If it was injured or sick it may see the other as a weakness in its community
Yerrp they eat crayfish !!
Yes they do eat Crayfish
everglade frogs do not eat crayfish
Without much more information the question can not be answered accurately. Crayfish are scavengers and guppies are not their natural prey. If the crayfish is small enough and your guppies don't have long flowing fins then the guppies may well be too fast for the crayfish to catch. So the answer then would be none. Are you feeding the crays dead guppies? If so I would add one and see how long it takes the crayfish to eat it. Then I would add more and more dead guppies one at a time as the crayfish devours them. As the crayfish grows so it will eat more.
if its a blue moon crayfish your talking about, then no. they're territorial and aggressive, and they would attack and eat any fish you put in there. however, if it was, say, a loach, then the loach would eat the crayfish. if you had Mexican dwarf orange crayfish though, they can be housed with any type of fish that will not eat them. they're very calm and docile.
No Snapper do not eat Crayfish but they eat Kiwi and other Native animals.
Crayfish but not the type you would eat
Hot dogs are not part of the natural diet of a crayfish ! Hot dogs are processed meat, full of salt, fat and artificial additives - which a crayfish would never enounterin its natural environment !
Crayfish are not fish, and they love to eat fish if they can catch them.
crayfish eat tadpoles,snails,small fish, and insects.crayfish also eat plants and waterweeds
Crayfish eats Earthworms
Many things eat crayfish like sea eagles, sharks and larger fish