Yoichi Sakai

Last Updated :2019/12/02

Affiliations, Positions
Graduate School of Integrated Sciences for Life, ., Professor
E-mail
sakai41hiroshima-u.ac.jp
Self-introduction
Behavioral ecology of fishes Underwater survey for behavioral study Mating systems, sex change tactics, and reproductive strategies in fishes

Basic Information

Academic Degrees

  • Doctor (Science), Osaka City University
  • Master of Science, Osaka City University

Research Fields

  • Agricultural sciences;Applied aquatic science;Aquatic bioproduction science
  • Biology;Basic biology;Ecology / Environment

Research Keywords

  • Sex change
  • Reproductive strategies
  • Foraging ecology
  • Alternative tactics
  • Fish Biology
  • Mating systems
  • Behavioral Ecology of Reef Fishes

Affiliated Academic Societies

  • Japan Ethological Society, 1990
  • The Ichthyological Society of Japan, 1993
  • *, 2001

Educational Activity

Course in Charge

  1. 2019, Liberal Arts Education Program1, 1Term, Life, food, and environmental sciences
  2. 2019, Liberal Arts Education Program1, 3Term, Sport fishing and science: fishes-human beings interactions
  3. 2019, Undergraduate Education, 2Term, Introduction to Biological Science of Animal Production and Fishery
  4. 2019, Undergraduate Education, 1Term, Statistics in Biology
  5. 2019, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  6. 2019, Undergraduate Education, 1Term, Introduction to Applied Biological Sciences
  7. 2019, Undergraduate Education, Intensive, Laboratory Work in General Biology I
  8. 2019, Undergraduate Education, Intensive, Laboratory Work in General Biology II
  9. 2019, Undergraduate Education, Intensive, Field Works and Experiments of Marine Fisheries Science in "Sato Umi"the Seto Inland Sea
  10. 2019, Undergraduate Education, Academic Year, Graduation Thesis
  11. 2019, Undergraduate Education, 1Term, Behavioral Ecology of Fish
  12. 2019, Undergraduate Education, Intensive, (AIMS) Fish Production
  13. 2019, Undergraduate Education, 3Term, Fish Production
  14. 2019, Graduate Education (Doctoral Program) , First Semester, Exercises in Aquatic Biology(B)
  15. 2019, Graduate Education (Doctoral Program) , Second Semester, Exercises in Aquatic Biology(B)
  16. 2019, Graduate Education (Master's Program) , First Semester, Practice in Aquatic Biology
  17. 2019, Graduate Education (Master's Program) , 3Term, Fish Sociobiology: introduction
  18. 2019, Graduate Education (Master's Program) , 3Term, Fish Sociobiology: advance
  19. 2019, Graduate Education (Master's Program) , Second Semester, Research for Academic Degree Dissertation
  20. 2019, Graduate Education (Master's Program) , 3Term, Research Methods in Life Science
  21. 2019, Graduate Education (Master's Program) , 1Term, Exercises in Bioresource Science A
  22. 2019, Graduate Education (Master's Program) , 2Term, Exercises in Bioresource Science A
  23. 2019, Graduate Education (Master's Program) , 3Term, Exercises in Bioresource ScienceB
  24. 2019, Graduate Education (Master's Program) , 4Term, Exercises in Bioresource ScienceB
  25. 2019, Graduate Education (Master's Program) , Academic Year, Research for Academic Degree Dissertation in Bioresource Science
  26. 2019, Graduate Education (Master's Program) , Academic Year, Research for Academic Degree Dissertation in Bioresource Science
  27. 2019, Graduate Education (Master's Program) , 1Term, Fish Biology and Fisheries I
  28. 2019, Graduate Education (Master's Program) , 3Term, Fish Biology and Fisheries II

