Brett, have a look at the link below. I know very little about crays and almost nothing about the species in the US. This article talks about the Big Sandy Cray that is rapidly declining in Kentucky and almost disappeared in other regions. This might not be the same species but please have a read - might be significant.
http://newswatch.nationalgeographic.com/2012/03/23/big-sandy-crayfish-freshwater-species-of-the-week/
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