?Yuji Ishikawa was an Associate Professor at the Department of Anatomy, Faculty of Medicine, University of the Ryukyus, Okinawa, Japan (1985-1992) and a Researcher at National Institute of Radiological Sciences, Chiba, Japan (1992-2016). His research interests include developmental biology and developmental neurobiology, especially the developmental neurotoxic effects of radiation. Naoyuki Yamamoto is a Professor at the Graduate School of Bioagricultural Sciences, Nagoya University, Japan since 2007. His research interests include sensory, motor, and nervous system, behavior, and their evolution of fishes. He is on the editorial board of Brain, Behavior and Evolution since 2004 and The Journal of Comparative Neurology since 2010. Hanako Hagio is a Designated Assistant Professor at Young Leaders Cultivation Program (YLC), Institute for Advanced Research and Graduate School of Bioagricultural Sciences, Nagoya University, Japan since 2020. Her research interests include the evolution and functions of central visual system in fishes, and fisheries science from the points of view of sensory and nervous systems.