. 2004.
63.	江端弘樹, 嶌田智, 四ツ倉典滋, 平岡雅規, Naohiro Oka and 佐藤義夫 : 地下海水を利用した海藻陸上養殖事業の可能性, 第28回日本藻類学会, Mar. 2004.
64.	Naohiro Oka, 平岡雅規, 西島敏隆, 四ツ倉典滋 and 川北浩久 : 室戸海洋深層水と表層水を用いたホソメコンブ大量培養と藻体成分比較, 第7回海洋深層水利用研究会全国大会, Dec. 2003.
65.	川井唯史, Naohiro Oka, 平岡雅規 and 中明幸広 : ホソメコンブ配偶体の生長に及ぼす硝酸塩の影響, 平成15年度日本水産工学会学術講演会, May 2003.
66.	Naohiro Oka, 平岡雅規, 四ツ倉典滋, 西島敏隆 and 川井唯史 : 海洋深層水によるコンブ陸上タンク養殖-新しい食材としての利用-, 第27回日本藻類学会, Mar. 2003.
67.	平岡雅規 and Naohiro Oka : 室戸海洋深層水による筋アオノリ養殖事業化実証試験, 第6回海洋深層水利用研究会全国大会, Nov. 2002.
68.	Naohiro Oka, 平岡雅規 and 西島敏隆 : ワカメの配偶体成熟誘導と室戸海洋深層水を用いた屋外養殖, 第6回海洋深層水利用研究会全国大会, Nov. 2002.

Report:

1.	米澤孝康, 齋藤稔, 畑間俊弘, 荒木晶, Naohiro Oka and Tatsuo Hamano : 徳島県南部の河川の中・上流域におけるヌマエビ類のマイクロ生息場の環境選択性, 水産大学校研究報告, Vol.71, No.2, 43-55, Dec. 2022.
2.	Naohiro Oka, 池脇義弘, 上田幸男, 玉城泉也, 藤吉栄次 and 吉田吾郎 : 徳島県北部沿岸におけるアサクサノリの分布, 徳島県水産研究報告, No.14, 1-8, Dec. 2022.
3.	棚田教生, 中西達也, Naohiro Oka and Tatsuo Hamano : 海部郡でのワカメ類養殖の実用化に向けた超高温耐性品種及び養殖技術の開発, 徳島県立農林水産総合技術支援センター水産研究課事業報告書平成30年度, 44-45, Oct. 2019.
4.	棚田教生, 中西達也, 多田篤司, Naohiro Oka and Tatsuo Hamano : 海部郡でのワカメ類養殖の実用化に向けた超高温耐性品種及び養殖技術の開発, 徳島県立農林水産総合技術支援センター水産研究課事業報告書平成29年度, 77-78, Oct. 2018.
5.	棚田教生, Naohiro Oka and Tatsuo Hamano : 県南海域に適応した超高水温耐性ワカメ類養殖品種及び養殖技術の開発, 徳島県立農林水産総合技術支援センター水産研究課事業報告書平成28年度, 71-72, Oct. 2017.
6.	棚田教生, Naohiro Oka and Tatsuo Hamano : 徳島県太平洋沿岸由岐地先に適したワカメ養殖種苗の検討, 徳島県水研報, Vol.11, 25-30, Mar. 2017.
7.	棚田教生, Naohiro Oka and Tatsuo Hamano : 美波町由岐地区におけるワカメ養殖試験, 徳島県立農林水産総合技術支援センター水産研究課事業報告書平成27年度, 71-72, Oct. 2016.
8.	Naohiro Oka : 海洋深層水による褐藻類とアワビの集約的タンク養殖システムに関する研究, 高知大学海洋生物研究報告, Vol.24, 11-57, 2006.
9.	Naohiro Oka : 室戸海洋深層水による海藻とアワビの多段養殖, 高知県海洋深層水研究所報, Vol.7, 18-22, 2006.
10.	Naohiro Oka and 川北浩久 : 室戸海洋深層水による海藻の大量培養とアワビ複合養殖, 高知県海洋深層水研究所報, Vol.6, 80-85, 2004.
11.	大野正夫, 矢野誠, 平岡雅規, Naohiro Oka and 谷口道子 : 海洋深層水を用いた紅藻トゲキリンサイとトサカノリのタンク養殖, 高知大学海洋生物研究報告, Vol.20, 35-40, 2001.

Patent:

1.	橋本秀樹, 溝口律子, 伊波匡彦, Naohiro Oka and 楠本利行 : 色素結合型タンパク質およびその製造方法, 6142448 (May 2017).
2.	伊波匡彦, Naohiro Oka and 平良寛進 : シフォナキサンチンおよび/またはシフォネインの製造方法, 5804319 (Sep. 2015).
3.	伊波匡彦, Naohiro Oka and 飯沼喜朗 : マクリの培養方法, 5699411 (Feb. 2015).
4.	伊波雅彦, Naohiro Oka and 飯沼喜朗 : カイニン酸の製造方法, 5228233 (2013).
5.	伊波匡彦, Naohiro Oka and 平良寛進 : フコキサンチンおよび/またはフコステロールの製造方法, 4870787 (2011).
6.	Naohiro Oka, 藤川康夫, 鶴本智大 and ONODA Yushi : 経口組成物，およびその製造方法, (Oct. 2024), (Apr. 2026), 2024-192011.
7.	Naohiro Oka and Tatsuo Hamano : 紅藻の黄色藻体の製造方法, 2019-089434 (Apr. 2019), (Oct. 2020), 7258342 (Apr. 2023).
8.	團昭紀 and Naohiro Oka : アオサ目またはヒビミドロ目に属する緑藻類の種苗生産方法及び当該種苗を利用した緑藻類の養殖方法, (Aug. 2016), 6861979 (Apr. 2021).

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

Elucidation of the novel non photochemical quenching by in vitro reconstitution of light-harvesting complex with carbonyl carotenoids. (Project/Area Number: 23K05721 )
Search by Researcher Number (30513270)

Associate Professor : Oka, Naohiro

Research

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Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)