RiverFish

Bleak · Alburnus alburnus

Bleak in the River Uck

Largest measured bleak: 6.5 cm

The largest bleak measured in Environment Agency surveys of the River Uck was 6.5 cm, recorded at Uckfield on 14 August 2025.

Across 39 measured bleak, the median measured length was 4.3 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Uck.

See bleak records across England →

Most recent observation14 August 2025Uckfield · 22 fish
Largest measured bleak
6.5 cm
Median length
4.3 cm
Fish measured
39
Survey locations
3

Individual EA measurements

Largest measured bleak

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
6.5 cm14 Aug 2025Uckfield177952
5.3 cm1 Aug 2024Uckfield166436
5 cm14 Aug 2025Uckfield177952
5 cm7 Aug 2025Isfield Weir177813
4.8 cm14 Aug 2025Uckfield177952
4.8 cm7 Aug 2025Stroodland Wood177812
4.7 cm14 Aug 2025Uckfield177952
4.7 cm7 Aug 2025Isfield Weir177813
4.7 cm7 Aug 2025Stroodland Wood177812
4.6 cm7 Aug 2025Isfield Weir177813

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where bleak were found

Each point marks a survey location with at least one bleak record.

Choose a point on the map to see what was recorded there.

Map points are approximate and don’t show fishing access. Check local permissions before visiting.

Place surveyedFirst recordedLast recordedVisits finding bleak
Uckfield1 Aug 202414 Aug 20252
Stroodland Wood7 Aug 20257 Aug 20251
Isfield Weir7 Aug 20257 Aug 20251

Choose a point or table row to see the location. More survey visits can mean more records, but not necessarily more fish.

2024–2025

Survey records by year

Each bar shows how many survey visits recorded bleak that year.

Fish measured by surveyors

Measured length distribution

See how the 39 measured fish were spread across different length ranges.

Smallest
1.5 cm
Lower quarter
3.5 cm
Median
4.3 cm
Upper quarter
4.6 cm
Largest
6.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Uck

Compare other species with enough survey and measurement data for a detailed page.

Stone loach Minnow Roach Bullhead Gudgeon Chub

Before you fish

Good to know

These are past survey records, so the fish present today may be different. Map points are approximate—check local access, permissions and fishing rules before visiting.

Learn how RiverFish uses the data →