I've kept several species of native crayfish with native fish, and the only combination I would recommend is Cambarellus species (dwarf crays) with smallish community fish.
Larger crayfish, and Procambarus clarki (the red swamp crayfish) in particular, can be fish-murdering machines. Likewise many predatory fish will pick at crays; even if the cray is too big to swallow, they may pull its limbs off or just harass it to death. If I were going to keep fish and crayfish together long-term I would want a very large tank with lots of rockwork; that way, hopefully the two groups would interact as little as possible.