Head to head
Tadpole Madtom vs Brindled Madtom
A tadpole madtom and a brindled madtom are two closely related small catfish species, both carrying a genuinely venomous sting, that have settled into noticeably different kinds of water.
| Tadpole Madtom | Brindled Madtom | |
|---|---|---|
| Scientific name | Noturus gyrinus | Noturus miurus |
| Body shape | Stout, rounded, tadpole-like | Slender, mottled, saddle-blotched |
| Preferred water | Still, vegetated ponds and lakes | Streams with moderate current |
| Range | Broadest of any madtom species | Mississippi, Ohio, Great Lakes drainages |
| Venomous sting | Yes | Yes |
| Activity pattern | Nocturnal | Nocturnal |
| Adult size | About 8–10 cm | Small, similar range |
| Conservation status | Least Concern | Least Concern |
Tadpole Madtom vs Brindled Madtom: common questions
Why does the tadpole madtom prefer still water while the brindled madtom does not?
The tadpole madtom is unusual within its genus for tolerating and even favouring still or slow-moving vegetated water such as ponds and lakes, while the brindled madtom favours streams and rivers with slow to moderate current, a difference in habitat preference that has helped the tadpole madtom spread across a considerably broader range than most of its madtom relatives, including the brindled madtom.
Can both the tadpole madtom and brindled madtom sting you?
Yes, both species carry venom glands associated with grooved spines in their pectoral and dorsal fins, capable of delivering a genuinely painful sting if either fish is handled carelessly, though neither sting is considered medically dangerous to a healthy adult beyond localised pain and swelling.
How can you tell a tadpole madtom from a brindled madtom?
The tadpole madtom has a distinctly stout, rounded body that tapers quickly to a small tail, resembling a tadpole, while the brindled madtom has a more typically slender catfish shape marked with a dark, mottled, saddle-like blotch pattern, differences visible even before considering which type of water each fish was found in.