Paddlefish Identification Guide
Identifying the paddle-shaped snout, shark-like tail, and scaleless skin of this ancient filter-feeding river giant.
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Key identification features
- Long, flattened, paddle-shaped rostrum (snout) that can make up nearly a third of total body length
- Smooth, scaleless, gray to bluish-gray skin, darker above and pale below
- Deeply forked, heterocercal (shark-like, uneven-lobed) tail fin
- Huge mouth used for filter-feeding, with tiny eyes set far forward near the base of the paddle
- Can grow very large, commonly 4-5 feet (120-150 cm) and over 60 lbs, with a smooth torpedo-shaped body
Common look-alikes
- Sturgeon — has bony scutes (armor plates) along the body and a shorter, conical or shovel-shaped snout rather than a flat paddle
- Alligator gar — long toothy jaws and hard diamond scales, completely unlike the paddlefish's smooth skin and rounded paddle
- Shovelnose sturgeon — shorter, flatter snout without the elongated paddle shape and bears rows of bony plates
Where you'll see one
Found in large, slow-moving rivers and connected reservoirs of the Mississippi River basin in the central United States, including the Missouri, Ohio, and Mississippi rivers themselves. Paddlefish cruise open water with mouths agape, swimming through plankton-rich currents rather than hugging the bottom.
Frequently asked questions
How do I tell a paddlefish from a sturgeon?
Check the skin and snout — paddlefish are smooth-skinned with a flat paddle-shaped snout, while sturgeon have rows of bony scutes and a shorter conical snout.
What is the most distinctive paddlefish feature?
The long, flat, paddle-shaped rostrum extending from the front of the head, unlike any other North American river fish.