Can koi live with severums?

Verdict

No. Koi and severums should not share a tank. Koi are coldwater animals (59–77°F); severums need 74–84°F. They overlap only at 74–77°F, the edge of both ranges.

Koi59–77°F · pH 7–8.5

Severum74–84°F · pH 6–7

What to watch

Deal breakerKoi are coldwater animals (59–77°F); severums need 74–84°F. They overlap only at 74–77°F, the edge of both ranges.
Watch outWater chemistry is a squeeze. The only pH that suits both is around 7.

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	Severum
Temperature	59–77 °F	74–84 °F
pH	7–8.5	6–7
Adult size	24.0 in	8.0 in
Minimum tank	Pond	55 gal
Temperament	Peaceful	Semi-aggressive
Swims at	All levels	Middle
Group	Groups of 3+	Alone or in pairs
Diet	Omnivore	Omnivore

Better tank mates for koi

All koi tank mates

Better tank mates for severums