It kinda matters. Mostly 25 inches, or more.
a koi carp can grow as big as a pond
they grow bigg around 12 inches
A young koi is about 3-7 inches. when they grow to adulthood, they can as long as 40 inches!
Koi can live for hundreds of years in that period of time they will grow 3 ft. it just takes them a while to get there.
It depends how big your Koi is and how big the Catfish is. If the catfish can fit in the Koi's mouth than it will get eaten.
1 for like 5 months or so it will grow too big in about a year
a koi can live for hundreds of years if there maintained right. in that period of time they will grow 3 ft.
25-35 years
I think it's KOI I have a friend who's is a really big koi lover. He is very adamant about the fact that koi are not goldfish!
The size of the koi will depend on many factors such as what type of koi it is, how much and what you feed it and the size of the aquarium or pond you keep it in.
Depends on how big they are, but you have to remeber they will grow big i would suggest no more then two. I have 2 in mine right now and they are fine with that but they are still 6inchs once they reach 20'' they probable wont enjoy that much and might slow there growth.
A Koi should grow around 6 to 8 inches long in its first year. By age 3 it should be about 24 inches long. I guess that's a reasonable growth rate