Head to head
Bigeye Shiner vs Telescope Shiner
A bigeye shiner and a telescope shiner are both small minnows whose common names point to the same distinctive trait, unusually large eyes, though each species puts that shared feature to slightly different use.
| Bigeye Shiner | Telescope Shiner | |
|---|---|---|
| Scientific name | Notropis boops | Notropis telescopus |
| Eye function | Low-light foraging | Tracking drifting prey |
| Preferred water | Clear, quiet pools | Clear, moderate current |
| Peak activity | Dawn and dusk | Feeds within the drift |
| Range | Central United States | Upper Tennessee, Cumberland drainages |
| Body pattern | Dark lateral stripe | Faint stripe, large eyes prominent |
| Diet | Insectivore | Insectivore |
| Conservation status | Least Concern | Least Concern |
Bigeye Shiner vs Telescope Shiner: common questions
Why do both the bigeye shiner and telescope shiner have such large eyes?
Both species have evolved noticeably large eyes relative to their head size, but for somewhat different reasons: the bigeye shiner's large eyes are thought to support effective foraging in the dimmer light of dawn and dusk in quiet pools, while the telescope shiner's large, forward-directed eyes are thought to help it visually track fast-moving insect prey drifting past in moving current.
Do the bigeye shiner and telescope shiner live in the same streams?
Their ranges can overlap in parts of the central and southern Appalachian region, but the bigeye shiner has a broader overall range across the central United States, while the telescope shiner is more specifically concentrated within the upper Tennessee and Cumberland River drainages, a narrower distribution than its similarly large-eyed relative.
How can you tell a bigeye shiner from a telescope shiner?
Both are slender, silvery minnows with prominent eyes, but the bigeye shiner shows a more distinct dark lateral stripe along its side, while the telescope shiner's stripe is fainter and its already large eyes tend to appear even more prominent proportionally, subtle differences that are easiest to confirm alongside checking which specific stream drainage the fish was found in.