We conducted a research on behavioral patterns of different fish species in artificial reefs by attaching ultrasonic wave transmitters to jack mackerel Trachurus japonicas (total length ; 290-360mm) and red sea bream Pagrus major (total length : 228-249mm), which are migratory fish species, and scorpion fish Sebastiscus marmoratus (total length : 191-203mm) and rockfish Sebastes sp. (total length : 197-225mm), which are resident fish species. The behavioral research on fish species using ultrasonic biotelemetry technology enabled us to quantitatively identify gathering areas and residence periods of fish species in artificial reefs. Such data will help (i) scientifically evaluate effectiveness of development of fishing and breeding grounds utilizing artificial reefs and (ii) effectively set the size of efficient artificial reefs and formulate appropriate arrangement plans. It should be noted, however, that artificial reefs are used by diverse fish species, and that many artificial reefs are used primarily by young and immature fishes. Thus, to ensure behavior measurement of these fishes, it will be necessary to further reduce weight and size of ultrasonic wave transmitters and solve other problems including the limited recording time due to the battery capacity.