Wish I knew what crayfish species I had before. I know it ate fish when young but when it became an adult, it lost much of it's interest in fish.
I just remember having a bunch of frozen fish pieces (that became useless). I would thaw one out and feed it to the crayfish (with tongs). The crayfish would grab the fish, then drop it. I tried offering live fish, no interest. So whatever species of crayfish this was, wouldn't catch and eat fish, when given the opportunity.
It would only eat pleco type sinking wafers as an adult. Didn't want frozen or live fish. Wish I knew what species it was . . . maybe it was just specific to that individual crayfish.