Bleak
Bleak are a native Dutch silverfish found in rivers, canals, and waterways across the country. Small and fast-biting, they're a staple of match and pole fishing — the kind of fish that keeps your net filling when bigger species aren't cooperating.
Fly anglers also target them on tiny dry flies, making them a surprisingly sporting quarry on ultralight gear.
Scientific Name: Alburnus alburnus
Also known as Blei, Alver, Common Bleak, European Bleak
- Slim, laterally compressed body with intensely silver flanks and a blue-green to grey back — scales are large, loosely attached, and fall off at a touch.
- Upturned mouth sits at the tip of the snout, a clear sign this fish feeds at or near the surface.
- Notably long anal fin distinguishes it from young roach, which share similar size and silver coloring.
- Most fish run 10–15 cm; specimens reaching 20–25 cm are considered large for the species.
What to know
Habitat Distribution
- Native to the Netherlands and widespread in larger rivers, canals, and waterways — the Eem, Rhine system, and the polder canal networks all hold good populations.
- Strongly associated with flowing or at least moving water; far less common in still, isolated ponds or lakes with no connection to river systems.
- A pelagic, open-water shoaling fish — it lives in the upper water column rather than hugging the bottom or heavy structure.
- Tolerates slightly brackish conditions, which allows it to persist in tidal reaches of larger Dutch river systems.
Key Locations
- Eem River (near Utrecht) — a productive mixed-species river where bleak feature alongside roach and bream in match catches.
- Polder canal networks across the western Netherlands — the interconnected waterways hold year-round bleak populations accessible from the bank.
- Larger river systems (Rhine, Maas, IJssel) — main-river canals and side channels connected to these catchments consistently hold shoals.
Specific Spots
- Bridges, jetties, and lock gates create current breaks and shade — bleak shoals stack up in these spots, especially in moderate flow.
- Fish the top 30–60 cm of the water column; bleak feed at the surface and rarely drop deep except during bright midday sun.
- On canals, the slack water just inside a bend or alongside moored boats concentrates shoals and keeps them within easy reach of a pole or float rod.
- In rivers, look for the seam between faster and slower current — bleak hold on the slower side and intercept food washing past.
Bleak FAQ
Answers from onWater's species guide.
What are the best lures and bait for Bleak?
Single white maggot on a size 20–22 hook is the most reliable hookbait year-round; pinkie (small maggot) works when fish are finicky. Bloodworm on a fine-wire hook is highly effective in spring and early summer, particularly when the water is cool and surface activity is limited.
What flies work for Bleak?
Small dry flies in sizes 18–22 are the main approach, patterns imitating midges or small surface insects (CDC Midge, Griffith's Gnat) match what bleak are actually eating at the surface.
When is the best time to fish for Bleak?
Spring (April–May), fish become active as water warms; spawning activity concentrates them in shallow margins. Summer (June–August), peak season; shoals are large, surface feeding is consistent, and both float and fly tactics produce well.
How do you catch Bleak?
Most Dutch anglers fish bleak from the bank with a pole or light float rod, feeding small amounts of loose maggots regularly to hold the shoal in the swim and fishing a single maggot or pinkie just 30–60 cm deep.
What do Bleak eat?
Primarily surface and mid-water insects, fallen terrestrials, emerging midges, and floating plankton make up the bulk of their diet, which is why small dry flies and single maggots on a shallow rig both work so well.
See it in the app
Most maps show you water.
onWater shows you Bleak.
- 01 · Species map filter
Map every Bleak water
Pick Bleak and the map zeroes in on the waters they call home. No more guessing which lake holds them.
- 02 · Waterbody species
Tap any water. See what lives there.
Species, behavior and seasonal patterns for every lake, river and pond, before you leave the driveway.
- 03 · Angler Intelligence
Ask how to catch Bleak
Tactics, gear and timing from onWater's AI fishing guide, tuned to the species and the water you're on.
Stop guessing where Bleak are.
Open the map, filter by Bleak, and head to water that holds them. Download onWater and plan your next trip in minutes.
- Species map filter
- Angler Intelligence
- Fishing journal
Explore other species
Trout, bass, salmon, panfish and everything in between. Each guide unpacks the behavior, seasons, and tactics that put fish in the net.
No species information available.
Smarter Fishing Starts in the App.
onWater Fish gives you everything you need to plan smarter, fish better, and own every trip from first cast to last.