The site was identified as important in 2001 because it was regularly supporting significant populations of the species listed below, meeting ('triggering') IBA criteria.Populations meeting IBA criteria ('trigger species'):
|Species||Current IUCN Red List Category||Season||Year(s)||Population estimate at site||IBA criteria met|
|Great Cormorant Phalacrocorax carbo||LC||breeding||1992||302 individuals||A4i|
The current IUCN Red List category may differ from that which was valid at the time of IBA criteria assessment (2001).
|Habitat (IUCN level 1)||Habitat detail||Extent (% of site)|
|Land-use||Extent (% of site)|
BirdLife International (2023) Important Bird Area factsheet: Harbour Rocks. Downloaded from http://datazone.birdlife.org/site/factsheet/harbour-rocks-iba-canada on 10/12/2023.