- Koi fish is a variant of carp.
There are many koi fish in this pond.
Koi fish are very popular in Japan and many countries in Asia.
Koi fish can grow to be very large.
Koi fish come in many different colors.
Koi fish is a domestic ornamental carp.
Koi fish are very easy to raise.
There are koi fish in the pools of some palace buildings.
Some people think that keeping koi fish will bring good luck.
Niigata Prefecture in Japan began to raise koi on a large scale in the 17th century.