Yoichi Sakai

Last Updated :2021/04/05

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

Educational Activity

  • 【Bachelor Degree Program】School of Applied Biological Science : Department of Applied Biological Science
  • 【Master's Program】Graduate School of Integrated Sciences for Life : Division of Integrated Sciences for Life : Program of Bioresource Science
  • 【Doctoral Program】Graduate School of Integrated Sciences for Life : Division of Integrated Sciences for Life : Program of Bioresource Science

In Charge of Primary Major Programs

  • Integrative Hydrospheric Science Program

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. 2021, Liberal Arts Education Program1, 1Term, Sport fishing and science: fishes-human beings interactions
  2. 2021, Undergraduate Education, Intensive, Laboratory Work in Hydrospheric BiologyII
  3. 2021, Undergraduate Education, 1Term, Exercises in Integrative Hydrospheric ScienceI
  4. 2021, Liberal Arts Education Program1, 1Term, Introductory Seminar for First-Year Students
  5. 2021, Undergraduate Education, Intensive, Laboratory Work in General Biology I
  6. 2021, Undergraduate Education, Intensive, Laboratory Work in General Biology II
  7. 2021, Undergraduate Education, 1Term, Reading of Foreign Literature in Integrative Hydrospheric Science
  8. 2021, Undergraduate Education, 3Term, Hydrospheric EcologyI
  9. 2021, Undergraduate Education, Intensive, (AIMS) Fish Production
  10. 2021, Undergraduate Education, 3Term, Fish Production
  11. 2021, Undergraduate Education, Intensive, Laboratory Exercise (2)
  12. 2021, Graduate Education (Master's Program) , 1Term, Exercises in Bioresource Science A
  13. 2021, Graduate Education (Master's Program) , 2Term, Exercises in Bioresource Science A
  14. 2021, Graduate Education (Master's Program) , 3Term, Exercises in Bioresource ScienceB
  15. 2021, Graduate Education (Master's Program) , 4Term, Exercises in Bioresource ScienceB
  16. 2021, Graduate Education (Master's Program) , Academic Year, Research for Academic Degree Dissertation in Bioresource Science
  17. 2021, Graduate Education (Master's Program) , 1Term, Fish Biology and Fisheries I
  18. 2021, Graduate Education (Master's Program) , 3Term, Fish Biology and Fisheries II

