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Lenses and Filters


One of the best investments you can make as an underwater photographer is in quality lenses. Your lens selection becomes even more important because not all lenses are practical for underwater photography. We have limited the lenses in this section to only the ones that are appropriate to underwater use.

Filters are attachments that go over the front of the lens. They produce photo effects and help reduce certain issues by 'filtering' what the lens sees. With digital photo enhancement the way it is today, many people don’t believe they need filters. However, there are just some things you cannot change, even with a photo editor. Underwater the camera needs the addition of a red filter to help correct your images from being all blue or all green. Every diver has noticed that the underwater environment is one of the monochromatic hues rather than distinct colours. Depending on your location, objects will take on a blue or green cast at the expense of all things yellow, orange, red, etc. This is because water acts as a filter of red light. The deeper you dive the more the red spectrum is filtered from the ambient light. You can, however, emphasise the existing red light by filtering out the blue spectrum with a red filter of the right hue for the water type and depth.

The Scuba Doctor is one of the largest dive retailers and mail order suppliers of new Scuba Gear and Underwater Lenses and Filters. The best combination of quality services, vast selection, knowledgeable staff and everyday low pricing.



Margarets Shellfish Reef

Reef Dive Reef Dive | Boat access Boat access

Inside Port Phillip Night Dive Site Open Water Rated Reef Dive Site

Depth: 8 m (26 ft) to 9 m (30 ft)

Margaret's Shellfish Reef is a cluster of four artificial, man-made shellfish reefs that lie 15 minutes by boat from inner Melbourne's Docklands pier under 10 metres of water in Hobsons Bay, Port Phillip. There four reefs are located as follows:

Shellfish Reef Approximate location (WGS84)
Margaret's Shellfish Reef, Hobsons Bay
Margaret's Shellfish Reef 1 (Main)
1,150 m2
Latitude: 37° 53.904′ S   (37.898392° S / 37° 53′ 54.21″ S)
Longitude: 144° 56.777′ E   (144.946286° E / 144° 56′ 46.63″ E)
Margaret's Shellfish Reef 2
512 m2
Latitude: 37° 53.937′ S   (37.898945° S / 37° 53′ 56.2″ S)
Longitude: 144° 56.746′ E   (144.945763° E / 144° 56′ 44.75″ E)
Margaret's Shellfish Reef 3
289 m2
Latitude: 37° 53.905′ S   (37.898417° S / 37° 53′ 54.3″ S)
Longitude: 144° 56.722′ E   (144.945364° E / 144° 56′ 43.31″ E)
Margaret's Shellfish Reef 4
306 m2
Latitude: 37° 53.935′ S   (37.898922° S / 37° 53′ 56.12″ S)
Longitude: 144° 56.799′ E   (144.946647° E / 144° 56′ 47.93″ E)
Margarets Shellfish Reef Dive Site Map
Margarets Shellfish Reef Dive Site Map | © The Scuba Doctor

 

Margaret's Reef is thriving with snapper, hulafish and oysters | The Nature Conservancy Australia, 12 Jul 2019

Do Not Anchor: Please do not anchor on the shellfish reefs, as this destroys the growing reef structure.
All recreational fishers and dive boat owners are asked to please do not anchor on or nearby the shellfish reefs, rather drift fish over the reefs.

Do Not Take Shellfish: Please do not take shellfish from the shellfish reefs, as this destroys the growing reef structure. All recreational fishers and divers are asked to please do not take shellfish on or nearby the shellfish reefs. Look, but don't touch.

Victorian Fisheries Authority (VFA) Shellfish Reefs in Port Phillip

Port Phillip once was home to extensive oyster and mussel reefs that supported a huge range of other sea life including fish, crabs, sea squirts, snails and sponges. Sadly, after many years of over exploitation, pollution, introduced species and disease, these shellfish reefs disappeared. The first series of the Port Phillip shellfish reefs restoration project begun in March 2017 and was completed in November 2018. The project is a partnership between the Victorian Government, The Nature Conservancy, The Thomas Foundation and the Albert Park Yachting and Angling Club, which aim to revitalise shellfish reefs in Port Phillip. Shellfish reefs are one of the world's most threatened marine habitats and once covered up to 50% of Port Phillip's seafloor.

