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NFC: predator or scavenger?

Are crawfish predators or scavengers?  All my biology books describe them as 
exclusive scavengers but I've watched the ones in fish stores' feeder tanks 
picking off fish as they swim past.  Is this simply desperation because they 
don't have anything to eat, or a normal behavior?

I'd like to add a couple to the Visitor Center tank, but if they were to 
even think about eating any of the orangethroat darters, I'd have to boil 
'em :)...I've gotten REALLY attached to those fish.

What do you guys know about crawfish?  I'm at a loss here....I had no idea 
how many species there were in Colorado alone until I started talking to a 
DOW biologist.

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