Research Activities

Academic Papers

  1. Anti-egg predator behaviors of the small angelfish Centropyge ferrugatus (Pomacanthidae)., Environmental Biology of Fishes, 43, 401-405, 19950401
  2. Fecundity of female angelfish, Centropyge ferrugatus, independent of body size: field collection of spawned eggs., Ichthyological Research, 43(2), 186-189, 19960401
  3. Harem structure of the protogynous angelfish, Centropyge ferrugatus (Pomacanthidae)., Environmental Biology of Fishes, 49, 333-339, 19970401
  4. Alternative spawning tactics of female angelfish according to two different contexts of sex change., Behavioral Ecology, 8(4), 372-377, 19970401
  5. Female-female spawning and sex change in a haremic coral-reef fish, Labroides dimidiatus., Zoological Science, 17, 967-970, 20000401
  6. Predation risk affects female choice opportunity in a coral reef fish., Journal of Ethology, 18, 109-114, 20000401
  7. Spawning timing of the cleaner wrasse, Labroides dimidiatus in a warm temperate rocky shore., Ichthyological Research, 48, 23-30, 20010401
  8. Effect of changing harem on timing of sex change in female cleaner fish Labroides dimidiatus., Animal Behaviour, 62, 251-257, 20010401
  9. Fish-egg predation by the small clingfish Pherallodichthys meshimaensis (Gobiesocidae) on the shallow reefs of Kuchierabu-jima Island, southern Japan, Environmental Biology of Fishes, 73, 237-242, 20050401
  10. Foraging behavior and diet composition of Trimma caudomaculata and T. caesiura (Gobiidae) on coral reefs in Okinawa, Japan, Ichthyological Research, 52, 302-305, 20050401
  11. Phylogenetic analysis among populations of the ocean sunfish Mola mola (Molidae) around the Japan coast, based on the mitochondrial DNA sequences., 13, 171-174, 20050401
  12. Comparative allometric growth of the mimetic ephippid reef fishes Chaetodipterus faber and Platax orbicularis, PLOS ONE, 10(12), 20151202
  13. Emergence behavior of a tide pool fish Praealticus tanegasimae (Teleostei; Blenniidae) on subtropical reefs, Journal of Ethology, 34(2), 175-181, 20160305
  14. Modeling spawning strategy for sex change under social control in haremic angelfishes., Behavioral Ecology, 13(1), 75-82, 20020401
  15. Reversed sex-change in the protogynous reef fish, Labroides dimidiatus., Ethology, 108, (443-450), 20020401
  16. Status-dependent behavioural sex change in a polygynous coral-reef fish, Halichoeres melanurus., Journal of Ethology, 20, (101-105), 20020401
  17. Rapid transition in sexual behaviors during protogynous sex change in the haremic angelfish Centropyge vroliki (Pomacanthidae)., Ichthyological Research, 50(1), 30-35, 20030401
  18. Sexually dichromatic protogynous angelfish Centropyge ferrugata males can change back to females., Zoological Science, 20(5), 627-633, 20030401
  19. Sleeping mound construction using coral fragments by the rockmover wrasse, Journal of Fish Biology, 63, 1352-1356, 20030401
  20. Studies on the ecology of the polygynous angelfish Centropyge ferrugatus, 19970301
  21. Foraging by mixed-species groups involving a small angelfish, Centropyge ferrugatus (Pomacanthidae), Japanese Journal of Ichthyology, 41(4), 429-435, 19950401
  22. Preliminary study on female choice of mates versus sites in a wrasse Cirrhilabrus temminckii, Ichthyological Research, 52, 406-409, 20050401
  23. Terrestrial reproduction by the air-breathing fish Andamia tetradactyla (Pisces; Blenniidae) on supralittoral reefs., Journal of Zoology (London), 269, 357-364, 20060401
  24. Cloning of full-length cDNA of teleost corticotropin-releasing hormone precursor by improved inverse PCR, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 70(8), 1983-1986, 200608
  25. Reproductive behavior of the largemouth triplefin, Ucla xenogrammus (Tripterygiidae) on reefs of Kuchierabu-jima Island, southern Japan, Ichthyological Research, 53, 415-418, 20060401
  26. Social control of terminal phase transition in primary males of the diandric wrasse, Halichoeres poecilopterus (Pisces: Labridae), Journal of Ethology, 25(1), 57-61, 20070401
  27. Feeding behavior of leaf-like juveniles of the round batfish Platax orbicularis (Ephippidae) on reefs of Kuchierabu-jima Island, southern Japan, JOURNAL OF ETHOLOGY, 26(2), 287-293, 200805
  28. Examination of the ability of gonadal sex change in primary males of the diandric wrasses Halichoeres poecilopterus and Halichoeres tenuispinis: estrogen implantation experiments, Zoological Science, 25(2), 220-224, 20080201
  29. Phylogenetic relationship of two Mola sunfishes (Tetraodontiformes: Molidae) occurring around the coast of Japan, with notes on their geographical distribution and morphological characteristics, ICHTHYOLOGICAL RESEARCH, 56(3), 232-244, 200907
  30. Diel and lunar spawning periodicity of the hawkfish Paracirrhites forsteri (Cirrhitidae) on the reefs of Kuchierabu-jima Island, southern Japan, ICHTHYOLOGICAL RESEARCH, 57(1), 102-106, 201001
  31. Ultrastructure of the surface morphology of eggs in the terrestrial spawning blenny, Andamia tetradactyla (Blenniidae)., Jpn. J. Ichthyol., 58(1), 75-79, 2011
