Tancho Koi Care Guide
Tancho is a koi variety: a white-bodied ornamental carp with a single red spot on the head, a long-lived pond fish requiring large volumes.
Overview
Tancho is a colour variety of ornamental koi, defined by a pure white body bearing a single red patch on the head; the name references the Japanese red-crowned crane. Koi are coloured varieties of carp developed in Japan from the 1820s, descended mainly from the Amur carp (Cyprinus rubrofuscus). They are large, long-lived fish kept primarily in outdoor ponds.
Taxonomy
- Family: Cyprinidae
- Genus: Cyprinus
- Scientific name: Cyprinus carpio (Tancho koi variety)
- Note: modern koi derive largely from Cyprinus rubrofuscus (Amur carp)
Habitat
The carp ancestor is native to Europe and Asia across the Black, Caspian and Aral Sea basins and has been introduced worldwide (FishBase). Carp are hardy fish of warm, slow-flowing waters with soft sediments, tolerating a wide temperature range. Koi are kept in ponds rather than indoor aquariums because of their size.
Tank requirements
- Minimum volume: 4000 L (pond)
- Temperature: optimal 15-25 °C (59-77 °F); the species tolerates a broad range
- pH: 7.0-8.5
- GH: 8-20 °dGH
- Lifespan: 25-50 years or more
Diet
Koi are omnivores. In nature carp feed on a variety of benthic organisms and plant material (FishBase). Koi accept a wide range of foods; Wikipedia notes feeding should stop when water temperature falls below about 10 °C, as their immune systems weaken in cold water.
Compatibility
Tancho koi are peaceful and typically kept with other koi. Because of their adult size and high bioload, they require a large, well-filtered pond rather than an aquarium, and are not suitable for planted setups as they uproot and consume vegetation.
Breeding
Carp are egg-scattering spawners. FishBase notes they are polygamous, with females laying very large numbers of eggs and spawning at around 15-20 °C, with eggs hatching in about four days. Colour outcomes such as Tancho cannot be reliably predicted from spawning.
Conservation status
IUCN Red List: Least Concern for wild Cyprinus carpio (assessed 2022), per FishBase. Koi are domesticated ornamental forms.