Research Activities

Academic Papers

  1. Feeding habits of the white-spotted boxfish Ostracion meleagris reveal a strong preference for colonial ascidians, Ichthyological Research, 68(4)
  2. Testing the effect of mimicry using a color variant of the false cleanerfish Aspidontus taeniatus found in Sesoko Island, Okinawa., Japanese Journal of Ichthyology, 67(2), 202011
  3. Non-mimic color variant of the false cleanerfish Aspidontus taeniatus found in Okinawa, Japan, Galaxea, Journal of Coral Reef Studies, 22, 1-2, 20200512
  4. The false cleanerfish relies on aggressive mimicry to bite fish fins when benthic foods are scarce in their local habitat, SCIENTIFIC REPORTS, 10(1), 20200526
  5. ★, Hermaphroditism in fishes: an annotated list of species, phylogeny, and mating system, ICHTHYOLOGICAL RESEARCH, 67(3), 341-360, 202007
  6. Burrowing ecology of western sand lance, Ammodytes japonicus, in sandy bottom, Kaiyo Monthly, 51(12), 614-618, 20191201
  7. Age and growth of the Naru eagle ray, Aetobatus narutobiei, off Sanyo-Onoda City, in the western Seto Inland Sea, Bulletin of the Hiroshima University Museum, 11, 15-24, 20191225
  8. 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
  9. The burrowing sand lance Ammodytes japonicus (Teleostei, Ammodytidae) prefers benthic sediments of low shear strength, Journal of Ethology, 37, 213-219, 2019
  10. 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
  11. Aggressive mimicry of the cleaner wrasse by Aspidontus taeniatus functions mainly for small blennies, Ethology, 124(6), 432-439, 20180419
  12. Scaling mimesis: Morphometric and ecomorphological similarities in three sympatric plant-mimetic fish of the family Carangidae (Teleostei), PLoS ONE, 13(3), e0194437, 20180320
  13. 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
  14. 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
  15. 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
  16. Feeding habits of the cutlass fish Trichiurus japonicus around Hiuchi-Nada, central Seto Inland Sea, Japan, NIPPON SUISAN GAKKAISHI, 83(1), 34-40, 201701
  17. Molecular and morphological identification of Mola sunfish specimens (Actinopterygii: Tetraodontiformes: Molidae) from the Indian Ocean, Species Diversity, 22, 99-104, 20170525
  18. Winter longitudinal variation in the body size of larval fishes in the Seto Inland Sea, Japan, FISHERIES SCIENCE, 83(3), 373-382, 20170323
  19. Emergence behavior of a tide pool fish Praealticus tanegasimae (Teleostei; Blenniidae) on subtropical reefs, Journal of Ethology, 34(2), 175-181, 20160305
  20. 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
  21. ★, Polygamous mating system and protogynous sex change in the gobiid fish Fusigobius neophytus, Journal of Ethology, 34(3), 263-275, 20160526
  22. Mating system of the freckled hawkfish, Paracirrhites forsteri (Cirrhitidae) on Kuchierabu-jima Island reefs, southern Japan, Environmental Biology of Fishes, 99, 761-769, 201608
  23. Comparative allometric growth of the mimetic ephippid reef fishes Chaetodipterus faber and Platax orbicularis, PLOS ONE, 10(12), 20151202
  24. First record of a moilid fish, Mola sp. A from Kyushu, Japan, 62(2), 201-202, 20151105
  25. Notes on the Morphological Characteristics of Extremely Large Specimens of Mola Sun shes(Tetraodontiformes, Molidae) in Japanese Museum Collections, 18, 65-70, 20151227
  26. 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
  27. 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
  28. Reversed sex change in the haremic protogynous hawkfish Cirrhitichthys falco in natural conditions, ETHOLOGY, 118(3), 226-234, 201203
  29. 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
  30. Ovarian degeneration during the female-to-male sex change in the protogynous hermaphroditic fish, Halichoeres poecilopterus, ICHTHYOLOGICAL RESEARCH, 59(3), 276-281, 201207
  31. 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
  32. Ultrastructure of the surface morphology of eggs in the terrestrial spawning blenny, Andamia tetradactyla (Blenniidae)., Jpn. J. Ichthyol., 58(1), 75-79, 2011
  33. 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
