This Marine IBA is identified using seaward extensions around breeding colonies. It originates from the Japan Exclusive Economic Zone (EEZ) and falls within the Pacific, Northwest FAO ocean region. The site covers an area of 909 km2 and is 98 km away from the closet coastline. The depth ranges from 8 to 703 m, mean annual sea surface temperature falls between 23.19 and 23.66 °C and mean annual chlorophyll-a concentrations found to range between 0.3 and 0.36 mg/m3.
1 species triggers IBA criteria at this Marine IBA. Seaward extensions around breeding colony; Kusagaki islets include key near-colony areas for breeding populations of Streaked Shearwater (LC).
BirdLife International (2020) Important Bird Areas factsheet: Kusagaki islets - Marine. Downloaded from http://www.birdlife.org on 21/02/2020.