Recently, it becomes clear that the herbivorous fishes such as Rabbitfish eating seaweed too much is one of the main factors which cause the Isoyake (Sea deforestation) in the south part of Japan. Therefore we have to make decrease the inhabiting density of these fishes by fishing to preserve and expand the seaweed bed against over-eating by the herbivorous fishes. But there are few regions in Japan to catch herbivorous fishes as main targets of fishing, it has been hardly studied about the fishing methods of the herbivorous fishes at the Isoyake areas. To study effective fishing method of the herbivorous fish, I examined some cases of fishing for these fishes in every place in Japan. Many Rabbitfish were captured by the gillnet in Okinawa prefecture where most Rabbitfish are captured in Japan. The effective fishing method for the Rabbitfish by gillnet are particularly considered in this report.
