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i don't think tattooing hurts a koi, it just can not be done to make the koi more attractive, difficult to get exact lines, from my experience.
most koi are not lucky enough to get tattooed. the vast majority die from disease or predators or being culled. the culled are sometimes just thrown aside to rot, but they are a good soruce of protien so many are not wasted in that manner.
a whole lot of koi have to die to grow one pretty one. relatively speaking, tattooing is not cruel to koi. and i don't think it will catch on, it is time consuming and difficult and i have never been able to improve the looks of even an ugly white one.
i have read on this forum where people do cosmetic surgery on koi to remove blemishes, black spots, clean up pattern lines, etc. i have even heard that you will seldom see a gc that has not been cosmetically altered.
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