Angasi oyster

About this species

The southern mud oyster, Australian flat oyster, native flat oyster, native mud oyster, or angasi oyster, is endemic to southern Australia, ranging from Western Australia to southeast New South Wales and around Tasmania. Ostrea angasi superficially resembles Ostrea edulis and both species may be referred to with the name "flat oyster". However, the two species do not occur naturally in the same geographic distribution.

Text from the Wikipedia article “Ostrea angasi”, licensed CC BY-SA 4.0. Read the article

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 970 records
February: 540 records
March: 502 records
April: 383 records
May: 723 records
June: 521 records
July: 699 records
August: 388 records
September: 358 records
October: 384 records
November: 365 records
December: 791 records

Depth and water temperature

Depth

Mostly recorded at 0 m · Deepest record: 71.5 m

0–10 m: 279 records
10–20 m: 1 records
20–30 m: 0 records
30–40 m: 1 records
40–50 m: 2 records
50–60 m: 1 records
60–70 m: 2 records
70–80 m: 1 records

Water temperature

Recorded in surface water of 14–23 °C

12–14 °C: 22 records
14–16 °C: 47 records
16–18 °C: 1 records
18–20 °C: 9 records
20–22 °C: 9 records
22–24 °C: 2 records

Photos

(c) Gary Williams, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Gary Williams, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Terra Occ, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Rod Lowther, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Thomas Mesaglio, some rights reserved (CC BY) · CC BY · iNaturalist
(c) David Gobbett, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Angasi oyster, Australian flat oyster, Australian native oyster, Southern mud oyster, Australian mud oyster, Common Mud Oyster, Mud Oyster, native flat oyster, native mud oyster, Native oyster, Port Lincoln Oyster, Southern Flat Oyster, southern mud oyster, Stewart Island Oyster, Tasmanian Flat Oyster

Names in 1 more languages

German: Australische Flachauster, Australische Plattauster

Other scientific names: Monoeciostrea sudaustralis, Ostraea angasii, Ostrea rutupina

Similar species

Common oyster
Ostrea edulis
Bluff oyster
Ostrea chilensis
Crested oyster
Ostrea equestris
Ostrea subucula
Japanese Oyster
Magallana gigas
Leaf oyster
Dendostrea folium

Sources and credits

Names and taxonomy: WoRMS (CC BY 4.0) and the GBIF Backbone (CC BY 4.0). Photos: iNaturalist observers, each under the licence shown (CC0, CC BY or CC BY-SA).

Depth, temperature, months and maps: records from OBIS and GBIF under CC0 or CC BY.
Descriptions: Wikipedia, licensed CC BY-SA, each linked to its article.
Conservation status as published by GBIF (IUCN Red List).
876 open-data records from 1866 to 2018.
Species data updated November 5, 2026.