  34. Harem structure and female territoriality in the dwarf hawkfish Cirrhitichthys falco (Cirrhitidae), ENVIRONMENTAL BIOLOGY OF FISHES, 92(1), 79-88, 201109
  35. 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
  36. In-situ observations of symbionts on medusae occurring in Japan, Thailand, Indonesia and Malaysia, Bulletin of the Hiroshima University Museum, 2, 9-18, 2010
  37. 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
  38. 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
  39. 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
  40. 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
  41. 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
  42. Diets of 45 fish species from 17 families at Kuchierabu-jima Island, 47, 5-13, 2007
  43. Terrestrial reproduction by the air-breathing fish Andamia tetradactyla (Pisces; Blenniidae) on supralittoral reefs., Journal of Zoology (London), 269, 357-364, 20060401
  44. Cloning of full-length cDNA of teleost corticotropin-releasing hormone precursor by improved inverse PCR, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 70(8), 1983-1986, 200608
  45. Reproductive behavior of the largemouth triplefin, Ucla xenogrammus (Tripterygiidae) on reefs of Kuchierabu-jima Island, southern Japan, Ichthyological Research, 53, 415-418, 20060401
  46. 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
  47. Foraging behavior and diet composition of Trimma caudomaculata and T. caesiura (Gobiidae) on coral reefs in Okinawa, Japan, Ichthyological Research, 52, 302-305, 20050401
  48. 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
  49. Preliminary study on female choice of mates versus sites in a wrasse Cirrhilabrus temminckii, Ichthyological Research, 52, 406-409, 20050401
  50. Fish fauna at reefs of the northern Tokara Islands, southern Japan, Journal of Graduate School ofBiosphere Science= Hiroshima University, 44, 1-14, 20051101
  51. Rapid transition in sexual behaviors during protogynous sex change in the haremic angelfish Centropyge vroliki (Pomacanthidae)., Ichthyological Research, 50(1), 30-35, 20030401
  52. ★, Sexually dichromatic protogynous angelfish Centropyge ferrugata males can change back to females., Zoological Science, 20(5), 627-633, 20030401
  53. Sleeping mound construction using coral fragments by the rockmover wrasse, Journal of Fish Biology, 63, 1352-1356, 20030401
  54. Modeling spawning strategy for sex change under social control in haremic angelfishes., Behavioral Ecology, 13(1), 75-82, 20020401
  55. ★, Reversed sex-change in the protogynous reef fish, Labroides dimidiatus., Ethology, 108, (443-450), 20020401
  56. Status-dependent behavioural sex change in a polygynous coral-reef fish, Halichoeres melanurus., Journal of Ethology, 20, (101-105), 20020401
  57. Spawning timing of the cleaner wrasse, Labroides dimidiatus in a warm temperate rocky shore., Ichthyological Research, 48, 23-30, 20010401
  58. ★, Effect of changing harem on timing of sex change in female cleaner fish Labroides dimidiatus., Animal Behaviour, 62, 251-257, 20010401
  59. ★, Female-female spawning and sex change in a haremic coral-reef fish, Labroides dimidiatus., Zoological Science, 17, 967-970, 20000401
  60. Predation risk affects female choice opportunity in a coral reef fish., Journal of Ethology, 18, 109-114, 20000401
  61. ★, Harem structure of the protogynous angelfish, Centropyge ferrugatus (Pomacanthidae)., Environmental Biology of Fishes, 49, 333-339, 19970401
  62. ★, Alternative spawning tactics of female angelfish according to two different contexts of sex change., Behavioral Ecology, 8(4), 372-377, 19970401
  63. Studies on the ecology of the polygynous angelfish Centropyge ferrugatus, 19970301
  64. Fecundity of female angelfish, Centropyge ferrugatus, independent of body size: field collection of spawned eggs., Ichthyological Research, 43(2), 186-189, 19960401
  65. Anti-egg predator behaviors of the small angelfish Centropyge ferrugatus (Pomacanthidae)., Environmental Biology of Fishes, 43, 401-405, 19950401
  66. Foraging by mixed-species groups involving a small angelfish, Centropyge ferrugatus (Pomacanthidae), Japanese Journal of Ichthyology, 41(4), 429-435, 19950401