The project has utilised limestone rubble, plus recycled shell from Victoria's restaurant industry, to construct the initial reefs near Geelong and St Kilda, which were selected due to their suitability as they were originally home to shellfish reefs at the time of colonisation.

Shellfish reefs provide nursery habitat and overtime will boost fish numbers, clean water and enhance marine biodiversity, which is good news for the environment and recreational fishers. Port Phillip is home to a vibrant snapper, whiting, calamari and flathead fishery, which will all benefit from the reefs.

Each year, one hectare of oyster reef:

  • Filters 2.7 billion litres of sea water
  • Removes 275 kg of Nitrogen and Phosphate
  • Produces 375 kg of fish
  • Is home to over 100 marine species
  • Recycles 100 m3 of shell

Port Phillip Shellfish Reef Locations

On 22-Mar-2021, The Nature Conservancy provided us with the following detailed information about the location of the shellfish reefs in Port Phillip. Typically each designated reef location is a cluster of one or more separate shellfish reefs. We've picked one reef in each cluster to use as the main location for the reef. This means it's the approximate centre point of an actual shellfish reef, not just an arbitrary location within the area of the cluster of separate reefs. The following table gives you the approximate centre point of each shellfish reef, plus which the one we've picked to be the main location for each cluster.

Shellfish Reef Approximate location (WGS84)
St Helens Shellfish Reef, Geelong
(aka Mervs Reef)
Latitude: 38° 7.177′ S   (38.11961667° S / 38° 7′ 10.62″ S)
Longitude: 144° 21.675′ E   (144.36125° E / 144° 21′ 40.5″ E)
Outer Harbour Shellfish Reef, Corio Bay
(aka Moolap Reef)
Latitude: 38° 6.366′ S   (38.1061° S / 38° 6′ 21.96″ S)
Longitude: 144° 28.570′ E   (144.47616667° E / 144° 28′ 34.2″ E)
Kirk Point Shellfish Reef, Western Port Phillip
(aka Wilsons Reef)
Latitude: 38° 3.436′ S   (38.05726667° S / 38° 3′ 26.16″ S)
Longitude: 144° 36.588′ E   (144.6098° E / 144° 36′ 35.28″ E)
9ft Bank Shellfish Reef, Corio Bay
9ft Bank Shellfish Reef 1 (Main)
16,080 m2
Latitude: 38° 6.012′ S   (38.1002° S / 38° 6′ 0.72″ S)
Longitude: 144° 26.931′ E   (144.44885° E / 144° 26′ 55.86″ E)
Dromana Shellfish Reef, Eastern Port Phillip
Dromana Shellfish Reef 1
466 m2
Latitude: 38° 19.640′ S   (38.327331° S / 38° 19′ 38.39″ S)
Longitude: 144° 57.002′ E   (144.950028° E / 144° 57′ 0.1″ E)
Dromana Shellfish Reef 2
274 m2
Latitude: 38° 19.665′ S   (38.327751° S / 38° 19′ 39.9″ S)
Longitude: 144° 57.008′ E   (144.950131° E / 144° 57′ 0.47″ E)
Dromana Shellfish Reef 3
502 m2
Latitude: 38° 19.659′ S   (38.327653° S / 38° 19′ 39.55″ S)
Longitude: 144° 57.045′ E   (144.95075° E / 144° 57′ 2.7″ E)
