Wels Catfish Identification Guide

Key identification features

• Massive, elongated, entirely scaleless body tapering sharply to a small, flattened tail
• Broad, flat head with tiny eyes and an extremely wide mouth lined with rows of fine teeth
• Two long barbels on the upper jaw alongside four shorter barbels on the lower jaw and chin, six total
• Mottled greenish-brown to nearly black coloration on the back and upper flanks, paler and blotchy on the sides, with a pale belly
• Long anal fin running most of the length of the underside, paired with a small, rounded dorsal fin set far forward near the head
• One of Europe's largest freshwater fish, with old individuals exceeding 2-3 meters and over 100 kg

Common look-alikes

• Channel catfish and other North American catfish: have eight barbels rather than the wels' six, and an adipose fin behind the dorsal fin that the wels lacks.
• European eel: has one continuous fin fringe along the back, tail, and belly, with no barbels, unlike the wels' separate fins and prominent whiskers.
• Sturgeon: shows rows of bony armored plates (scutes) instead of the wels' smooth, scaleless skin.

Where you'll see one

Wels catfish inhabit large, slow-flowing rivers, lakes, and reservoirs across central and eastern Europe and western Asia, favoring deep pools and cover such as sunken timber. Introductions have also established populations elsewhere in western Europe.