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I'm glad to see other have contributed and hopeful more will.....
reports are best when they have many imputs/sources
koi growth is regulated by two things. the facility (size of the pond) and the genetics ( God given ability to grow big) this along with metobolism ( water temp
and digestion rate based on temp ) dictates the size. A big koi in american shows are into the lower 30's for inches and in japan closer to 40. Other areas like Taiwan and Thailand really can get large size quickly but then you run across the problem of pushing them out of their color. there needs to be a balance.
In Japan the kohaku is King for popularity and wins most shows hands down. That is because the judges select from that color variety class , showa and sanke. In America a few years back an Asagi was picked as Grand Champion in a regional show and created quite an uproar.The different color varieties and their popularity have a lot to do with individual tastes. A popular slogan in japan that you might want to quote is " Koi keeping begins and ends with Kohaku". The first color variety to be produced is my favorite-Asagi. New varieties are still being developed. many of them are named for the era of the emperior inwhich they were developed.
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