Lei, S., Zhang, X., Zhang, P. and Ikeda, Y. 2013. Biochemical composition of cuttlefish (Sepia esculenta) eggs during embryonic development. Molluscan Research, 34, 1–9. DOI: 10.1080/13235818.2013.826576
Kobayashi, S., Takayama, C. and Ikeda, Y. 2013. Distribution of glutamic acid decarboxylase immunoreactivity within the brain of oval squid Sepioteuthis lessoniana. Aquatic Biology, 19: 97-109
Sugimoto, C. and Ikeda, Y. 2013. Comparison of the ontogeny of hunting behavior in pharaoh cuttlefish (Sepia pharaonis) and oval squid (Sepioteuthis lessoniana). Biological Bulletin, 225, 50-59.
Sugimoto, C., Yanagisawa, R., Nakajima, R. and Ikeda, Y. 2013. Observations of schooling behaviour in the oval squid Sepioteuthis lessoniana in coastal waters of Okinawa Island. Marine Biodiversity Records, 6, e34.
Kobayashi, S., Takayama, C. and Ikeda, Y. 2013. Ontogeny of the brain in oval squid Sepioteuthis lessoniana (Cephalopoda: Loliginidae) during the post-hatching phase. Journal of the Marine Biological Association of the UK, 93 (6): 1663-1671
Sugimoto, C. and Y. Ikeda, 2012. Ontogeny of schooling behavior in the oval squid Sepioteuthis lessoniana. Fisheries Sciense, 78: 287-294
Yasumuro, H. and Y. Ikeda, 2011. Effects of environmental enrichment on the behavior of the tropical octopus Callistoctopus aspilosimatis. Marine and Freshwater Behaviour and Physiology, 44: 143-157.
Itoi, S., J. Odaka, K. Yuasa, S. Akeno, A. Nakajima, A. Suenaga, T. Noda, S. Akimoto, T. Myojin, Y. Ikeda, Y. Masuda, N. Takai, K. Yoshihara and H. Sugita, 2010. Distribution and species composition of juvenile and adult scombropids (Teleostei, Scombropidae) in Japanese coastal waters. Journal of Fish Biology, 76: 369-378.
Sato, N., T. Kasugai, Y. Ikeda and H. Munehara. Structure of the seminal receptacle and sperm storage in the Japanese pygmy squid. Journal of Zoology, 282: 151-156, 2010.
Ikeda, Y. and M. Kobayashi, 2010. Statolith growth of juvenile oval squid Sepioteuthis lessoniana(Cephalopoda: Loliginidae) with special reference to ambient thermal condition. Marine Biology Research, 6: 485-495.
Y. Ikeda, H. Imai, C. Sugimoto and Y. Oshima, Egg case containing three ova of oval squid Sepioteuthis lessoniana in Okinawa Island of the Ryukyu Archipelago. Aquaculture Science, 57(4), 631-634, 2009
Y. Ikeda, C. Sugimoto, H. Yonamine and Y. Oshima, Method of ethanol anesthesia and individual marking for oval squid (Sepioteuthis lessonianaFérussac, 1831 in Lesson 1830-1831). Aquaculture Research, 41, 157-160, 2009
Y. Ikeda, Y. Oshima, C. Sugimoto and H. Imai, Multiple Spawning by Uncopulated oval squid (Sepioteuthis lessoniana) in captivity. Aquaculture Science, 57, 39-43, 2009
Y. Ikeda, Y. Ueta, F.E. Anderson and G. Matsumoto, Reproduction and life span of the oval squidSepioteuthis lessoniana (Cephalopoda: Loliginidae): comparison between laboratory-cultured and wild caught squid. JMBA2 Biodiversity Records, published on-line, Reference No. 5994., 2008.
M. Aoki, H. Imai, T. Naruse, Y. Ikeda. Low genetic diversity of oval squid Sepioteuthis cf. lessoniana(Cephalopoda: Loliginidae) in Japanese waters inferred from a mitochondrial DNA non-coding region. Pacific Science, 62, 403-411, 2008
Y. Ikeda, G. Matsumoto. Mirror image reactions in oval squid Sepioteuthis lessoniana. Fisheries Science, 73, 1401-1403, 2007
N. Kaneko, Y. Oshima, Y. Ikeda. Egg brooding behavior and embryonic development of Octopus laqueus (Cephalopoda: Octopodidae). Molluscan Research, 26, 113-117, 2006
Y. Ikeda, I. Sakurazawa, K. Ito, Y. Sakurai, G. Matsumoto. Rearing of squid hatchlings, Heterololigo bleekeri (Keferstein 1866) up to 2 months in a closed seawater system. Aquaculture Research, 36, 409-412, 2005.
Y. Ikeda. A perspective on the study of cognition and sociality of cephalopod mollusks, a group of intelligent marine invertebrates. Japanese Psychological Research, 51, 146-153, 2009.
