Common carp have several different types of mutations that include leather carp (no scales) mirror carp (large spotty scales) and several others. They actually have a rather high mutation rate and new forms of mutations are continually being formed while others are becoming even more common like mirror carp. In some areas I believe they are close to 10% of all common carp. I've personally shot 1 leather and one mirror. Neither were full mutations but it was present.
That's a gold carp or a koi. It's basically just a color phase of a common carp that formed into its own sub species. That's still a huge one though. These are goldfish.
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