How long do crayfishes live?

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Ummmmm...I'll take a guess and say a good few years. Obviously less if you buy them as adults. They are hardy little beasts.
 
Mostly 2 to 5 years in general for most species though this is very influenced by temperature and obviously water conditions. Majority of people that I have spoken with about crayfish have difficulty keeping them for more than a year.
 
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