Angelfish Variety · Domestic line-bred variety (wild type native to the Amazon basin)
Koi
White, orange and black blotches recall koi carp — often with an orange 'crown'.
By the WARN Research & Conservation TeamChecked against IUCN Red List & CITES sourcesLast updated
In brief
The Koi angelfish is a popular variety patterned in white, orange and black like koi carp, frequently with an orange patch (the 'crown') on the head. Orange tends to brighten when the fish is relaxed.
Koi: At a Glance
| Origin | Domestic line-bred variety (wild type native to the Amazon basin) |
|---|---|
| Size | Medium (to ~15 cm long and ~20 cm tall including fins) |
| Typical size | Body to ~15 cm long; very tall finnage |
| Lifespan | 8–10 years with good care |
| Pattern & fins | White body with orange and black blotches; orange head 'crown' |
| Temperament | Semi-aggressive cichlid; sociable in groups |
| Best suited to | Larger planted tanks (110+ L); peaceful, non-fin-nipping tankmates |
History & Origins
The Koi is a modern, much-loved variety derived from gold-marble genetics. Many koi angelfish show black 'pepper' speckling that varies with stress and light. The amount of orange and black differs between fish and can change over time.
Koi Fun Facts
- Koi angelfish are named for their resemblance to koi carp.
- Their orange often brightens when they feel secure.
- Black 'pepper' speckling can come and go with stress and light.
- Each fish's blotching is individual.
Koi Common Health Issues
Conditions seen more often in this breed, and how owners and vets help manage them. This is general guidance, not veterinary advice — always speak to your vet.
Ich (white spot disease)
A parasite producing white salt-like spots, flicking and rapid breathing — highly contagious between aquarium fish.
Care: Treat promptly with proprietary remedies and correct temperature and water quality; quarantine new fish.
Fin rot
Bacterial or fungal infection that frays and discolours the fins, usually triggered by poor water quality or injury.
Care: Improve filtration and water changes and treat with appropriate medication; remove sharp décor.
Swim bladder disorder
Problems with the gas-filled swim bladder leave fish floating, sinking or swimming oddly, often from overfeeding, constipation or poor water quality.
Care: Improve diet and water quality and avoid overfeeding; soak dry foods and fast briefly if constipation is suspected.
Help animals in need
World Animal Rescue Network funds partner-led rescue, veterinary care and protection programmes across South Asia, Southeast Asia and South America.
