- "I caught a koi! Can't play koi with me!"
An information board in the aquarium will provide information about this fish.
"Though typically pale in color, these aquarium fish also can be found with rather beautiful patterns. This is all thanks to very selective breeding of carp with genetic mutations, allowing for diversity. No two koi have the exact same pattern and are popularly known as "swimming jewels" as a result. They can be sold for a very high price, depending on their coloring and pattern. If properly cared for, they can live for over 100 years, making them a staple for outdoor garden ponds."
In real life
Koi (鯉), more often known as Nishikigoi (meaning brocaded carp), is an ornamental fish of the Common Carp variety that is not known to occur naturally in the environment, at least not in its more colourfully distributed colourations. The colours of Koi are from mutations in wild Carp, and fish are hybridized and interbred to form the appearances we know today.
Ornamental Koi are generally much different in shape from their ancestor, the Carp, and most colourations are very slender and average much smaller overall.
The well-known colouration of orange and black spots is known as Kohaku, and they are usually found in private and public aquariums and are mainly for viewing purposes. Much like the Goldfish, the Koi is also interbred from specially selected Carp. Unlike the Goldfish however, Koi descended from Common Carp (Cyprinus carpio) whereas the former are bred from Crucian Carp. They are omnivores, feeding mainly on insects and algae, much like their wild alternative. The name ‘Koi’ comes from the Japanese word for ‘carp.’