Should I Put Crayfish in My Pond?

Crayfish can make a fun addition to your pond. They nibble on aquatic plants, so they help control weed growth. They eat decaying material, so they - along with Airmax MuckAway - will help keep pond muck to a minimum. ... These guys will dig to create burrows in the bottom of your pond - but don't worry.

Should you stock crawfish in a pond?

Stocking of new ponds is usually necessary, unless it is known beforehand that sufficient numbers of crawfish of the right species are present to serve as broodstock.

Will crayfish eat my koi?

Yeah, they will definitely attack your koi if they are medium or small sized.