I have a koi pond at home.  Koi are considered colored varieties of Amur carp.
Oh interesting, Ive been actually wanting to get some for my small pond, Are they hard to take care of? 
Not really.  They are coldwater fish and they have a great ability to adapt to many different climates. 
Oh very nice, I suppose they would be a good fish choice then, How big do they generally get? 
Koi are pretty small, similar to goldfish.  They stand out due to their patterning and coloration.
Oh got ya, I have seen them before at our local park, there is a giant pond there, How long do they love for? 
I really do not know.  I do know that they originated in East Asia back in 5th century BC.
Sorry I meant to say live but I know they are quite popular in Japan, Any other cool koi facts that I should know?
Butterfly Koi
Butterfly koi, longfin koi, or dragon carp are a type of ornamental fish notable for their elongated finnage. The fish are a breed of the common carp, "Cyprinus carpio", which includes numerous wild carp races as well as domesticated koi ("Nishikigoi").
Butterfly koi originated in the mid-20th century as a result of an effort to increase the hardiness of traditional koi. Japanese breeders interbred wild Indonesian longfin river carp with traditional koi. The resulting fish had longer fins, long barbells,
group of fish originally found in Central Europe and Asia. Various carp species were originally domesticated in East Asia, where they were used as food fish. Carp are coldwater fish, and their ability to survive and adapt to many climates and water conditions allowed the domesticated species to be propagated to many new locations, including Japan. Natural color mutations of these carp would have occurred across all populations. Carp were first bred for color mutations in China more than a thousand years ago, where selective breeding of the Prussian carp ("