池田 譲. 2010. Sociality in cephalopods: endeavoring to look through mirror image reactions. Research Centre for Human Cognition The 5th Symposium, “Let’s Talk About Infrahuman Intelligence - ヒト以外の知性について話そう!-”, 東京.
Y. Ikeda, 2008. Reactions to mirror reflection in squid. The International Symposium on Comparative Cognitive Science, Primate origins of human mind, 京都.
Y. Ikeda, 2008. Squids in tropical waters. United Nations University, International Training on POPs Analysis in Squid, 神奈川.
Shuhan Lei・Chikatoshi Sugimoto・Xiumei Zhang・Yuzuru Ikeda, 2012. Ontogeny of vision of oval squid with special reference to retinal morphology, 日本動物行動学会第31回大会, 奈良.
Amy Arnett・Yuzuru Ikeda, 2010. Personality in the shallow-water octopus,Abdopus aculeatus: possibility of an optimal “rearing personality”. 日本水産学会春季大会, 神奈川.
Nakajima, R. and Y. Ikeda, 2012. The origin of visual communication: Sepia pharaonis body patterns and cotemporary art. Cephalopod International Advisory Council Symposium 2012, Santa Catarina, Brazil.
Arnett, A. and Y. Ikeda, 2011. Letting go: autotomy and personality in the octopus Abdopus aculeatusfrom Okinawa, Japan. Behavior 2011, Bloomington.
Okamoto, K., A. Mori and Y. Ikeda, 2011. Consistent individual differences in camouflage patterns in cuttlefish. Behavior 2011, Bloomington.
Kobayashi, K., C. Takayama and Y. Ikeda, 2011. Distribution of glutamic acid decarboxylase (GAD) immunoreactivity in oval squid. Behavior 2011, Bloomington.
Y. Ikeda. Sociality and mirror image reactions in cephalopods. XXXI International Ethological Conference, August 2009, Rennes University, France.
A. Arnett, Y. Ikeda. Personality in the shallow-water octopus (Abdopus aculeatus) local to Okinawa, Japan. XXXI International Ethological Conference,August 2009, Rennes University, France.
S. Kobayashi, Y. Ikeda. Ontogeny of brain under various visual environmentsduring post-hatching phase in oval squid. XXXI International Ethological Conference, August 2009, Rennes University, France.
C. Sugimoto, Y. Ikeda. Ontogeny of schooling behavior and individual interactions in oval squid. XXXI International Ethological Conference, August 2009, Rennes University, France.
Y. Ikeda. Looking at yourself: reactions to mirror reflection in oval squid. XXXth International.Ethological Conference, August 2007, Dalhousie University, Canada.
Y. Oshima, Y. Ikeda. Ontogenetic change of relative growth and locomotion in juvenile oval squid.XXXth International Ethological Conference, August 2007, Dalhousie University, Canada.
S. Kobayashi, Y. Ikeda. Development of the brain during post-hatching in the oval squid. XXXth International Ethological Conference, August 2007, Dalhousie University, Canada.
C. Sugimoto, Y. Ikeda. The juvenile oval squid is a technical hunter: ontogenetic changes of feeding behavior. XXXth International Ethological Conference, August 2007, Dalhousie University, Canada.
Y. Ikeda, T. Konishi, H. Imai. Fisheries of Sepioteuthis lessoniana species group around Okinawa Island, Japan. 21st Pacific Science Congress, June 2007, Okinawa Convention Center, Japan.
Y. Abe, Y. Ikeda. Preliminary report on growth and reproduction of Sepioteuthis sp. 3 (Cephalopoda: Loliginidae) around Okinawa Island, Japan. 21st Pacific Science Congress, June 2007, Okinawa Convention Center, Japan.
M. Aoki, H. Imai, T. Naruse, Y. Ikeda. Genetic population structure of oval squid Sepioteuthislessoniana species group around Ryukyuan waters, Japan. 21st Pacific Science Congress, June 2007, Okinawa Convention Center, Japan.
M. Aoki, H. Imai, T. Naruse, Y, Ikeda. Low genetic diversity of oval squid Sepioteuthis lessoniana 2 in Japan inferred from non-coding region of mitochondrial DNA. Workshop on Tropical Island Ecosystems and Sustainable Development. December 2006, Moorea, Tahiti.
R. Yanagisawa, N. Kaneko, Y. Ikeda. Preliminary trial for measurement of activity rhythm in tropical octopuses with special reference to its relation to the environmental variables. Cephalopod International Advisory Council Symposium 2006, February 2006, Hobart, Tasmania, Australia.
N. Kaneko, Y. Ikeda. Spatial distribution pattern of sympatric tropical octopuses in the coastal waters of the Ryukyu Islands. Cephalopod International Advisory Council Symposium, 2006, February 2006, Hobart, Tasmania, Australia.
Y. Ikeda, C. Namba. Mirror image reactions in squid: behavioral divergence in cephalopod social systems. The 21st century COE program, University of the Ryukyus The 1st International Symposium, March 2005, University of the Ryukyus, Japan.