Mebbid
Aquarium Advice Addict
Apparently, these are uber popular in Japan, where the mutation was created. When I asked the store clerk if this was a mutation, he told me that goldfish are all mutations, which I guess is true. They are all mutated carp.
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There's a difference between breeding for colors and breeding for body deformities. Properly line breeding fish to change their colors doesn't harm the fish. These deformities are a completely different matter.
Just like Parrot cichlids I would put money on these fish not living normal lives.