Amur scaleless — a selectively bred scaleless (naked) line of the Amur carp (Cyprinus rubrofuscus). Large freshwater fish with an elongated, moderately deep, powerful body, a broad slightly arched back, and a rounded belly. Body length of adults 450–950 mm (up to 1200 mm), weight 1500–8500 g (usually 2500–5000 g at 4–6 years). Main distinguishing feature — complete or nearly complete absence of scales, thick mucous skin, shiny “bald” zone on the head and upper back. Standard proportions: body length / body height = 2.6–2.9 : 1, head length 24–28 % of body length, dorsal fin height 18–22 % of body length. Allowed colors: dark gray / gray-olive with bronze sheen, bronze-brown, and light gray with a pinkish tint; bright red, white, and leopard patterns are not allowed. Differs from the base species by the absence of cycloid scales, thicker skin, and higher body.