Updated on 2021/04/05

写真a

 
ANRAKU Kazuhiko
 
Organization
Research Field in Fisheries, Agriculture, Fisheries and Veterinary Medicine Area Faculty of Fisheries Department of Fisheries Science and Technology Professor
Research Field in Fisheries, Agriculture, Fisheries and Veterinary Medicine Area United Graduate School of Agricultural Sciences
Title
Professor

Degree

  • 博士(水産学) ( 1998.12   北海道大学 )

  • 水産学修士 ( 1994.3   鹿児島大学 )

  • 水産学 ( 1991.3   鹿児島大学 )

Research Interests

  • Fish behavior to fishing gear

  • Electrophysiology

  • Sensory biology of aquatic animals

  • 漁具漁法学

  • 応用行動生理学

  • Sensory physiology in aquatic animals

  • Fishing Gear and Technology

  • APPLIED ETHOLOGY

Research Areas

  • Others / Others  / 魚具漁法学

  • Others / Others  / 感覚生理学

  • Others / Others  / 応用行動生理学

  • Life Science / Aquatic bioproduction science

Research History

  • Kagoshima University   Research Field in Fisheries, Agriculture, Fisheries and Veterinary Medicine Area United Graduate School of Agricultural Sciences

    2018.10

  • Kagoshima University   Research Field in Fisheries, Agriculture, Fisheries and Veterinary Medicine Area Faculty of Fisheries Department of Fisheries Science and Technology   Professor

    2018.10

  • Kagoshima University   Research Field in Fisheries, Agriculture, Fisheries and Veterinary Medicine Area Faculty of Fisheries Department of Fisheries Science and Technology   Research Assistant

    1995.2 - 1999.3

Professional Memberships

  • アジア水産学会

    2015.10

  • 日本味と匂学会

    2015.10

  • 日本水産学会

    2015.10

  • 日本味と匂学会

  • 日本動物学会

  • 日本水産学会

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Papers

  • Oki Hayasaka, Kazuhiko Anraku, Yuya Akamatsu, Yung Che Tseng, Miguel Vazquez Archdale, Tomonari Kotani .  Threshold and spectral sensitivity of vision in medaka Oryzias latipes determined by a novel template wave matching method .  Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology251   110808 - 110808   2021.1

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    © 2020 Elsevier Inc. We propose a new analytical method for determining the response threshold in electroretinogram (ERG) in which the wave shows a biphasic slow dc-potential shift. This method uses the recorded wave to the highest intensity stimuli in each wavelength tested as a template wave f(t), and it was compared with other recorded waves obtained under lower intensities g(t). Our test recordings in medaka Oryzias latipes were analogous between the template and the compared waveforms, although there were differences in amplitude and time lag (τ, peak time difference) which occurred as a result of the difference in stimulus intensity. Cross-correlation analysis was applied. Based on the obtained cross-correlation function Cfg(τ) in each comparison, τ was determined as the time lag at which the cross-correlation coefficient Rfg(τ) showed the maximum value. Determined thresholds that were based on both the experimenter's visual inspection and this new method agreed well when the adoption condition was set to satisfy R(τ) ≥ 0.7 and τ ≤ 150 ms in scotopic or τ ≤ 120 ms in photopic conditions. We concluded that this “template wave matching method” is a quick and reliable objective assessment that can be used to determine the threshold. This study analyzed ERG recordings in response to 6 kinds of wavelength light stimuli (380 nm to 620 nm) at different photon flux densities. We report the threshold levels and relative spectral sensitivities in scotopic and photopic vision of medaka.

    DOI: 10.1016/j.cbpa.2020.110808

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  • Oki Hayasaka, Yutaka Takeuchi, Kazuhiro Shiozaki, Kazuhiko Anraku, Tomonari Kotani .  Green light irradiation during sex differentiation induces female-to-male sex reversal in the medaka Oryzias latipes .  Scientific Reports9 ( 1 ) 2383 - 2383   2019.12

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    Publisher:NATURE PUBLISHING GROUP  

    © 2019, The Author(s). This study investigated whether irradiation of a specific light wavelength could affect the sex differentiation of fish. We first found that the photoreceptor genes responsible for receiving red, green, and ultraviolet light were expressed in the eyes of medaka during the sex differentiation period. Second, we revealed that testes developed in 15.9% of genotypic females reared under green light irradiation. These female-to-male sex-reversed fish (i.e. neo-males) showed male-specific secondary sexual characteristics and produced motile sperm. Finally, progeny tests using the sperm of neo-males (XX) and eggs of normal females (XX) revealed that all F1 offspring were female, indicating for the first time in animals that irradiation with light of a specific wavelength can trigger sex reversal.

