研究者詳細 - 髙山　佳樹

論文 - 髙山　佳樹

件数 20 件

A novel stepwise salinity acclimation method to improve the survival of freshwater microalgae Haematococcus lacustris in seawater salinity

Qianyi Gu, Yoshiki Takayama, Noriaki Natori, Minamo Hirahara, Anupreet Kaur Chowdhary & Tatsuki Tod … 全著者表示

Bioprocess and Biosystems Engineering 48 43 - 52 2024年9月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）共著

海産カイアシ類Pseusodiaptomus nihonkaiensisの培養における微細藻類餌料の検討

髙山佳樹、古閑伸一、戸田龍樹

プランクトン工学研究 4 2024年6月

担当区分：筆頭著者,　責任著者記述言語：日本語掲載種別：研究論文（大学，研究機関紀要）単著

Observation of a coccolithophore Gephyrocapsa oceanica bloom in the temperate coastal waters of Sagami Bay, Japan

Yano Koichi, Takayama Yoshiki, Shimode Shinji, Toratani Mitsuhiro, Murakami Hiroshi, Kuwahara Victo … 全著者表示

Plankton and Benthos Research 19 ( 1 ) 37 - 50 2024年2月

DOI Web of Science CiNii Research

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：日本プランクトン学会、日本ベントス学会共著

In mid-May 2020, a coccolithophore bloom of Gephyrocapsa oceanica Kamptner, 1943 was observed in Sagami Bay, Japan, possibly for the first time in 25 years. This species is a common yet elusive taxon in the waters around Japan, but there has only been one report of a bloom observation in Sagami Bay in 1995. The G. oceanica bloom in 2020 was observed by the combined approach of the JAXA ocean color remote sensing satellite “Shikisai” and field surveys. The true-color RGB images from the satellite showed the initial bloom in Tokyo Bay appears to have advected into Sagami Bay on May 5. On May 15, ad hoc field sampling was conducted based on visual confirmation from the shore. Nitrate, nitrite and phosphate concentrations at the sea surface were 3.28 µM, 0.11 µM and 0.29 µM, respectively, and higher than the median of May from 1997 to 2019. Chlorophyll a concentration was 2.23 µg L−1 at the sea surface, and cell density was 5.3 × 103 cells mL−1. The large bloom appears to have reached the western shorelines of the bay, and dispersed counterclockwise within the bay. The bloom reached an estimated 1119.02 km2 surface expression on May 17, and completely disappeared by May 24. Further, the median value of 19′-hexanoyloxyfucoxanthin (a signature pigment of haptophytes, including coccolithophores) concentration has been increasing from 2017 to 2020, and the coastal area of Sagami Bay may have changed to a region favorable for haptophytes.

Can the culture density of the marine copepod Pseudodiaptomus nihonkaiensis be improved by installing an artificial substrate?

Shinichi Koga, Yoshiki Takayama, Tatsuki Toda

Aquaculture Studies 2024年 [査読有り]

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

Energy-saving in fucoxanthin production by Chaetoceros gracilis in a flat-bag photobioreactor with intermittent mixing

Masashi Fujii, Yoshiki Takayama, Yuki Imaizumi, Fatimah Md Yusoff, Koichi Yago, Norio Nagao, Abd Wa … 全著者表示

Biocatalysis and Agricultural Biotechnology 50 102693 - 102693 2023年7月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

Practical Science and Environmental Education Workshop in Manaus, Brazil

Shinjiro Sato, Paulo H.R. Aride, Luciano G. do Nascimento, Victor S. Kuwahara, Yoshiki Takayama, Ko … 全著者表示

プランクトン工学研究 3 51 - 61 2023年6月

記述言語：英語掲載種別：研究論文（大学，研究機関紀要）単著

その他リンク： https://www.soka.ac.jp/perc/bper/vol3

Effects of organic carbon sources on algal biofilm formation and insight into mechanism

Jun Qian, Siyi Fu, Jingjing Li, Tatsuki Toda, Hongwu Li, Mutsumi Sekine, Yoshiki Takayama, Shinichi … 全著者表示

Algal Research 71 2023年4月

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

その他リンク： https://www.sciencedirect.com/science/article/pii/S221192642300108X

Insight into the formation mechanism of algal biofilm in soy sauce wastewater

Jun Qian, Ting Wan, Yuxin Ye, Jingjing Li, Tatsuki Toda, Hongwu Li, Mutsumi Sekine, Yoshiki Takayam … 全著者表示

Journal of Cleaner Production 394 2023年3月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

その他リンク： https://www.sciencedirect.com/science/article/pii/S0959652623003372

Evaluation of Microalgal Diet to Culture Adult Oithona oculata Farran (Copepoda, Cyclopoida)

Yoshiki Takayama, Taisei Yamasaki, Tatsuki Toda

AQUACULTURE RESEARCH 2023 1 - 7 2023年2月 [査読有り]

