Redtail Catfish Identification Guide

Key identification features

• Large, robust body with a broad, flattened head
• Three pairs of long, prominent barbels around the mouth
• Dark brown to near-black coloring across the back and upper sides
• Cream to white belly with a crisp, straight line separating it from the dark upper body
• Vivid orange-red caudal fin, the feature giving the species its name
• Large adipose fin set well back near the tail

Common look-alikes

• Tiger shovelnose catfish: shows bold vertical dark bars or blotches over a pale body rather than a solid dark back, and its tail is banded, not solid red.
• Other large pimelodid catfish (piraiba, etc.): lack the sharply defined light-dark body demarcation and the orange-red tail entirely.

Where you'll see one

Redtail catfish inhabit the Amazon and Orinoco river basins of South America, where they favor large rivers, deep pools, and seasonally flooded forest margins. They are bottom-oriented ambush predators, typically found near submerged structure or in slow, deep water rather than fast riffles.