
Koi
Image: Hugo Sun (cc-by-nc)
NameKoi
Scientific NameCyprinus rubrofuscus
Common NamesKoi, Nishikigoi, Japanese Koi Carp
FamilyCyprinidae
OriginEast Asia, Japan
Temperamentpeaceful
Dietomnivore
Care Leveladvanced
Minimum Tank Size (Gallons)500
Max Size (Inches)36
Water TypeFreshwater
Temperature Range (°F)65-78
pH Range7.0-8.0
Compatible SpeciesGoldfish (large varieties), Plecos (large, temperate species), Sturgeon (temperate species), Orfes
Description
Koi are ornamental varieties of the Amur carp, selectively bred for their striking colors and patterns. They are large, long-lived fish primarily kept in outdoor ponds, known for their peaceful nature and ability to recognize their owners. Their impressive size and need for excellent water quality make them a significant commitment for dedicated pond keepers.





