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Okinawa Churashima RESEARCH CENTER

Research on marine organisms

Research staff profile

Ryo Nozu

Ryo Nozu, Ph.D.

(Research Scientist)

Area of expertise Reproductive physiology on fishes
Research content Reproductive physiology on chondrichthian fishes (sharks and rays)
Sexual plasticity and sex change in fishes

Background

  • 2007 - Bachelor of Science (Biology), University of the Ryukyus, Japan
  • 2009 - Master of Science (Biology), University of the Ryukyus, Japan
  • 2012 - Doctor of Science, University of the Ryukyus, Japan
  • 2012 - Post-doctoral Fellow, University of the Ryukyus
  • 2012 - Visiting researcher, of Texas State University
  • 2013 - Post-doctoral Fellow, Meio University
  • 2014 - Current post at the Okinawa Churashima Foundation Research Center

Essay, Report

  • Nozu R*, Murakumo K, Yano N, Furuyama R, Matsumoto R, Yanagisawa M, Sato K, Changes in sex steroid hormone levels reflect the reproductive status of captive female zebra sharks (Stegostoma fasciatum). General and Comparative Endocrinology, in press
  • Horiguchi R, Nozu R*, Hirai T, Kobayashi Y, Nakamura M, Expression patterns of sex differentiation-related genes during gonadal sex change in the protogynous wrasse, Halichoeres trimaculatus. General and Comparative Endocrinology, 257:67-73, 2018
  • Nozu R*, Murakumo K, Matsumoto R, Matsumoto Y, Yano N, Nakamura M, Yanagisawa M, Ueda K, Sato K, High-resolution monitoring from birth to sexual maturity of a male reef manta ray, Mobula alfredi, held in captivity for 7 years: changes in external morphology, behavior, and steroid hormones levels. BMC Zoology, 2:14, 2017
  • Tomita T*, Nozu R, Nakamura M, Matsuzaki S, Miyamoto K, Sato K, Live-bearing without placenta: Physical estimation indicates the high oxygen-supplying ability of white shark uterus to the embryo. Scientific Reports, 7:11744, 2017
  • Tomita T*, Miyamoto K, Kawaguchi A, Toda M, Oka S, Nozu R, Sato K, Dental ontogeny of a white shark embryo. Journal of Morphology, 278: 215-227, 2017
  • Kobayashi Y*, Nozu R, Nakamura M, Expression and Localization of two gonadotropin receptors in gonads of the yellowtail clownfish, Amphiprion Clarkii. Journal of Aquaculture & Marine Biology, 5:00120, 2017
  • Sato K*, Nakamura M, Tomita T, Toda M, Miyamoto K, Nozu R. How great white sharks nourish their embryos to a large size: evidence of lipid histotrophy in lamnoid shark reproduction. Biology Open, 5: 1211-1215, 2016
  • Nakamura M*, Miura S, Nozu R, Kobayashi Y. Opposite-directional sex change in functional female protandrous anemonefish, Amphiprion clarkii: Effect of aromatase inhibitor on the ovarian tissue. Zoological Letters, 1:30, 2015
  • Nozu R*, Horiguchi R, Kobayashi Y, Nakamura M. Expression profile of doublesex/male abnormal-3-related transcription factor-1 during gonadal sex change in the protogynous wrasse, Halichoeres trimaculatus. Molecular Reproduction and Development. 82: 859-866, 2015
  • Nakamura M*, Nozu R, Ijiri S, Kobayashi T, Hirai T, Yamaguchi Y, Seale A, Lerner T D, Grau E G. Sexual characteristics of high-temperature sterilized male Mozambique tilapia, Oreochromis mossambicus. Zoological Letters, 1:21, 2015
  • Nozu R*, Murakumo K, Matsumoto R, Nakamura M, Ueda K, Sato K. Gonadal morphology, histology, and endocrinological characteristics of immature female whale sharks, Rhincodon typus. Zoological Science, 32: 455-458, 2015
  • Nozu R*, Nakamura M. Cortisol administration induces sex change from ovary to testis in the protogynous wrasse, Halichoeres trimaculatus. Sexual Development, 9: 118-124, 2015
  • Kobayashi Y*, Nozu R, Horiguchi R, Nakamura M. Histological observation of doublesex-mab 3-related transcription factor 1 (DMRT1) localization in the adult testis of three-spot wrasse. International Aquatic research, 6: 68, 2014
  • Horiguchi R*, Nozu R, Hirai T, Kobayashi Y, Nagahama Y, Nakamura M. Characterization of gonadal soma-derived factor expression during sex change in the protogynous wrasse, Halichoeres trimaculatus. Developmental Dynamics, 242: 388-399, 2013
  • Nozu R*, Horiguchi R, Murata R, Kobayashi Y, Nakamura M. Survival of ovarian somatic cells during sex change in the protogynous wrasse, Halichoeres trimaculatus. Fish Physiology and Biochemistry, 39: 47-51, 2013
  • Kobayashi Y*, Nozu R, Nakamura M. Role of estrogen in spermatogenesis in initial phase males of the three-spot wrasse (Halichoeres trimaculatus): effect of aromatase inhibitor on the testis. Developmental Dynamics, 240: 116-121, 2011
  • Kobayashi Y*, Horiguchi R, Nozu R, Nakamura M. Expression and localization of forkhead transcriptional factor 2 (Foxl2) in the gonads of protogynous wrasse, Halichoeres trimaculatus. Biology of sex differences, 1:3, 2010
  • Nozu R*, Kojima Y, Nakamura M. Short term treatment with aromatase inhibitor induces sex change in the protogynous wrasse, Halichoeres trimaculatus. General and Comparative Endocrinology, 161: 360-364, 2009

Affiliated academic society

  • The Zoological Society of Japan
  • The Japanese Society of Fisheries Science
  • The Japan Society for Comparative Endocrinology

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