|Oyster Harbour at a glance|
|Average annual catchment rainfall:||1100 millimetres|
|Harbour area:||15.6 square kilometres|
The habitat value is very high, with extensive mudflats, seagrass beds, fringing forests, sedgelands and saltmarsh, although little of this habitat has been reserved for conservation. Oyster Harbour is used by thousands of waterbirds for feeding, and is the only known habitat of the bivalve mollusc Anadara trapezia in Western Australia.
Oyster Harbour has undergone a major loss of seagrass beds over the last decade. This has been caused by the smothering effect of excessive algae growth, sustained by the huge quantity of nutrients that are washed into the Harbour each winter from the fertilised catchments of the Kalgan and King Rivers.
Albany Waterways Resource Book: Water and Rivers Commission 1999
South Coast Regional Land and Water Care Strategy: The Albany Hinterland Sub-region. Prepared by the South Coast Regional Assessment Panel and the South Coast Regional Initiative Planning Team: December 1996