Grass carp have scales.

You can differentiate between the common carp by look at the mouth and the barbels. Grass carp do not have a sucker mouth - more like a trout mouth and they do not have barbels on their mouth. Barbels resemble whiskers.

Grass carp are silvery and commons are generally a brown to yellow color.

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WDFW - Inland Fish Program
Region 5
Southwest Washington