Uaru Identification Guide

Key identification features

• Large, disc-shaped, strongly laterally compressed body, similar in outline to a discus
• Juveniles show a cream to tan body covered in bold black blotches and stripes for camouflage
• Adults darken to a deep brown to maroon body with a large black triangular patch on the flank that tapers toward the tail
• Fins often show a pale, light-colored edging that contrasts with the darker adult body
• Small, terminal mouth adapted for grazing algae and soft plant matter
• Grows large for a discus relative, with adults reaching 25-30 cm

Common look-alikes

• Discus: has a rounder, more perfectly disc-shaped outline and lacks the bold dark triangular flank patch that defines adult uaru.
• Severum juveniles: show more distinct vertical barring rather than the blotchy, mottled camouflage pattern seen on juvenile uaru.
• Green terror juveniles: rounder-bodied and lack uaru's flattened disc shape along with its characteristic flank patch as it matures.

Where you'll see one

Uaru inhabits quiet, tannin-stained blackwater tributaries and seasonally flooded forest areas of the Amazon and Orinoco basins in South America. It is usually found in slow-current, heavily shaded water among submerged wood and leaf litter, often in loose groups.