  32. Effects of prey density on nocturnal zooplankton predation throughout the ontogeny of juvenile Platax orbicularis (Teleostei: Ephippidae), ENVIRONMENTAL BIOLOGY OF FISHES, 91(2), 177-183, 201106
  33. Harem structure and female territoriality in the dwarf hawkfish Cirrhitichthys falco (Cirrhitidae), ENVIRONMENTAL BIOLOGY OF FISHES, 92(1), 79-88, 201109
  34. Reversed Sex Change in The Haremic Protogynous Hawkfish Cirrhitichthys falco in Natural Conditions, ETHOLOGY, 118(3), 226-234, 201203
  35. Better off alone than in bad company': agonistic colour display in mimetic juveniles of two ephippid species, JOURNAL OF FISH BIOLOGY, 81(3), 1032-1042, 201208
  36. Ovarian degeneration during the female-to-male sex change in the protogynous hermaphroditic fish, Halichoeres poecilopterus, ICHTHYOLOGICAL RESEARCH, 59(3), 276-281, 201207
  37. Molecular Cloning and Expression Profile of Sex-specific Genes, Figla and Dmrt1, in the Protogynous Hermaphroditic Fish, Halichoeres poecilopterus, ZOOLOGICAL SCIENCE, 29(10), 690-701, 201210
  38. Rapid acquisition of an appetitive conditioned response in an intertidal fish, Tridentiger trigonocephalus (Gobiidae), using an ethologically relevant conditioning paradigm, BEHAVIOUR, 150(6), 585-598, 2013
  39. Trophic adaptability of late juvenile Atlantic spadefish Chaetodipterus faber (Teleostei: Ephippidae) related to habitat preferences in an estuary in northeastern Brazil, HYDROBIOLOGIA, 717(1), 161-167, 201310
  40. Fish fauna at reefs of the northern Tokara Islands, southern Japan, Journal of Graduate School ofBiosphere Science= Hiroshima University, 44, 1-14, 20051101
  41. Diets of 45 fish species from 17 families at Kuchierabu-jima Island, 47, 5-13, 2007
  42. Occurrence of the parasitic copepod Acanthochondria spirigera (Chondracanthidae) on anglerfish Lophius litulon in the East China Sea off western Japan., Journal of Graduate School ofBiosphere Science= Hiroshima University, 47, 17-22, 20081101
  43. In-situ observations of symbionts on medusae occurring in Japan, Thailand, Indonesia and Malaysia, Bulletin of the Hiroshima University Museum, 2, 9-18, 2010
  44. First record of a moilid fish, Mola sp. A from Kyushu, Japan, 62(2), 201-202, 20151105
  45. Notes on the Morphological Characteristics of Extremely Large Specimens of Mola Sun shes(Tetraodontiformes, Molidae) in Japanese Museum Collections, 18, 65-70, 20151227
  46. Morphometric comparisons of plant-mimetic juvenile fish associated with plant debris observed in the coastal subtropical waters around Kuchierabu-jima Island, southern Japan, PeerJ, 4:e2268, 20160726
  47. Polygamous mating system and protogynous sex change in the gobiid fish Fusigobius neophytus, Journal of Ethology, 34(3), 263-275, 20160526
  48. Mating system of the freckled hawkfish, Paracirrhites forsteri (Cirrhitidae) on Kuchierabu-jima Island reefs, southern Japan, Environmental Biology of Fishes, 99, 761-769, 201608
  49. Age, growth and reproduction of the Asian sheephead wrasse Semicossyphus reticulatus in the western Seto Inland Sea, Japan, Ichthyological Research, 64(4), 415-422, 201711
  50. Feeding habits of the cutlass fish Trichiurus japonicus around Hiuchi-Nada, central Seto Inland Sea, Japan, NIPPON SUISAN GAKKAISHI, 83(1), 34-40, 201701
  51. Molecular and morphological identification of Mola sunfish specimens (Actinopterygii: Tetraodontiformes: Molidae) from the Indian Ocean, Species Diversity, 22, 99-104, 20170525
  52. Winter longitudinal variation in the body size of larval fishes in the Seto Inland Sea, Japan, FISHERIES SCIENCE, 83(3), 373-382, 20170323
  53. Redescription of the bump-head sunfish Mola alexandrini (Ranzani 1839), senior synonym of Mola ramsayi (Giglioli 1883), with designation of a neotype for Mola mola (Linnaeus 1758) (Tetraodontiformes: Molidae), Ichthyological Research, 65(1), 142-160, 201801
  54. Aggressive mimicry of the cleaner wrasse by Aspidontus taeniatus functions mainly for small blennies, Ethology, 124(6), 432-439, 20180419
  55. Scaling mimesis: Morphometric and ecomorphological similarities in three sympatric plant-mimetic fish of the family Carangidae (Teleostei), PLoS ONE, 13(3), e0194437, 20180320
  56. Dual social structures in harem-like colony groups of the coral-dwelling damselfish Dascyllus reticulatus depending on body size and sheltering coral structures, Journal of Ethology, DOI:10.1007/s10164-019-00584-8(37), 175-186, 201902
  57. Estivation grounds of the sand lance Ammodytes japonicus (Ammoditidae) in the Mihara Strait, mid-western Seto Inland Sea, Japan, Bulletin of the Hiroshima University Museum, 10, 19-27, 20181225
  58. Isolation, Characterization and PCR Multiplexing of Microsatellite Loci for Western Sand Lance (Ammodytes japonicus Duncker and Mohr 1939), JARQ-JAPAN AGRICULTURAL RESEARCH QUARTERLY, 52(4), 307-313, 20181119
  59. The burrowing sand lance Ammodytes japonicus (Teleostei, Ammodytidae) prefers benthic sediments of low shear strength, Journal of Ethology, 37, 213-219, 2019

