2013

• Hibino, Y., Kai, Y. & Kimura, S. 2013. Scolecenchelys fuscogularis (Anguilliformes: Ophichthidae, Myrophinae), a new worm eel from Japan. Ichthyological Research 60(1): 43–47.Reference page. 

2015

• Orr, J.W., Kai, Y. & Nakabo, T., 2015: Snailfishes of the Careproctus rastrinus complex (Liparidae): redescriptions of seven species in the North Pacific Ocean region, with the description of a new species from the Beaufort Sea. Zootaxa 4018(3): 301–348. DOI: 10.11646/zootaxa.4018.3.1 . Preview (PDF) Full article (PDF) Reference page. 
• Kai, Y., Ikeguchi, S., Kim, J.-K. & Nakabo, T. 2015. First Japanese record and a revised diagnosis for Dictyosoma tongyeongensis (Osteichthyes: Perciformes: Stichaeidae). Species Diversity 20(2): 107–114. DOI: 10.12782/sd.20.2.107 Reference page. 

2016

• Lee, M.-Y., Munroe, T.A. & Kai, Y. 2016. Description of a new cryptic species of tonguefish (Pleuronectiformes: Cynoglossidae: Symphurus) from shallow waters off Japan. Ichthyological Research, First online: 11 July 2016. DOI: 10.1007/s10228-016-0541-8 Reference page. 

2017

• Han, S-Y., Kim, J-K., Kai, Y. & Senou, H. 2017. Seahorses of the Hippocampus coronatus complex: taxonomic revision, and description of Hippocampus haema, a new species from Korea and Japan (Teleostei, Syngnathidae). ZooKeys 712: 113–139. DOI: 10.3897/zookeys.712.14955 . Reference page. 

• Lee, S.J., Kim, J-K., Kai, Y., Ikeguchi, S-i. & Nakabo, T. 2017. Taxonomic review of dwarf species of Eumicrotremus (Actinopterygii: Cottoidei: Cyclopteridae) with descriptions of two new species from the western North Pacific. Zootaxa 4282(2): 337–349. DOI: 10.11646/zootaxa.4282.2.7 . Reference page. 

• Stevenson, D.E., Mecklenburg, C.W. & Kai, Y. 2017. Taxonomic clarification of the Eumicrotremus asperrimus species complex (Teleostei: Cyclopteridae) in the eastern North Pacific. Zootaxa 4294(4): 419–435. DOI: 10.11646/zootaxa.4294.4.2 . Full article (PDF) Reference page. 

2018

• Han, S-Y., Kim, J-K., Kai, Y. & Senou, H. 2018. Corrigenda: Han S-Y, Kim J-K, Kai Y, Senou H (2017) Seahorses of the Hippocampus coronatus complex: taxonomic revision, and description of Hippocampus haema, a new species from Korea and Japan (Teleostei, Syngnathidae). ZooKeys 712: 113–139. https://doi.org/10.3897/zookeys.712.14955. ZooKeys 753: 169-170. DOI: 10.3897/zookeys.753.25599 . Reference page. 

• Kai, Y. & Fricke, R. 2018. Taxonomic review of the deep water flathead genus Parabembras with description of the new species Parabembras multisquamata from the western Pacific Ocean (Teleostei, Parabembridae). ZooKeys 740: 59–76. DOI: 10.3897/zookeys.740.21729 . Reference page.