Dromana Shellfish Reef 4 (Main)
494 m2
Latitude: 38° 19.637′ S   (38.327281° S / 38° 19′ 38.21″ S)
Longitude: 144° 57.048′ E   (144.950793° E / 144° 57′ 2.85″ E)
Dromana Shellfish Reef 5
256 m2
Latitude: 38° 19.620′ S   (38.326993° S / 38° 19′ 37.17″ S)
Longitude: 144° 57.039′ E   (144.950645° E / 144° 57′ 2.32″ E)
Margaret's Shellfish Reef, Hobsons Bay
Margaret's Shellfish Reef 1 (Main)
1,150 m2
Latitude: 37° 53.904′ S   (37.898392° S / 37° 53′ 54.21″ S)
Longitude: 144° 56.777′ E   (144.946286° E / 144° 56′ 46.63″ E)
Margaret's Shellfish Reef 2
512 m2
Latitude: 37° 53.937′ S   (37.898945° S / 37° 53′ 56.2″ S)
Longitude: 144° 56.746′ E   (144.945763° E / 144° 56′ 44.75″ E)
Margaret's Shellfish Reef 3
289 m2
Latitude: 37° 53.905′ S   (37.898417° S / 37° 53′ 54.3″ S)
Longitude: 144° 56.722′ E   (144.945364° E / 144° 56′ 43.31″ E)
Margaret's Shellfish Reef 4
306 m2
Latitude: 37° 53.935′ S   (37.898922° S / 37° 53′ 56.12″ S)
Longitude: 144° 56.799′ E   (144.946647° E / 144° 56′ 47.93″ E)
Wilson Spit Shellfish Reef, Western Port Phillip
Wilson Spit Shellfish Reef 1
621 m2
Latitude: 38° 7.132′ S   (38.118861° S / 38° 7′ 7.9″ S)
Longitude: 144° 30.403′ E   (144.506712° E / 144° 30′ 24.16″ E)
Wilson Spit Shellfish Reef 2
344 m2
Latitude: 38° 7.169′ S   (38.119483° S / 38° 7′ 10.14″ S)
Longitude: 144° 30.389′ E   (144.50648° E / 144° 30′ 23.33″ E)
Wilson Spit Shellfish Reef 3
683 m2
Latitude: 38° 7.180′ S   (38.119672° S / 38° 7′ 10.82″ S)
Longitude: 144° 30.218′ E   (144.503625° E / 144° 30′ 13.05″ E)
Wilson Spit Shellfish Reef 4
890 m2
Latitude: 38° 7.200′ S   (38.120006° S / 38° 7′ 12.02″ S)
Longitude: 144° 30.227′ E   (144.50378° E / 144° 30′ 13.61″ E)
Wilson Spit Shellfish Reef 5
260 m2
Latitude: 38° 7.148′ S   (38.119135° S / 38° 7′ 8.89″ S)
Longitude: 144° 30.264′ E   (144.504398° E / 144° 30′ 15.83″ E)
Wilson Spit Shellfish Reef 6
501 m2
Latitude: 38° 7.200′ S   (38.119997° S / 38° 7′ 11.99″ S)
Longitude: 144° 30.276′ E   (144.504602° E / 144° 30′ 16.57″ E)
Wilson Spit Shellfish Reef 7 (Main)
276 m2
Latitude: 38° 7.159′ S   (38.11931° S / 38° 7′ 9.52″ S)
Longitude: 144° 30.309′ E   (144.505156° E / 144° 30′ 18.56″ E)
Wilson Spit Shellfish Reef 8
364 m2
Latitude: 38° 7.189′ S   (38.119809° S / 38° 7′ 11.31″ S)
Longitude: 144° 30.346′ E   (144.505764° E / 144° 30′ 20.75″ E)
Wilson Spit Shellfish Reef 9
532 m2
Latitude: 38° 7.131′ S   (38.118842° S / 38° 7′ 7.83″ S)
Longitude: 144° 30.357′ E   (144.505942° E / 144° 30′ 21.39″ E)

 
Use this KML file to view all of the Port Phillip Shellfish Reef GPS marks supplied by The Nature Conservancy: Port Phillip Shellfish Reef Map. You can use Google Earth to open it and view a layer with polygons of where each restored reef is located. There is also another layer that gives a centre point for each shellfish reef.

