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Selecting Tosai which can one day become jumbo koi takes exceptional skill, experience and a keen eye. However, there are a number of characteristics you should look for, which are highlighted below.

While those who are new to koi might be comfortable purchasing the first fish they come across, for Veteran koi breeders bloodlines are taken very seriously. This is because buying a fish from a respected bloodline greatly increases the likelihood that they will grow into jumbo quality show fish.

Some koi experts have discovered an interesting phenomenon: in ponds that use soft water, the fish appear to have superior growth rates than ponds that use hard water. Below is an explanation of this phenomenon and why it occurs.