A late post...
I bought this juvenile kohaku back when I opened my pond late in 2016.
Sort of the time when I stocked the new pond with whatever fish I can throw in for no trouble money to make it run and cycle.
It grew steadily from 27cm into a 65cm koi in the course of 2,5 years.
Not a very fast growing fish compared to some standards, but IMHO good in terms of growth quality with satisfying body structure, and overall skin traits.
The only downside is the pattern. But then again I got the fish for extremely good price, so I cant complain.
A starter fish, ended up being a nice keeper