Do Not Anchor: Please do not anchor on the shellfish reefs, as this destroys the growing reef structure.
All recreational fishers and dive boat owners are asked to please do not anchor on or nearby the shellfish reefs, rather drift fish over the reefs.

Do Not Take Shellfish: Please do not take shellfish from the shellfish reefs, as this destroys the growing reef structure. All recreational fishers and divers are asked to please do not take shellfish on or nearby the shellfish reefs. Look, but don't touch.

Port Phillip Shellfish Reefs
Shellfish reef restoration sites in Port Phillip. Red fish symbol highlights new sites for 2020 reef build. | Source: VRFish

What Do The Shellfish Reefs Look Like?

The project has utilised limestone rubble and recycled shell from Victoria's restaurant industry to construct the shellfish reefs at sites which were selected due to their suitability as they were originally home to shellfish reefs at the time of colonisation.


Restoring the lost shellfish reefs of Port Philip | The Nature Conservancy Australia, 14 Jun 2017


Shellfish Reef Restoration Overview and Progress at Port Phillip, Victoria | The Nature Conservancy Australia, 6 Feb 2019


'Restore The Bay' Information Session - Port Phillip, Victoria | The Nature Conservancy Australia, 27 May 2020

Infographic: Beneficiaries of Shellfish Reefs
Infographic: Beneficiaries of Shellfish Reefs. | Source: The Nature Conservancy Australia

Indigenous Use of Shellfish

Aboriginal kitchen middens were common around Victoria's bays, estuaries and coastal areas. Carbon-dating of shells from middens indicates that the practice of shellfish harvesting by indigenous peoples goes back at least 10,000 years in coastal areas of Victoria. Over 350 coastal shell middens have been recorded for the Bellarine and Mornington Peninsula (Port Phillip) and Phillip Island (Western Port) areas alone. There are middens still observable within the Melbourne metropolitan area of Sandringham and Brighton, but unfortunately many middens sites have been lost to urban and coastal development.

See also, VFA: Shellfish Reefs,
VFA: Shellfish Reefs Revitalisation,
Victoria's lost reefs rediscovered and
Rebuilding Australia's lost shellfish reefs.

Boon Wurrung / Bunurong country
Boon Wurrung / Bunurong country

Traditional Owners — This dive site is in the traditional Country of the Boon Wurrung / Bunurong people of the Kulin Nation. This truly ancient Country includes parts of Port Phillip, from the Werribee River in the north-west, down to Wilson's Promontory in the south-east, including the Mornington Peninsula, French Island and Phillip Island, plus Western Port. We wish to acknowledge the Boon Wurrung as Traditional Owners. We pay respect to their Ancestors and their Elders, past, present and emerging. We acknowledge Bunjil the Creator Spirit of this beautiful land, who travels as an eagle, and Waarn, who protects the waterways and travels as a crow, and thank them for continuing to watch over this Country today and beyond.

 

Margarets Shellfish Reef Location Map

Latitude: 37° 53.904′ S   (37.898392° S / 37° 53′ 54.21″ S)
Longitude: 144° 56.777′ E   (144.946286° E / 144° 56′ 46.63″ E)

Datum: WGS84 | Google Map
Added: 2021-03-14 13:57:06 GMT, Last updated: 2021-05-14 21:53:28 GMT
Source: The Nature Conservancy
Nearest Neighbour: Point Ormond Reef, 3,168 m, bearing 57°, ENE
Artificial shellfish reef installed to improve recreational fishing.
Depth: 8 to 9 m.



DISCLAIMER: No claim is made by The Scuba Doctor as to the accuracy of the dive site coordinates listed here. Should anyone decide to use these GPS marks to locate and dive on a site, they do so entirely at their own risk. Always verify against other sources.

The marks come from numerous sources including commercial operators, independent dive clubs, reference works, and active divers. Some are known to be accurate, while others may not be. Some GPS marks may even have come from maps using the AGD66 datum, and thus may need be converted to the WGS84 datum. To distinguish between the possible accuracy of the dive site marks, we've tried to give each mark a source of GPS, Google Earth, or unknown.

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