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All koi originated in that region, maybe someone remembers the thread about the origins of carp and koi...
the main difference is number of quality parents available, experience in matching them, and water and care methods. Culling plays a role to a certain degree, but I think it is more down to when you hope to sell than necessarily culling skill....most american breeders hope to sell small so they can eat that year......Japanese breeders have been established for generations and therefore do not having the expense of facility development, and have been in it long enuf to have that cushion in their biz so they grow out longer on average.
Most american breeders would have difficulty growing out huge numbers in facilities with water quality adequate to observe and maintain maximum growth. That is why God created the Carribean and our 364 day a year growing season with soft water aquifers and low ph in our wells. I give the koi christmas off, and they get to have an easter egg hunt on easter if they r good and make the eggs.
Resources, experience, and water quality. The dna strains are the same now.
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