Hello!!
I live in Norway.
Here in europe long fin koi is not very common.
I have just received a long fin koi from Japan, that my koi dealer
arranged for me.
The breader is Yamazaki.
I think they look beutyfull!
I have tryed to find out hwat is the differense between standard koi and long fin koi.
I general they are the same rase / the same latin name.
beside the fins I found the below on Wikipedia.
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, pompom nostrils, and were hardier than koi. These were known in Japan as "onagaoi" or "hire naga koi", or translated in English "long tail koi". Randy LeFever, the son of Wyatt LeFever, a noted breeder of koi, is credited with suggesting they looked like butterflies, a trait for which the breed is named. They are also sometimes referred to as Dragon Koi. They do not get as big or live as long as normal Koi.
This left me with even more questiones
Hardier in what way??
Minimum temp they can survive??
How long do they live??
How large do they become??
All info is good info.