Bleak Identification Guide
How to recognize a Bleak by its slim silvery body, upturned mouth, and scaleless belly keel.
Read the full Bleak encyclopedia entry →
Key identification features
- Small, highly compressed, slender silvery fish, rarely exceeding 15 cm
- Sharply upturned mouth with a protruding lower jaw, adapted for surface feeding
- Large eyes relative to head size
- Deeply forked tail fin
- Thin, scaleless keel running along the belly (a key diagnostic point)
- Iridescent blue-green sheen along the back
Common look-alikes
- Common Dace: deeper-bodied, with a less upturned mouth and no scaleless belly keel
- Juvenile Roach: rounder, deeper body shape and duller, less flashy silver coloration
- Silver Bream: much deeper and flatter-bodied, lacking the bleak's slim, torpedo-like profile
Where you'll see one
Bleak inhabit slow to moderately flowing rivers, canals, and lakes across much of Europe, typically shoaling in large numbers near the surface where they feed on drifting insects and plankton. They are most easily spotted rippling the surface in open water on calm days, often in the company of other small cyprinids, and dense schools can sometimes cover a wide area of open water in summer.
Frequently asked questions
How do I tell a bleak from a small dace?
Feel and look at the belly: bleak have a thin, scaleless keel running along the underside that dace lack, and bleak's mouth is more sharply upturned for surface feeding.
Why does a bleak look silvery and flashy?
Its body is strongly laterally compressed with large, reflective scales, which combined with shoaling near the surface produces the bright, flickering silver appearance typical of the species.
Bleak identified by the community
Recent Bleak catches identified with Fish Identifier.
