From Western Australia Government
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Oyster Harbour Seagrass Survey - Cover (DWER-109)

Created 23/06/2025

Updated 23/10/2025

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Oyster Harbour was surveyed in March 2019 and January 2021. Seagrass species distribution (Posidonia australis and Posidonia sinuousa) and cover (as percentage cover classes: 0, <15%, 15-45%, 45-75%, >75%) was recorded across 208-216 observations points across the estuary. The type of meadow (continuous or patchy), epiphytic cover on seagrass (as none, very low, low, medium, high or very high), and macroalgae cover (as percentage cover in categories: 0, <15%, 15-45%, 45-75%, >75%) were recorded at each site. At approximately a third of the sites, physical water profiles, secchi depth and euphotic depth were recorded. The datasets making up the seagrass survey data are: Oyster_Seagrass - point dataset Oyster_Seagrass_Extent - polygon showing presence/absence Oyster_Seagrass_Cover - polygon showing % cover Layers: Oyster_Seagrass_Mar_2019 - Oyster_seagrass points where Year = '2019' Oyster_Seagrass_Jan_2021 - Oyster_seagrass points where Year = '2021'

Oyster_Seagrass_Extent_Mar_2019 - Oyster_seagrass_Extent where Year = '2019' OR PERCCOVER = 'Licensed aquacture site - DPIRD - not surveyed' Oyster_Seagrass_Extent_Jan_2021 - Oyster_seagrass_Extent where Year = '2021' OR PERCCOVER = 'Licensed aquacture site - DPIRD - not surveyed'

Oyster_Seagrass_Cover_Mar_2019 - Oyster_seagrass_cover points where Year = '2019' OR PERCCOVER = 'Licensed aquacture site - DPIRD - not surveyed' Oyster_Seagrass_Cover_Jan_2021 - Oyster_seagrass_cover points where Year = '2021' OR PERCCOVER = 'Licensed aquacture site - DPIRD - not surveyed'

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Additional Info

Field Value
Title Oyster Harbour Seagrass Survey - Cover (DWER-109)
Language English
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/5877d019-270d-416d-856c-5d2524c38fea
Remote Last Updated 16/10/2025
Contact Point
Department of Water and Environmental Regulation
spatial.data@dwer.wa.gov.au
Reference Period 21/02/2022
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        117.94105301100001,
        -34.99908200999994
      ],
      [
        117.97886006400006,
        -34.99908200999994
      ],
      [
        117.97886006400006,
        -34.94381081499995
      ],
      [
        117.94105301100001,
        -34.94381081499995
      ],
      [
        117.94105301100001,
        -34.99908200999994
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Western Australia Government

Data Source

This dataset was originally found on Western Australia Government "Oyster Harbour Seagrass Survey - Cover (DWER-109)". Please visit the source to access the original metadata of the dataset:
https://catalogue.data.wa.gov.au/dataset/oyster-harbour-seagrass-survey-cover