Yoichi Sakai

Last Updated :2020/07/03

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. 2020, Liberal Arts Education Program1, 1Term, Life, food, and environmental sciences
  2. 2020, Liberal Arts Education Program1, 3Term, Sport fishing and science: fishes-human beings interactions
  3. 2020, Undergraduate Education, 1Term, Introduction to Applied Biological Sciences
  4. 2020, Undergraduate Education, Intensive, Laboratory Work in General Biology I
  5. 2020, Undergraduate Education, Intensive, Laboratory Work in General Biology II
  6. 2020, Undergraduate Education, 1Term, Reading of Foreign Literature
  7. 2020, Undergraduate Education, 1Term, Statistics in Biology
  8. 2020, Undergraduate Education, Intensive, Laboratory Work in Hydrospheric BiologyII
  9. 2020, Undergraduate Education, Intensive, Field Works and Experiments of Marine Fisheries Science in "Sato Umi"the Seto Inland Sea
  10. 2020, Undergraduate Education, Academic Year, Graduation Thesis
  11. 2020, Undergraduate Education, 1Term, Behavioral Ecology of Fish
  12. 2020, Undergraduate Education, 3Term, Hydrospheric EcologyI
  13. 2020, Undergraduate Education, Intensive, (AIMS) Fish Production
  14. 2020, Undergraduate Education, 3Term, Fish Production
  15. 2020, Undergraduate Education, Intensive, Laboratory Exercise (2)
  16. 2020, Graduate Education (Doctoral Program) , First Semester, Exercises in Aquatic Biology(B)
  17. 2020, Graduate Education (Doctoral Program) , Second Semester, Exercises in Aquatic Biology(B)
  18. 2020, Graduate Education (Master's Program) , 3Term, Fish Sociobiology: introduction
  19. 2020, Graduate Education (Master's Program) , 3Term, Fish Sociobiology: advance
  20. 2020, Graduate Education (Master's Program) , 1Term, Exercises in Bioresource Science A
  21. 2020, Graduate Education (Master's Program) , 2Term, Exercises in Bioresource Science A
  22. 2020, Graduate Education (Master's Program) , 3Term, Exercises in Bioresource ScienceB
  23. 2020, Graduate Education (Master's Program) , 4Term, Exercises in Bioresource ScienceB
  24. 2020, Graduate Education (Master's Program) , Academic Year, Research for Academic Degree Dissertation in Bioresource Science
  25. 2020, Graduate Education (Master's Program) , Academic Year, Research for Academic Degree Dissertation in Bioresource Science
  26. 2020, Graduate Education (Master's Program) , 1Term, Fish Biology and Fisheries I
  27. 2020, Graduate Education (Master's Program) , 3Term, Fish Biology and Fisheries II