    DOI: 10.1038/s41598-019-38908-w

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  • Hideaki Matsui, Kazuhiko Anraku, Tomonari Kotani .  Spectrophotometry can monitor changes in algal metabolism triggered by nutrient deficiency in Nannochloropsis oculata cultured under various light-emitting diode light regimes .  Fisheries Science85 ( 1 ) 167 - 176   2019.1

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    Publisher:SPRINGER JAPAN KK  

    © 2018, Japanese Society of Fisheries Science. Efficient production of beneficial metabolites by microalgae using light-emitting diodes (LED) is attracting more interest. In batch cultures, metabolic changes that occur with nutrient deficiency over time must be monitored to estimate the metabolite content. Our previous study showed that nutrient deficiency in Nannochloropsis oculata can be briefly evaluated by measuring the absorption ratio at 490 and 680 nm (Abs 490 /Abs 680 ). However, little is known about the relation with this ratio and metabolic change, particularly in LED light-conditioned cultures. In this study, we investigate if Abs 490 /Abs 680 can be an indicator of the biochemical status of N. oculata cultured under various LED color regimes. Three LED treatments were used: Blue (B), Blue + Red (BR), and Red (R). In all LED treatments, the Abs 490 /Abs 680 decreased for several days and then increased when phosphate was limited or non-existent. The trends in the C16:0 and C20:5ɷ3 proportions and chlorophyll a content commonly changed at the turning points of the Abs 490 /Abs 680 . Furthermore, significant correlations were found among the metabolic state and absorption ratio, except in treatment R. We suggest that spectrophotometry can be used for monitoring metabolic changes in N. oculata cultures under various LED irradiance, unless there is excessive 630 nm-red light exposure.

    DOI: 10.1007/s12562-018-1261-y

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  • Nai Han Tan, Yukinori Mukai, Ryo Okawa, Kazuhiko Anraku .  Visual pigments and spectral sensitivity of juvenile sutchi catfish (Pangasianodon hypophthalmus Sauvage 1878) .  Journal of Applied Ichthyology34 ( 6 ) 1314 - 1319   2018.12

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    Publisher:WILEY  

    © 2018 Blackwell Verlag GmbH Knowledge on the visual spectral sensitivity of a given fish is important for determination of optimal light conditions for improvement of fish rearing in aquaculture. Sutchi catfish (Pangasianodon hypophthalmus Sauvage 1878) is an important freshwater fish species in Southeast Asia. The present study aimed to understand the visual spectral sensitivity of juvenile sutchi catfish through spectrophotometric measurement of the spectral absorbance of wholemounts of retinae. The spectral absorbance curves obtained from the spectrophotometric measurement indicated a parabolic shape. The curves for retinae photo-bleached with initial flash of blue, green and yellow lights, respectively had a peak at approximately 560 nm, which were the same as the curve for retinae photo-bleached with broad wavelength light. On the other hand, the curve for retinae photo-bleached with initial flash of red light had a peak shifted prominently toward shorter light wavelength at approximately 540 nm. This prominent shift of peak implied that the retinae of juvenile sutchi catfish absorb light wavelength of red. Therefore, the present results clearly suggested that juvenile sutchi catfish utilises longer light wavelengths.

    DOI: 10.1111/jai.13792

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  • Harold Monteclaro, Gerald Quinitio, Alan Dino Moscoso, Ruby Napata, Liberty Espectato, Kazuhiko Anraku, Kazuo Watanabe, Satoshi Ishikawa .  Impacts of Typhoon Haiyan on Philippine capture fisheries and implications to fisheries management .  Ocean and Coastal Management158   128 - 133   2018.5

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    Publisher:ELSEVIER SCI LTD  

    © 2018 Elsevier Ltd With New Washington-Batan estuary as study site, this study determined the impact of Typhoon Haiyan on capture fisheries through data that were collected before and after the typhoon event. To validate these results and to determine other related information (e.g., recovery of fishing after typhoon), key interviews and focus group discussions were conducted. The immediate impact of the typhoon event was disruption of fishing livelihood due to damage of fishing gears as about 94% of stationary fishing gears had considerable damage. Resumption of fishing operations varied largely among fishers depending on the degree of gear damage. Reconstruction of damaged stationary gears was hampered mainly by the financial capacity of fishers and the acute supply of bamboo which is the main component in the construction of these fishing gears. We also discuss typhoon impacts on other fishing gears such as line fishing, gillnets, and pots. These information are valuable in understanding impacts of extreme weather events on tropical small-scale fisheries so that managers may be able to devise measures to reduce vulnerabilities among coastal resource users.