Publications such as books

  1. 2019/08/20, Integrated Coastal Management in the Japanese Satoumi - Restoring Estuaries and Bays, 3.3 Fish Productino and Preservation in Seto Inland Sea, Elsevier, 2019, 190820, Scholarly Book, Joint work, E, Takeshi Tomiyama, Jun-ya Shibata, Yoichi Sakai, 978-0-12-813060-5, 241, 241
  2. 2017/09/15, Ichthyology, Kouseisha, 2017, 9, Textbook, Joint work, J, 978-4-7699-1610-9, 377, 15
  3. 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, Scholarly Book, Joint work, English, Breno Barros, Yoichi Sakai, Hiroaki Hashimoto, Kenji Gushima, Yrlan Oliveira, Fernando Ara?jo Abrunhosa, Marcelo Vallinoto, 76, 33-46
  4. 1999/09, Jack Moyer's Ocean Adventures, 1999, 9, Joint Translation

Invited Lecture, Oral Presentation, Poster Presentation

  1. Function of mimicry in the false cleanerfish Aspidontus taeniatus (Blenniidae) examined by its breeding and feeding behaviors, Hajime SATO, Yoichi SAKAI, Tetsuo KUWAMURA, The 67th Annual Meeting of the Ecological Society of Japan, 2020/03/07, Without Invitation, English, Ecological Society of Japan
  2. Publication of the database of hermaphroditic fish species with verification of the size-advantage model, Tetsuo KUWAMURA, Tomoki SUNOBE, Yoichi SAKAI, Tatsuru KADOTA and Kota SAWADA, 2019th Annual Meeting of the Ichthyological Society of Japan, 2019/09/21, Without Invitation, Japanese, The Ichthyological Society of Japan, Kochi University
  3. Reproductive ecology of the false cleanerfish Aspidontus taeniatus (Blenniidae), Hajime SATO, Yoichi SAKAI, Tetsuo KUWAMURA, 2019th Annual Meeting of the Ichthyological Society of Japan, 2019/09/21, Without Invitation, Japanese, The Ichthyological Society of Japan, Kochi University
  4. Cryptical sex change as a mating tactic in a coral dwelling polygynous damselfish Dascyllus reticulatus, Rei Sakanoue, Yoichi Sakai, The 10th Indo-Pacific Fish Conference, 2017/10/04, Without Invitation, English, David Leccini, Tahiti, French Polynesia
  5. Sex change, mating system, and effect of population density in reef fish, Tetsuo Kuwamura, Tomoki Sunobe, Yoichi Sakai, Tetsuo Kuwamura, Tomoki Sunobe, The 10th Indo-Pacific Fish Conference, 2017/10/04, Without Invitation, English, David Leccini, Tahiti, French Polynesia
  6. Strict pair-bond and stable territories of the vagabond butterflyfish, Chaetodon vagabundus performing spawning migration, Azusa Endo, Yoichi Sakai, The 10th Indo-Pacific Fish Conference, 2017/10/04, Without Invitation, English, David Leccini, Tahiti, French Polynesia
  7. The cleaner's mimic Aspidontus taeniatus utilizes the effect of aggressive mimicry only when it is smal, Misaki Fujisawa, Yoichi Sakai, Tetsuo Kuwamura, Tetsuo Kuwamura, The 10th Indo-Pacific Fish Conference, 2017/10/03, Without Invitation, English, Chairman Dr. David Lecchini and the Organizing Committee, Tahiti, French Polynesia
  8. Effects of population density on the sexual patterns and mating systems in fish, 2017/09/17, Without Invitation, Japanese
  9. Benefits of resemblance in the cleaner's mimic Aspidontus taeniatus: various ways of feeding and population dynamics on the coral reef of Sesoko Island, Okinawa, Fujisawa M, Y. Sakai, T. Kuwamura, The 22nd International Congress of Zoology, 2016/11/14, Without Invitation, Japanese, OIST and The Zoological Society of Japan, Okinawa Convention Center
  10. Mystery of the cleaner's mimic: seasonal population dynamics of the blenny Aspidontus taeniatus, Kuwamura T, Fujisawa M, Sakai Y., 2016/09/23, Without Invitation, Japanese, The Ichthyological Society of Japan
  11. Preserence for a sandy bottom substrate by the sand lance Ammodytes japonicus in the mid-western Seto Inkand Sea, witho notes on the behaviors under the sand, 2016/09/23, Without Invitation, Japanese
  12.  Mystery of the cleaner's mimic: various ways of feeding and the possibility of aggressive mimicry in the blenny Aspidontus taeniatus on the coral reef of Sesoko Island, Okinawa, Fujisawa M, Sakai Y, Kuwamura T., 2016/09/23, Without Invitation, Japanese
  13. Association of mimic juvenile fish with mangrove plants: insight into the use of mangrove habitats as nurseries fro juvenile fish, 2014, Without Invitation

Awards

  1. 2019/09/22, The best poster presentation award, The Ichthyological Society of Japan, Reproductive ecology of the false cleanerfish Aspidontus taeniatus (Blenniidae)
  2. 2019/11/23, The best poster presentation award, Japan Ethological Society, 掃除魚に擬態するニセクロスジギンポの卵食と群れ行動

External Funds

Acceptance Results of Competitive Funds

  1. 2021, 2021
  2. 2019
  3. 2019
  4. 2019, 2019
  5. 2018
  6. 2018
  7. 2018
  8. 2018, 2020
  9. 2017
  10. 2017
  11. 2017
  12. KAKENHI, 2016, 2018
  13. 2016
  14. KAKENHI, 2015, 2017
  15. 2015
  16. 2014
  17. KAKENHI, 2012, 2014
  18. KAKENHI, 2012, 2014
  19. KAKENHI, 2012, 2015
  20. KAKENHI, Social determination of sex in fishes : testing reversed sex change under low density conditions, 2009, 2011
  21. Inamori Foundation Grant, 2005
  22. KAKENHI, 2005, 2007
  23. KAKENHI, Contribution assessment of hatchery origin black sea bream Acanthopagrus schlegeli into natural populations using microsatellite markers, 2002, 2005
  24. KAKENHI, 2000, 2001

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