Princess Royal Harbour was surveyed in January and March 2021. Seagrass species distribution (Posidonia australis, Posidonia sinuousa, Posidonia coriacea, Halophila sp., Ruppia sp., and Amphibolis sp.) and cover (as percentage cover classes: 0, <15%, 15-45%, 45-75%, >75%) was recorded across 263 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 photosynthetically active radiation (euphotic depth) were recorded. When observation locations were inaccessible by boat, sites were accessed from kayaks to make observations. The datasets making up the seagrass survey data are: PrincessRoyal_Seagrass - point dataset PrincessRoyal_Seagrass_Extent - polygon showing presence/absence PrincessRoyal_Seagrass_Cover - polygon showing % cover Layers: PrincessRoyal_Seagrass_Jan_2021 - PrincessRoyal_seagrass points where Year = '2021' PrincessRoyal_Seagrass_Extent_Jan_2021 - PrincessRoyal_seagrass_Extent where Year = '2021' PrincessRoyal_Seagrass_Cover_Jan_2021 - PrincessRoyal_seagrass_cover points where Year = '2021'

Princess Royal Harbour was surveyed in January and March 2021. Seagrass species distribution (Posidonia australis, Posidonia sinuousa, Posidonia coriacea, Halophila sp., Ruppia sp., and Amphibolis sp.) and cover (as percentage cover classes: 0, <15%, 15-45%, 45-75%, >75%) was recorded across 263 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 photosynthetically active radiation (euphotic depth) were recorded. When observation locations were inaccessible by boat, sites were accessed from kayaks to make observations. The datasets making up the seagrass survey data are: PrincessRoyal_Seagrass - point dataset PrincessRoyal_Seagrass_Extent - polygon showing presence/absence PrincessRoyal_Seagrass_Cover - polygon showing % cover Layers: PrincessRoyal_Seagrass_Jan_2021 - PrincessRoyal_seagrass points where Year = '2021' PrincessRoyal_Seagrass_Extent_Jan_2021 - PrincessRoyal_seagrass_Extent where Year = '2021' PrincessRoyal_Seagrass_Cover_Jan_2021 - PrincessRoyal_seagrass_cover points where Year = '2021'

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'

Hardy Inlet was surveyed by underwater drop camera observations in December 2018 and January 2020. Seagrass species distribution and cover (as percentage cover in categories: 0, 1-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. The canopy height (in 10 cm intervals) and epiphytic cover (as low, medium, high) of seagrass was also estimated. Macroalgae distribution and cover (as percentage cover in categories: 0, 1-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. At approximately a third of the sites, physical water profiles and secchi depth were recorded. The datasets making up the Hardy Inlet Seagrass Survey data are: Hardy_Seagrass - point dataset Hardy_Seagass_Extent - polygon showing presence/absence derived from points Hardy_Seagrass_Cover - polygon showing percentage cover derived from points Layers: Hardy_Seagrass_Dec_2018 - Hardy_seagrass points where Year = '2018' Hardy_Seagrass_Jan_2020 - Hardy_seagrass points where Year = '2020' Hardy_Seagrass_Extent_2018 - Hardy_Seagrass_Extent where Year = '2018' Hardy_Seagrass_Extent_Jan_2020 - Hardy_Seagrass_Extent where Year = '2020' Hardy_Seagrass_Cover_2018 - Hardy_Seagrass_Cover where Year = '2018' Hardy_Seagrass_Cover_Jan_2020 - Hardy_Seagrass_Cover where Year = '2020'

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'

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'

Hardy Inlet was surveyed by underwater drop camera observations in December 2018 and January 2020. Seagrass species distribution and cover (as percentage cover in categories: 0, 1-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. The canopy height (in 10 cm intervals) and epiphytic cover (as low, medium, high) of seagrass was also estimated. Macroalgae distribution and cover (as percentage cover in categories: 0, 1-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. At approximately a third of the sites, physical water profiles and secchi depth were recorded. The datasets making up the Hardy Inlet Seagrass Survey data are: Hardy_Seagrass - point dataset Hardy_Seagass_Extent - polygon showing presence/absence derived from points Hardy_Seagrass_Cover - polygon showing percentage cover derived from points Layers: Hardy_Seagrass_Dec_2018 - Hardy_seagrass points where Year = '2018' Hardy_Seagrass_Jan_2020 - Hardy_seagrass points where Year = '2020' Hardy_Seagrass_Extent_2018 - Hardy_Seagrass_Extent where Year = '2018' Hardy_Seagrass_Extent_Jan_2020 - Hardy_Seagrass_Extent where Year = '2020' Hardy_Seagrass_Cover_2018 - Hardy_Seagrass_Cover where Year = '2018' Hardy_Seagrass_Cover_Jan_2020 - Hardy_Seagrass_Cover where Year = '2020'

