Head to head
Central Stoneroller vs Redside Dace
The central stoneroller and redside dace are both small stream-dwelling minnows found across parts of the central and eastern United States, but each has evolved a specialised feeding trick well outside what most minnows bother with.
| Central Stoneroller | Redside Dace | |
|---|---|---|
| Scientific name | Campostoma anomalum | Clinostomus elongatus |
| Feeding strategy | Scrapes algae off rocks | Leaps to catch flying insects |
| Jaw adaptation | Hard, cartilaginous ridge | Large, upturned mouth |
| Breeding male display | Crown of head tubercles | Vivid red-orange side stripe |
| Habitat | Clear, rocky streams | Cold, clear headwater streams |
| Population trend | Stable | Decreasing |
| Conservation status | Least Concern | Near Threatened |
| Diet | Herbivore | Insectivore |
Central Stoneroller vs Redside Dace: common questions
How do the central stoneroller and redside dace feed differently?
The central stoneroller has a hard, cartilaginous ridge along its lower jaw built specifically for scraping algae directly off rocks on the stream bottom, while the redside dace has an unusually large, upturned mouth that lets it leap clear out of the water to snatch flying insects from just above the surface, a hunting technique unusual among small minnows.
Which of these two fish is more at risk, the central stoneroller or the redside dace?
The redside dace is considerably more at risk, classified as Near Threatened after declining significantly in parts of its range, particularly in Canada, due to agricultural runoff and other degradation of the cold headwater streams it depends on, while the central stoneroller remains one of the most widespread and locally abundant fish across its range.
How do breeding males of these two species look different?
A breeding male central stoneroller develops a crown of large, sharp tubercles across the top of its head, used to battle rivals for spawning territory, while a breeding redside dace instead displays a vivid red-orange stripe along the side of its body, a colour signal rather than a physical weapon.