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I'm not sure if all crayfish are the same, but female crayfish typically have softer swimmerets (the appendages on the bottom of the tail). In males, the first pair of swimmerets (the first pair of appendages after the walking legs) are larger and look more like the walking legs. They're used in mating. The females carry the eggs in their swimmerets (under their tail).
I have no idea how many eggs they lay at a time or how hard they are to breed, but I teach a biology class, and one of the teachers keeps crayfish and has had them breed fairly easily. They use them for dissection sometimes.
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