Extensive surveys have been conducted since 2009.Around 500 Japanese Murrelets were recorded on the Islands each year.
From these surveys It Is estimated thad the area supports at least 1,000 birds,,making It the second biggest concentration of this species, afther the BIROJIMA Islets of MAIYAZAKAJI Prefecture,KYUSHU,witch has an estimated population of 3,000 birds. Sex new breeding sites have also been confirmed,mostly from small uninhabited Islands.
The global population of Japanese Murrelet Is believed to be oil 5,000 to 10,000 birds (data Ew 1998). Japanese Murrelet Is threatened mainly by Invasive predators such as rodents on its breeding Islands,and crows that are attracted to discards by fishermen.
By catch In the nets and oil spills also threaten the species. In 2010, two uninhabited Islands In the IZU chain,the Tadanae-jima and Oonohara-jima,bot supporting breeding populations of Japanese Murrelet , were designated as national protected areas. WBS aims to use the results from these the surveys to advocate establishment of or protected areas,to help achieve the Aichi Targets set at the convention of Biodiversity meeting In Nagojya In 2010 that require 10% marine areas to be protected by 2020.