Murray Crayfish

Murray Crayfish - Euastacus armatus

Murray Crayfish - Euastacus armatus


The Murray Crayfish is endemic to the southern tributaries of the Murray-Darling Basin. They can be found in a variety of habitats, ranging from pasture-lands to sclerophyll forest, in a range of stream sizes and throughout a broad altitudinal range.


The species grows to more than 150 mm in carapace length; with the maximum size being 174 mm and 2.5 kg.


The Murray Crayfish is the largest of over 40 species in the genus Euastacus which represents freshwater 'spiny' crayfish; and is the second largest freshwater crayfish in the world. Individuals have a dark green to green-brown body. They have characteristic white claws and three rows of large white spines on each side of the tail; and males generally have larger claws while females have broader abdomens.

Species similar in appearance

Other Euastacus species.

The Murray Crayfish can be distinguished by its large size, white claws and white spines on each side of the tail.

Fisheries Scientific Committee determination

More information

This video highlights work of the Murray Crayfish recovery project

Watch a short video of Murray Crayfish at the edge of the Murray River - July 2017 (0.26 sec)