Publications such as books

  1. 1999/09, Jack Moyer's Ocean Adventures, 1999, 9
  2. 2013, Herbivory, Are Ephippid Fish a "Sleeping Functional Group"? ? Herbivory Habits by Four Ephippidae Species Based on Stomach Contents Analysis (Chapter 3), In Tech, Croatia, 2013, English, Breno Barros, Yoichi Sakai, Hiroaki Hashimoto, Kenji Gushima, Yrlan Oliveira, Fernando Ara?jo Abrunhosa, Marcelo Vallinoto, 76, 33-46
  3. 2017/09/15, Ichthyology, Kouseisha, 2017, 9, J, 978-4-7699-1610-9, 377, 15
  4. Integrated Coastal Management in the Japanese Satoumi - Restoring Estuaries and Bays, 3.3 Fish Productino and Preservation in Seto Inland Sea, Elsevier, 2019, 190820, English, Takeshi Tomiyama, Jun-ya Shibata, Yoichi Sakai, 978-0-12-813060-5, 241, 241

External Funds

Acceptance Results of Competitive Funds

  1. Inamori Foundation Grant, 2005
  2. KAKENHI, 2012, 2014
  3. KAKENHI, 2012, 2014
  4. KAKENHI, 2012, 2015
  5. KAKENHI, Social determination of sex in fishes : testing reversed sex change under low density conditions, 2009, 2011
  6. KAKENHI, 2005, 2007
  7. KAKENHI, Contribution assessment of hatchery origin black sea bream Acanthopagrus schlegeli into natural populations using microsatellite markers, 2002, 2005
  8. KAKENHI, 2000, 2001
  9. KAKENHI, 2015, 2017
  10. KAKENHI, 2016, 2018
  11. 2014
  12. 2015
  13. 2016
  14. 2017
  15. 2017
  16. 2018
  17. 2018
  18. 2017
  19. 2018
  20. 2018, 2020

Social Activities

History as Committee Members

  1. Secretary, 2015/01, 2016/12
  2. Recommendation of scientists to be nominated for The 33th Kyoto Prize, 2016/06, 2016/09, Inamori Foundation
  3. Secretary, 2016/01, 2016/12
  4. Council Members, 2017/01/01, 2018/12/31, Japan Ethological Society
  5. Secretary of Japan Ethological Society, 2017/01, 2017/12, Japan Ethological Society
  6. Secretary of Japan Ethological Society, 2018/01, 2018/12, Japan Ethological Society

Organizing Academic Conferences, etc.

  1. 2004/05
  2. 2005/05
  3. 2006/02
  4. 2013/11, 2013/12
  5. SMART Oceans and Fisheries, Pukyong National University and Hiroshima University Joint Symposium, Coordinator, 1411/05, 1411/05
  6. 1202/18, 1202/19
  7. 1802/17, 1802/18