Featherback Knifefish Identification Guide

Key identification features

• Laterally compressed, knife-shaped body with a smoothly arched back and a tapering profile toward the tail
• Long, ribbon-like anal fin fused with a small tail, forming one continuous fin edge from the belly to the tail tip
• Small, separate dorsal fin set roughly mid-back
• Uniform bronze-gray to olive coloration without spots or blotches, sometimes with a faint silvery sheen on the flanks
• Small, upturned mouth and a slender, tapering head
• Reaches about 12-24 inches, smaller than most other knifefish species

Common look-alikes

• Clown knifefish: grows much larger and shows a row of bold, dark eye-spots along the rear body, which the featherback lacks entirely
• African featherfin knifefish: has an elongated, feathery dorsal fin running nearly the full body length, versus the short stub-like dorsal fin seen on the featherback

Where you'll see one

Featherback knifefish inhabit slow rivers, ponds, canals, and flooded rice paddies across South and Southeast Asia. They are mostly nocturnal, spending daylight hours hidden among submerged vegetation, roots, and debris before emerging at dusk to hunt small fish and invertebrates.