TankmateChecker

Can koi live with crayfish?

Verdict

Yes, with care

Yes, with care. Koi and crayfish can share a tank, but watch one thing. A grown koi may treat small crayfish as food, especially at night.

Koi

Koi59–77°F · pH 7–8.5

Crayfish

Crayfish65–77°F · pH 6.5–8

What to watch

Watch outA grown koi may treat small crayfish as food, especially at night.

What works

Both are fine at 65–77°F.
pH 7–8 suits both.

Water side by side

The green band is the temperature range both can live in.

The green band is the pH both tolerate.

Size to scale

Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

	Koi	Crayfish
Temperature	59–77 °F	65–77 °F
pH	7–8.5	6.5–8
Adult size	24.0 in	5.0 in
Minimum tank	Pond	20 gal
Temperament	Peaceful	Aggressive
Swims at	All levels	Bottom
Group	Groups of 3+	One per tank
Diet	Omnivore	Omnivore

Better tank mates for koi

All koi tank mates

Better tank mates for crayfish

All crayfish tank mates

Questions

Can koi live with crayfish?

Yes, with care. Koi and crayfish can share a tank, but watch one thing. A grown koi may treat small crayfish as food, especially at night.

What temperature suits both koi and crayfish?

65–77 °F. Koi need 59–77 °F, crayfish need 65–77 °F.

What size tank do koi and crayfish need together?

A pond. Koi outgrow indoor tanks.