mirror carp

from The Century Dictionary.

• noun A variety of the common carp, Cyprinus carpio, in which the skin is mostly naked, but has patches of very large scales on the back and also above the anal fin, and on the tail and the posterior part of the lateral line.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun domestic carp with some large shining scales