Head to head
Tessellated Darter vs Blackside Darter
A tessellated darter and a blackside darter both wear a broken-up dark pattern that helps them disappear against a streambed, yet the two occupy noticeably different regions and show a real difference in how fussy each one is about water quality.
| Tessellated Darter | Blackside Darter | |
|---|---|---|
| Scientific name | Etheostoma olmstedi | Percina maculata |
| Pattern | Small, tile-like mottled blotches | Larger, squarish blotches in a row |
| Water tolerance | Broad, including brackish water | Narrower, sensitive to sedimentation |
| Range | Atlantic coastal plain | Great Lakes and Mississippi drainage |
| Preferred substrate | Varied, tolerant of slower water | Sand and gravel under moderate current |
| Role as indicator species | Less strict indicator | Useful stream-health indicator |
| Male parental care | Guards eggs under a rock | Guards eggs under a rock |
| Conservation status | Least Concern | Least Concern |
Tessellated Darter vs Blackside Darter: common questions
Which darter is more tolerant of different water conditions?
The tessellated darter is considerably more tolerant, able to handle a broader range of water conditions including slower current and slightly brackish water near river mouths, which is part of why it remains so common across the Atlantic coastal plain, while the blackside darter is more sensitive to sedimentation and prefers more specific moderate-current, sand-and-gravel habitat.
How can you tell a tessellated darter from a blackside darter by pattern alone?
A tessellated darter shows a finer, more tile-like mottled pattern of small dark blotches across its body, while a blackside darter carries a row of larger, more squarish dark blotches specifically along its midline, a bolder and more linear pattern than the tessellated darter's finer mottling.
Do both darters live in the same rivers?
Generally not — the tessellated darter is native to the Atlantic coastal plain of the eastern United States, while the blackside darter occupies the Great Lakes and Mississippi River drainage basins further west and inland, meaning the two species' ranges are largely separate rather than overlapping.