RiverFish

Bleak · Alburnus alburnus

Bleak in the River Don

Largest measured bleak: 23.4 cm

The largest bleak measured in Environment Agency surveys of the River Don was 23.4 cm, recorded at Kilnhurst Bridge on 25 July 2012.

Across 1,240 measured bleak, the median measured length was 10.1 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 Don.

See bleak records across England →

Most recent observation12 August 2025Sprotborough - Fry Survey · 31 fish
Largest measured bleak
23.4 cm
Median length
10.1 cm
Fish measured
1,240
Survey locations
8

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
23.4 cm25 Jul 2012Kilnhurst Bridge133219
16.9 cm23 Jul 2008Kilnhurst Bridge114154
16.7 cm6 Aug 2007Below Sprotborough Weir DON/CO/TEMP/002107934
16.6 cm13 Jul 2016Doncaster (crimpsal) DON/CO/TEMP/003148535
16.6 cm25 Jul 2008Doncaster (crimpsal) DON/CO/TEMP/003114177
16.5 cm23 Jul 2008Kilnhurst Bridge114154
16.5 cm23 Jul 2008Kilnhurst Bridge114154
16.2 cm23 Jul 2008Kilnhurst Bridge114154
16 cm5 Jul 2013Doncaster (crimpsal) DON/CO/TEMP/003136984
16 cm28 Jul 2009Below Sprotborough Weir DON/CO/TEMP/002119128

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
Sprotborough - Fry Survey29 Sept 199712 Aug 20258
Kilnhurst - Fry Survey6 Aug 201812 Aug 20254
Doncaster (crimpsal) DON/CO/TEMP/00311 Jul 20024 Aug 202515
Kilnhurst Bridge30 Jun 200531 Jul 202513
Conisborough17 Sept 200720 Jul 20175
Below Sprotborough Weir DON/CO/TEMP/00226 Jul 20013 Jul 201712
Thorpe Marsh (Tidal)30 Jun 201130 Jun 20111
Hexthorpe15 Jul 200815 Jul 20081

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

1997–2025

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 1,240 measured fish were spread across different length ranges.

Smallest
1.8 cm
Lower quarter
8 cm
Median
10.1 cm
Upper quarter
12.3 cm
Largest
23.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Don

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

3-spined stickleback Brown / sea trout Gudgeon Roach Minnow Perch

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 →