Hardy Inlet was surveyed by underwater drop camera observations in December 2018 and January 2020. Seagrass species distribution and cover (as percentage cover in categories: 0, 1-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. The canopy height (in 10 cm intervals) and epiphytic cover (as low, medium, high) of seagrass was also estimated. Macroalgae distribution and cover (as percentage cover in categories: 0, 1-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. At approximately a third of the sites, physical water profiles and secchi depth were recorded. The datasets making up the Hardy Inlet Seagrass Survey data are: Hardy_Seagrass - point dataset Hardy_Seagass_Extent - polygon showing presence/absence derived from points Hardy_Seagrass_Cover - polygon showing percentage cover derived from points Layers: Hardy_Seagrass_Dec_2018 - Hardy_seagrass points where Year = '2018' Hardy_Seagrass_Jan_2020 - Hardy_seagrass points where Year = '2020' Hardy_Seagrass_Extent_2018 - Hardy_Seagrass_Extent where Year = '2018' Hardy_Seagrass_Extent_Jan_2020 - Hardy_Seagrass_Extent where Year = '2020' Hardy_Seagrass_Cover_2018 - Hardy_Seagrass_Cover where Year = '2018' Hardy_Seagrass_Cover_Jan_2020 - Hardy_Seagrass_Cover where Year = '2020'

The Peel-Harvey Estuary was surveyed in March and April 2021 by underwater drop camera observations and/or observations through a viewing cone. Seagrass species distribution and cover (as percentage cover in categories: 0, 0-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. The canopy height (in 10 cm intervals) and epiphytic cover (as low, medium, high) of seagrass was also estimated. Macroalgae distribution and cover (as percentage cover in categories: 0, 0-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. At approximately a third of the sites, physical water profiles, photosynthetically active radiation (euphotic depth) and secchi depth were recorded. The datasets making up the Peel-Harvey Estuary Seagrass Survey data are: PeelHarvey_Seagrass - point dataset PeelHarvey_Seagass_Extent - polygon showing presence/absence derived from points PeelHarvey_Seagrass_Cover - polygon showing percentage cover derived from points Layers: PeelHarvey_Seagrass_Mar_2021 - PeelHarvey_seagrass points where Year = '2021' PeelHarvey_Seagrass_Extent_2021 - Hardy_Seagrass_Extent where Year = '2021' PeelHarvey_Seagrass_Cover_2021 - Hardy_Seagrass_Cover where Year = '2021'

The Peel-Harvey Estuary was surveyed in March and April 2021 by underwater drop camera observations and/or observations through a viewing cone. Seagrass species distribution and cover (as percentage cover in categories: 0, 0-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. The canopy height (in 10 cm intervals) and epiphytic cover (as low, medium, high) of seagrass was also estimated. Macroalgae distribution and cover (as percentage cover in categories: 0, 0-10%, 10-25%, 25-50%, 50-75%, 75-90%, 90-100%) were recorded. At approximately a third of the sites, physical water profiles, photosynthetically active radiation (euphotic depth) and secchi depth were recorded. The datasets making up the Peel-Harvey Estuary Seagrass Survey data are: PeelHarvey_Seagrass - point dataset PeelHarvey_Seagass_Extent - polygon showing presence/absence derived from points PeelHarvey_Seagrass_Cover - polygon showing percentage cover derived from points Layers: PeelHarvey_Seagrass_Mar_2021 - PeelHarvey_seagrass points where Year = '2021' PeelHarvey_Seagrass_Extent_2021 - Hardy_Seagrass_Extent where Year = '2021' PeelHarvey_Seagrass_Cover_2021 - Hardy_Seagrass_Cover where Year = '2021'