Bowfin Identification Guide
Identify the bowfin by its long undulating dorsal fin, bony throat plate, and tail eyespot.
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Key identification features
- Stout, cylindrical body with an olive-green to brown mottled pattern
- Long, low dorsal fin running more than half the length of the body
- Rounded caudal fin
- Bony gular plate on the underside of the lower jaw, a distinctive throat feature
- Males typically show a dark eyespot ringed in orange or yellow at the base of the tail; females often lack the bright ring
- Can reach 60 to 90 cm
Common look-alikes
- Snakehead (invasive Channa species): lacks the bony gular plate and tail eyespot, and has a long anal fin that roughly mirrors the dorsal fin, unlike the bowfin's shorter anal fin
- Largemouth bass: has two separate dorsal fins, one spiny and one soft, while the bowfin has a single continuous, long dorsal fin
- Burbot: has a single chin barbel and a very different body profile with two dorsal fins, unlike the bowfin's long single dorsal fin and gular plate
Where you'll see one
Bowfin inhabit sluggish, vegetated rivers, swamps, and lakes across eastern and central North America, tolerating low-oxygen water thanks to their ability to gulp air at the surface.
Frequently asked questions
How do I tell a bowfin from an invasive snakehead?
Check under the jaw and near the tail: bowfin have a bony throat (gular) plate and often a tail eyespot, features that snakeheads lack.
How do I distinguish a bowfin from a bass by its fins?
Bowfin have one long, continuous dorsal fin running most of the body length, while bass have two clearly separate dorsal fins.