American Paddlefish Identification Guide
Learn to recognize the American Paddlefish by its long paddle-shaped snout and smooth, scaleless skin.
Read the full American Paddlefish encyclopedia entry →
Key identification features
- Extremely long, flat, paddle-shaped rostrum making up nearly a third of total body length
- Smooth, scaleless, rubbery gray to bluish-gray skin
- Huge gill covers that flare back to near mid-body
- Tiny eyes and a wide, toothless mouth used for filter feeding
- Deeply forked, heterocercal (shark-like) tail
- Grows large, commonly 4-6 feet and over 60 pounds
Common look-alikes
- Chinese paddlefish (now extinct): had a narrower, blade-like rostrum that curved upward and a predatory diet, versus the American paddlefish's blunt, flattened paddle and filter-feeding habit.
- Sturgeons: sturgeons carry five rows of hard bony scutes along the body; paddlefish skin is completely smooth and scute-free.
- Shark species mistaken at a glance: sharks have visible gill slits and rough dermal denticles, not the paddlefish's soft skin and paddle snout.
Where you'll see one
Paddlefish inhabit large, slow-moving rivers, backwaters, and reservoirs of the Mississippi River basin, from Montana south to the Gulf of Mexico. They cruise open water with mouths agape, straining zooplankton with comb-like gill rakers rather than hunting along the bottom.
Frequently asked questions
How do I tell an American Paddlefish from a sturgeon?
Check the skin: paddlefish are smooth and scaleless with only a long paddle snout, while sturgeons have five rows of bony scutes running down the body and a shorter conical snout with barbels.
What's the easiest field mark for a paddlefish at a distance?
Look for the oversized, flattened paddle-shaped snout and the huge sweeping gill cover flap — no other North American river fish combines both features.