River) over a six-year period when there was a halving in the availability of their preferred boulder habitats due to sedimentation. Murray crayfish are listed as Data Deficient on the IUCN Red List, as vulnerable in the Australian Capital Territory, and as endangered in South Australia. References External links Murray Crayfish (Euastacus armatus) video on Youtube Freshwater crustaceans of Australia Vulnerable fauna of Australia Crustaceans described in 1866 Euastacus