Gudgeon Identification Guide

Key identification features

• Small, elongated, cylindrical bottom-dwelling fish, usually 10–15 cm
• One pair of short barbels at the corners of the mouth (a key diagnostic point)
• Sub-terminal mouth set beneath a rounded snout
• Mottled brown-olive blotches running along silvery-gold flanks
• Thick lips suited to sifting the substrate
• Rounded fins with faint speckling on the dorsal and tail

Common look-alikes

• Stone Loach: has multiple barbels (up to six) rather than one pair, a flattened head, and a scaleless-looking smooth skin
• Spined Loach: shows a small erectile spine beneath the eye and a slimmer, more laterally compressed body
• Young Barbel: has barbels too, but grows much larger with a more streamlined body and no blotchy flank pattern

Where you'll see one

Gudgeon are found over clean gravel and sandy bottoms of rivers, streams, and lakes across Europe and much of Asia. They typically shoal close to the substrate in shallow, moderately flowing water, often stirring up small clouds of sediment as they forage.