This article is incorrect and misleading in so many ways.  The term "mirror carp" is a colloquial term that refers to common carp with sporadic coverage of large scales.  Controlled by recessive alleles, this scale pattern can occur intermittently in wild (feral) populations and can also be selected for in domesticated populations.  The subspecies Cyprinus carpio carpio refers to the European common carp and not solely to fish that express the mirror phenotype.   

 This article should be retitled and rewritten to "European Common Carp" or a similar name to reflect the subspecies Cyprinus carpio carpio.  Information on the scaled, mirror, and leather scale type variations should be moved to the "Common Carp" article.  I apologize, but I don't know enough about Wikipedia and I don't have the time to make such large changes myself.