DOI

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

その他リンク： https://www.hindawi.com/journals/are/2023/2089803/

Enhancing biomass yield, nutrient removal, and decolorization from soy sauce wastewater using an algae-fungus consortium

Hanwu Song, Jun Qian, Liangliang Fan, Tatsuki Toda, Hongwu Li, Mutsumi Sekine, Peixue Song, Yoshiki … 全著者表示

Algal Research 68 2022年11月 [査読有り]

DOI

記述言語：英語掲載種別：研究論文（学術雑誌）単著

その他リンク： https://www.sciencedirect.com/science/article/pii/S2211926422002491

Evaluation of dietary microalgae in the culture of Acartia steueri (copepoda, calanoida)

TAKAYAMA YOSHIKI, MD. YUSOFF FATIMAH, TODA TATSUKI

Journal of Sustainability Science and Management 18 186 - 198 2022年9月 [査読有り]

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）単著

その他リンク： https://ppsms.umt.edu.my/wp-content/uploads/sites/51/2023/07/JSSM-V18-N17-Article-12-Draf-1-compressed.pdf

浮遊性カイアシ類Acartia steueriの幼生・幼体の培養における微細藻類餌料の検討

髙山佳樹, 平原南萌, 戸田龍樹

プランクトン工学研究 ( 2 ) 32 - 43 2022年6月

CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：創価大学プランクトン工学研究所共著

In aquaculture and ornamental industries, copepods are recognized as preferred live feeds for marine fish larvae over commonly used organisms such as Artemia and rotifers. Marine fish larvae fed with copepods show better survival and growth. Despite obvious advantages of copepods as the live feed, their use is still limited owing to low productivity and cost-efficiency when mass cultivated.
Copepods from the genus Acartia are good candidates for a live feed because their body size, swimming behavior, and biochemical composition are suitable for many marine fish larvae which have small mouth gapes. In addition, Acartia species produce dormant eggs which can be stored and hatched to feed fish larvae. Acartia steueri Smirnov is widely distributed in the coastal waters of the western Pacific Ocean, and is an essential food source for the larvae of commercially important fish in their natural habitats.
Different dietary microalgae affect the egg production rate, hatching success, survival rate, growth rate, and the population growth of copepods. One of the underlying bottlenecks in the intensive cultivation of copepods is fatally low survival rate during their larval stages. Calanoid copepods including genus Acartia feed on live microalgae. In the present study, in order to clarify the favorable dietary microalgae for larvae of Acartia steueri, the nauplii individuals were fed with four mono-microalgal diets and one mixed-microalgal diet to measure their survival rate.
The present study conducted two experiments. In the first experiment, the nauplii hatched within 24 hours were individually reared in 6-well plates under three diet conditions (mono-diet of Tetraselmis suecica, Rhodomonas salina and Isochrysis galbana) in April 2019. Survival rate and development stages of the copepods were measured every two days. In the second experiment, the nauplii were reared in 600 mL beakers under three diet conditions (mono-diet of T. suecica, Chaetoceros gracilis, and a mixed diet of T. suecica + C. gracilis at 1:1 carbon ratio) in April 2020. Survival rate and development stages of the copepods were measured at day 10 and day 20 during the incubation duration.
In the first experiment, the survival rate at day 20 was 26.8 ± 7.2％ when fed with T. suecica, which was the highest value among the mono-microalgal diet conditions. However, only 0.6％ of individuals fed with T. suecica were developed to the adult stage (copepodid VI). In addition, the malformation at first antennas was observed from the copepodid individuals fed with T. suecica. T. suecica is well known to be rich in amino acids but with poor fatty acid content. These results might suggest that T. suecica is the favorable diet for early developmental stages (i.e. nauplii) of the copepod A. steueri, but has a nutritional problem for the later development stages of life cycle. In the second experiment, the ratio of individuals developed until adult stages was maximized under the mixed diet condition of T. suecica and C. gracilis, and this mixed diet can be considered a favorable diet for A. steueri larvae in the present study.

カイアシ類1個体からのDNA抽出方法の改良とホルマリン固定期間がミトコンドリア遺伝子のPCR増幅に与える影響

小林真輝, 髙山佳樹, 下出信次, 戸田龍樹, 黒沢則夫

プランクトン工学研究 2 56 - 65 2022年6月

記述言語：日本語掲載種別：研究論文（大学，研究機関紀要）単著

その他リンク： https://www.soka.ac.jp/perc/bper/vol2

浮遊性カイアシ類Acartia steueriの幼生・幼体の培養における微細藻類餌料の検討

髙山佳樹, 平原南萌, 戸田龍樹

創価大学プランクトン工学研究 = Soka University bulletin of plankton eco-engineering research ( 2 ) 32 - 43 2022年6月

CiNii Research

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：八王子 : 創価大学プランクトン工学研究所 = Institute of Plankton Eco-Engineering 共著

Suppression of cannibalism in the intertidal copepod Tigriopus japonicus (Mori, 1932) and improvements in population density using artificial substrates

Shinichi Koga, Yoshiki Takayama, Tatsuki Toda