 It may be found alone or in proximity to others of its species.Parasites documented from this species include the tapeworms "Phyliobothrium marginatum" and "Tylocephalum squatinae", the copepods "Eudactylina squatini" and "Trebius shiinoi", and the praniza larvae of the isopod "Gnathia trimaculata".The Japanese angelshark is viviparous, and as in other members of its family the developing embryos are nourished by yolk.