Crayfish in the pond

[RogerMcAllen]

I was cleaning the bottom of my pond and came across two crayfish claws, the rest of him must be inside one of my cats. My only concern is whether a live crayfish could do damage to my fish, or are the healty ones in general fast enough to escape harm?

 

[Guest]

They may catch a few fry, or sick fish, but most will be fine. crayfish can be very destructive to plants though, or so I've heard.