I got this from
http://www.nativefish.asn.au/spiny.html
hope this help
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Murray cray make spectacular aquarium specimens. Not usually available through the aquarium trade, capture from the wild is the only real option. Since minimum sizes apply, you will need a relatively large aquarium to successfully keep crayfish. Spiny crays are notorious escapologists and most would put Houdini to shame. Therefore you must ensure that you have a close fitting lid, preferably with a heavy object on top of it, to keep the very strong animal in the tank. One Native Fish Australia member returned home late one night to find his very large Murray cray several hundred metres down the road happily heading off for who knows where.
Relatively easy to keep, crays can be fed on small pieces of meat, earthworms, small pieces of carrot peel and the occasional piece of green vegetable matter, such a lettuce leaf, that has had its cell structure broken by freezing. A clean piece of heavy old wood, perhaps a bit of mallee root, will also be appreciated, and chewed on.
Crays will destroy anything in the tank made of plastic and will demolish air stones in quick order. A simple solution to this problem is to silicone a glass panel diagonally across one corner of the tank, leaving a 1-2 cm gap at the bottom and sufficient clearance at the top to allow for water flow, and to put any air stones etc behind it where the cray can't get at them. Whilst on the subject of crayfish's destructive habits, you should always handle them with extreme care as even quite modestly sized individuals are quite capable of removing the top of a finger with their pincers. <Ouch!>
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