Six-gill stingray collected from the Ensyu-nada, Japan. Kaiyo Gougai, 45, 23–31
First record of the porcupine ray, Urogymnus asperrimus (Bloch et Schneider, 1801) from Japan. I.O.P. Diving News, 15(8), 2–7
Reproductive Strategy of the Japanese Common Skate (Spiny Rasp Skate) Okamejei kenojei. In Elasmobranch Biodiversity, Conservation and Management. Proceedings of the conference on Shark and Ray Biodiversity, Conservation and Management, Sabah, Malaysia, July 1997. IUCN, Gland, Switzerland: 236–240
The occurrence of albinism in individuals of the manta ray and Japanese common skate found in the western Pacific. IOP Diving News, 12(7), 6–20
Biology of the manta ray, Manta birostris Walbaum in the Indo-Pacific. In Seret, B. and Sire, J.Y. (Eds) Indo-Pacific fish biology: Proceedings of the 5th Indo-Pacific Fisheries Conference, Noumea, 1997. Ichthyological Society of France, Paris: 209–216
Record of a white-spotted guitarfish from the main island of the Ryukyu Archipelago. Report of Japanese Society for Elasmobranch Studies, 35, 1–7
Occurrences of an adult female individual of the six-gill stingray in the shallow water of the Ohshima Island, Izu Islands, Japan [in Japanese], Report of Japanese Society for Elasmobranch Studies, 34, 17–19
Food habits of the six species of rays occurring at Pohnpei (Ponape) Island (E. Caroline Islands), FSM. Chondros, 5(1), 4–8
A study on the biology of rays occurring at Pohnpei Island, Caroline Islands. Proceedings of the 4th Indo-Pacific Fish Conference, Bankok: 87–107
Redescription, distribution and food habits of the Indo-Pacific dasyatidid stingray Himantura granulata. Japanese Journal of Ichthyology, 40(1), 23–28
Survey of rays in the Pohnpei Island, Federated States of Micronesia [in Japanese], Report of Japanese Society for Elasmobranch Studies, 28, 1–16