    DOI: 10.1016/j.ocecoaman.2018.03.032

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  • Mitsunaga Yasushi, Endo Chikayuki, Anraku Kazuhiko, Selorio Jr. Cornelio M., Babaran Ricardo P. .  Association of early juvenile yellowfin tuna <i>Thunnus albacares</i> with a network of payaos in the Philippines .  NIPPON SUISAN GAKKAISHI84 ( 4 ) 589 - 589   2018

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    Publisher:The Japanese Society of Fisheries Science  

    DOI: 10.2331/suisan.h29-102

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  • Hao Yi Chang, Tzu Hao Lin, Kazuhiko Anraku, Yi Ta Shao .  The effects of continuous acoustic stress on ros levels and antioxidant-related gene expression in the black porgy (Acanthopagrus schlegelii) .  Zoological Studies57   e59   2018

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    Publisher:BIODIVERSITY RESEARCH CENTER, ACAD SINICA  

    © 2018 Academia Sinica, Taiwan. Hao-Yi Chang, Tzu-Hao Lin, Kazuhiko Anraku, and Yi Ta Shao (2018) Short-term exposure to strong underwater noise is known to seriously impact fish. However, the chronic physiological effects of continuous exposure to weak noise, i.e. the operation noise from offshore wind farms (OWF), remain unclear. Since more and more OWF will be built in the near future, their operation noise is an emerging ecological issue. To investigate the long-term physiological effects of such underwater noise on fish, black porgies (Acanthopagrus schlegelii) were exposed to two types of simulated wind farm noise—quiet (QC: 109 dB re 1 μPa / 125.4 Hz; approx. 100 m away from the wind turbine) and noisy (NC: 138 dB re 1 μPa / 125.4 Hz; near the turbine)—for up to 2 weeks. Measurement of auditory-evoked potentials showed that black porgies can hear sound stimuli under both NC and QC scenarios. Although no significant difference was found in plasma cortisol levels, the fish under NC conditions exhibited higher plasma reactive oxygen species (ROS) levels than the control group at week 2. Moreover, alterations were found in mRNA levels of hepatic antioxidant-related genes (sod1, cat and gpx), with cat downregulated and gpx upregulated after one week of QC exposure. Our results suggest that the black porgy may adapt to QC levels of noise by modulating the antioxidant system to keep ROS levels low. However, such antioxidant response was not observed under NC conditions; instead, ROS accumulated to measurably higher levels. This study suggests that continuous OWF operation noise represents a potential stressor to fish. Furthermore, this is the first study to demonstrate that chronic exposure to noise could induce ROS accumulation in fish plasma.

    DOI: 10.6620/ZS.2018.57-59

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  • Hideaki Matsui, Ryo Okawa, Kazuhiko Anraku, Tomonari Kotani .  Application of spectrophotometry to estimate the optimum culture conditions for Nannochloropsis oculata as a diet for zooplankton .  Aquaculture Science65 ( 3 ) 209 - 219   2017

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    © 2017 Japanese Society for Aquaculture Research, Nishimura Toushadou Ltd. All rights reserved. Counting cells is a difficult way to estimate the optimum culture conditions for Nannochloropsis oculata as a feed for rotifers efficiently. To devise a simple tool that could be used quickly to estimate the optimum harvest time using spectrophotometry, we investigated the relationship between N. oculata growth population patterns, absorption spectra and nutrient salt concentrations. The cell densities, absorption values at each wavelength (360-780 nm) and concentrations of nitrate-nitrogen and phosphate were measured daily. The logarithmic phase was terminated just before phosphate limitation. The absorption ratio of 490 nm per 680 nm increased until the start of the logarithmic phase, continued to decrease beyond the logarithmic phase and then increased again just after phosphate starvation. The cells reached a stationary phase after additional nitrate-nitrogen starvation. These results suggest that absorption spectra change the trend gradually in response to nutrient salt starvation rather than to growth phase transition. The present study suggests, the possibility of applying spectrophotometry to monitor N. oculata culture conditions more accurately than the cell count method allows.

    DOI: 10.11233/aquaculturesci.65.209

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Books

Presentations

  • 瀬戸 祥太, 内匠 正太, 塩崎 一弘, 安樂 和彦, 小松 正治   細胞の酸化ストレス抵抗性を賦与するウナギ緑色蛍光タンパク質eeIGFP  

    中毒研究  2020.9  (株)へるす出版

Works

  • Research on Artificial Fish Behavior Control technology

    2000

  • Research on Development of Fishing Gear using Artificial Sensory Stimuli

    2000

Research Projects

  • 魚類の聴覚に関する研究

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  • 魚類の側線に関する研究

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  • 頭足類の化学感覚と行動

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  • 水生生物の行動制御技術開発に関する研究

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  • Study on the Lateral Line of Fish

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  • Study on the Hearing in Fish

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  • Chemoreception and Behavior in Cephalopod

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