Research Activities

Academic Papers

  1. 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
  2. Non-mimic color variant of the false cleanerfish Aspidontus taeniatus found in Okinawa, Japan, Galaxea, Journal of Coral Reef Studies, 22, 1-2, 20200512
  3. Hermaphroditism in fishes: an annotated list of species, phylogeny, and mating system, Ichthyological Research, 20200507
  4. The false cleanerfish relies on aggressive mimicry to bite fish fins when benthic foods are scarce in their local habitat, Scientific Reports, 10, 20200526
  5. Burrowing ecology of western sand lance, Ammodytes japonicus, in sandy bottom, Kaiyo Monthly, 51(12), 614-618, 20191201
  6. 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
  7. 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
  8. The burrowing sand lance Ammodytes japonicus (Teleostei, Ammodytidae) prefers benthic sediments of low shear strength, Journal of Ethology, 37, 213-219, 2019
  9. 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
  10. Aggressive mimicry of the cleaner wrasse by Aspidontus taeniatus functions mainly for small blennies, Ethology, 124(6), 432-439, 20180419
  11. Scaling mimesis: Morphometric and ecomorphological similarities in three sympatric plant-mimetic fish of the family Carangidae (Teleostei), PLoS ONE, 13(3), e0194437, 20180320
  12. 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
  13. 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
  14. 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
  15. Feeding habits of the cutlass fish Trichiurus japonicus around Hiuchi-Nada, central Seto Inland Sea, Japan, NIPPON SUISAN GAKKAISHI, 83(1), 34-40, 201701
  16. Molecular and morphological identification of Mola sunfish specimens (Actinopterygii: Tetraodontiformes: Molidae) from the Indian Ocean, Species Diversity, 22, 99-104, 20170525
  17. Winter longitudinal variation in the body size of larval fishes in the Seto Inland Sea, Japan, FISHERIES SCIENCE, 83(3), 373-382, 20170323
  18. Emergence behavior of a tide pool fish Praealticus tanegasimae (Teleostei; Blenniidae) on subtropical reefs, Journal of Ethology, 34(2), 175-181, 20160305
  19. 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
  20. Polygamous mating system and protogynous sex change in the gobiid fish Fusigobius neophytus, Journal of Ethology, 34(3), 263-275, 20160526
  21. Mating system of the freckled hawkfish, Paracirrhites forsteri (Cirrhitidae) on Kuchierabu-jima Island reefs, southern Japan, Environmental Biology of Fishes, 99, 761-769, 201608
  22. Comparative allometric growth of the mimetic ephippid reef fishes Chaetodipterus faber and Platax orbicularis, PLOS ONE, 10(12), 20151202
  23. First record of a moilid fish, Mola sp. A from Kyushu, Japan, 62(2), 201-202, 20151105
  24. Notes on the Morphological Characteristics of Extremely Large Specimens of Mola Sun shes(Tetraodontiformes, Molidae) in Japanese Museum Collections, 18, 65-70, 20151227
  25. 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
  26. 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
  27. Reversed sex change in the haremic protogynous hawkfish Cirrhitichthys falco in natural conditions, ETHOLOGY, 118(3), 226-234, 201203
  28. 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
  29. Ovarian degeneration during the female-to-male sex change in the protogynous hermaphroditic fish, Halichoeres poecilopterus, ICHTHYOLOGICAL RESEARCH, 59(3), 276-281, 201207
  30. 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
  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. 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
  35. In-situ observations of symbionts on medusae occurring in Japan, Thailand, Indonesia and Malaysia, Bulletin of the Hiroshima University Museum, 2, 9-18, 2010
  36. 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
  37. 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
  38. 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
  39. 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
  40. 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
  41. Diets of 45 fish species from 17 families at Kuchierabu-jima Island, 47, 5-13, 2007
  42. Terrestrial reproduction by the air-breathing fish Andamia tetradactyla (Pisces; Blenniidae) on supralittoral reefs., Journal of Zoology (London), 269, 357-364, 20060401
  43. Cloning of full-length cDNA of teleost corticotropin-releasing hormone precursor by improved inverse PCR, BIOSCIENCE BIOTECHNOLOGY AND BIOCHEMISTRY, 70(8), 1983-1986, 200608
  44. Reproductive behavior of the largemouth triplefin, Ucla xenogrammus (Tripterygiidae) on reefs of Kuchierabu-jima Island, southern Japan, Ichthyological Research, 53, 415-418, 20060401
  45. 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
  46. Foraging behavior and diet composition of Trimma caudomaculata and T. caesiura (Gobiidae) on coral reefs in Okinawa, Japan, Ichthyological Research, 52, 302-305, 20050401
  47. 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
  48. Preliminary study on female choice of mates versus sites in a wrasse Cirrhilabrus temminckii, Ichthyological Research, 52, 406-409, 20050401
  49. Fish fauna at reefs of the northern Tokara Islands, southern Japan, Journal of Graduate School ofBiosphere Science= Hiroshima University, 44, 1-14, 20051101
  50. Rapid transition in sexual behaviors during protogynous sex change in the haremic angelfish Centropyge vroliki (Pomacanthidae)., Ichthyological Research, 50(1), 30-35, 20030401
  51. Sexually dichromatic protogynous angelfish Centropyge ferrugata males can change back to females., Zoological Science, 20(5), 627-633, 20030401
  52. Sleeping mound construction using coral fragments by the rockmover wrasse, Journal of Fish Biology, 63, 1352-1356, 20030401
  53. Modeling spawning strategy for sex change under social control in haremic angelfishes., Behavioral Ecology, 13(1), 75-82, 20020401
  54. Reversed sex-change in the protogynous reef fish, Labroides dimidiatus., Ethology, 108, (443-450), 20020401
  55. Status-dependent behavioural sex change in a polygynous coral-reef fish, Halichoeres melanurus., Journal of Ethology, 20, (101-105), 20020401
  56. Spawning timing of the cleaner wrasse, Labroides dimidiatus in a warm temperate rocky shore., Ichthyological Research, 48, 23-30, 20010401
  57. Effect of changing harem on timing of sex change in female cleaner fish Labroides dimidiatus., Animal Behaviour, 62, 251-257, 20010401
  58. Female-female spawning and sex change in a haremic coral-reef fish, Labroides dimidiatus., Zoological Science, 17, 967-970, 20000401
  59. Predation risk affects female choice opportunity in a coral reef fish., Journal of Ethology, 18, 109-114, 20000401
  60. Harem structure of the protogynous angelfish, Centropyge ferrugatus (Pomacanthidae)., Environmental Biology of Fishes, 49, 333-339, 19970401
  61. Alternative spawning tactics of female angelfish according to two different contexts of sex change., Behavioral Ecology, 8(4), 372-377, 19970401
  62. Studies on the ecology of the polygynous angelfish Centropyge ferrugatus, 19970301
  63. Fecundity of female angelfish, Centropyge ferrugatus, independent of body size: field collection of spawned eggs., Ichthyological Research, 43(2), 186-189, 19960401
  64. Anti-egg predator behaviors of the small angelfish Centropyge ferrugatus (Pomacanthidae)., Environmental Biology of Fishes, 43, 401-405, 19950401
  65. 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. 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
  2. 2017/09/15, Ichthyology, Kouseisha, 2017, 9, 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, 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

Invited Lecture, Oral Presentation, Poster Presentation

  1. 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, The Ichthyological Society of Japan
  2. 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
  3.  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
  4. 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, OIST and The Zoological Society of Japan, Okinawa Convention Center
  5. Association of mimic juvenile fish with mangrove plants: insight into the use of mangrove habitats as nurseries fro juvenile fish, 2014, Without Invitation
  6. 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, Chairman Dr. David Lecchini and the Organizing Committee, Tahiti, French Polynesia
  7. 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, David Leccini, Tahiti, French Polynesia
  8. 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, David Leccini, Tahiti, French Polynesia
  9. 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, David Leccini, Tahiti, French Polynesia
  10. Effects of population density on the sexual patterns and mating systems in fish, 2017/09/17, Without Invitation
  11. 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, The Ichthyological Society of Japan, Kochi University
  12. 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, The Ichthyological Society of Japan, Kochi University
  13. 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, Ecological Society of Japan

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