Isahaya bay

IBA Criteria

Year of most recent IBA criteria assessment: 2004

Populations of IBA trigger species
Species Current IUCN Red List Category Season Year(s) of estimate Population estimate IBA Criteria Triggered
Greater Scaup Aythya marila LC winter 2003 present A4i
A4iii Species group - waterbirds n/a winter 2003 min 20,000 individuals A4iii

Note: This table presents the IBA criteria triggered and the species that triggered then at the time of assessment, the current IUCN Red List category may vary from that which was in place at that time.

For more information about the IBA assessment process and criteria please click here

IBA Monitoring

Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2015 not assessed not assessed negligible
Was the whole site covered? Yes State assessed by unset
Accuracy of information -

IBA Protection

Protected Area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)
Honmyogawa 都道府県指定鳥獣保護区 2,445 protected area overlaps with site 0
Common fishery right area(Nagasaki) 共同漁業権区域 310,655 protected area overlaps with site 0


IUCN Habitat Habitat detail Extent (% of site)
Wetlands (inland) Intertidal mud, sand or salt flats -
For further information about the habitat classification please click here.

Recommended citation
BirdLife International (2022) Important Bird Areas factsheet: Isahaya bay. Downloaded from on 28/06/2022.