Head to head
Stonecat vs Margined Madtom
A stonecat and a margined madtom are both small catfish within the same madtom group of North American streams, sharing venomous spines and a nocturnal, rock-sheltering lifestyle, yet the two differ noticeably in both size and the seriousness of their sting.
| Stonecat | Margined Madtom | |
|---|---|---|
| Scientific name | Noturus flavus | Noturus insignis |
| Relative size | Largest madtom species | Smaller, more typical madtom size |
| Sting severity | Genuinely painful | Mild but irritating |
| Identifying feature | Large body size | Dark border along the fins |
| Range | Eastern and central US, Canada | Eastern US, Atlantic slope |
| Activity pattern | Nocturnal | Nocturnal |
| Parental care | Male guards eggs and young | Male guards eggs and young |
| Conservation status | Least Concern | Least Concern |
Stonecat vs Margined Madtom: common questions
Which is worse, a stonecat sting or a margined madtom sting?
A stonecat's sting is considerably worse, described as genuinely painful thanks to venom glands potent enough to stand out even among madtom catfish, while the margined madtom's sting is milder, still irritating if the fish is handled carelessly but far less severe than the stonecat's.
How can you tell a stonecat from a margined madtom?
Size is the clearest giveaway, since the stonecat is the largest species within the madtom group and noticeably bigger than the margined madtom, which instead is identified by a distinctive dark border along its dorsal, adipose, and tail fins.
Do both of these catfish take care of their young?
Yes, in both species a male guards the eggs after spawning, typically within a nest beneath a rock, and continues protecting the young for a period after hatching, a shared form of parental care common among madtom catfish generally.