RiverFish

Bleak · Alburnus alburnus

Bleak in the River Thame

Largest measured bleak: 15.5 cm

The largest bleak measured in Environment Agency surveys of the River Thame was 15.5 cm, recorded at Waterstock Mill on 20 September 2004.

Across 2,205 measured bleak, the median measured length was 8.2 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 Thame.

See bleak records across England →

Most recent observation17 September 2025Dorchester Road Bridge · 46 fish
Largest measured bleak
15.5 cm
Median length
8.2 cm
Fish measured
2,205
Survey locations
19

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
15.5 cm20 Sept 2004Waterstock Mill82524
14.1 cm20 Sept 2004Waterstock Mill82524
14 cm28 Sept 2010Old Crendon Road Bridge124916
13.9 cm8 Sept 2009Eythrope120321
13.8 cm8 Sept 2009Eythrope120321
13.7 cm11 Sept 2025Ickford Bridge178507
13.5 cm2 Sept 2009Ickford Bridge120325
13.4 cm3 Sept 2009Cuddesdon120329
13.3 cm23 Sept 2008Ickford Bridge114966
13.3 cm15 Jul 2008Eythrope_ByPass Channel Site Two112007

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
Dorchester Road Bridge14 Oct 200317 Sept 20258
Chiselhampton18 Sept 200317 Sept 202512
Waterstock Mill20 Sept 200416 Sept 202511
Cuddesdon19 Sept 200316 Sept 202512
Ickford Bridge3 Sept 200311 Sept 202513
Old Crendon Road Bridge13 Sept 20069 Sept 20256
Nether Winchendon - Lower Riffle5 Aug 200228 Aug 202510
Upstream of Notley Abbey20 Aug 200216 Sept 202212
Downstream Eythrope16 Aug 201613 Sept 20223
Shabbington (West Arm)20 Aug 200221 Aug 201912
Eythrope_Historic Channel Site Three14 Jul 200829 Jul 20133
Eythrope_Riffles Site Two16 Jul 20089 Jul 20102
Eythrope_ByPass Channel Site Two15 Jul 20088 Jul 20102
Eythrope8 Sept 20098 Sept 20091
Eythrope_Riffles Site Three17 Jul 200817 Jul 20081
Eythrope_Riffles Site One16 Jul 200816 Jul 20081
Eythrope_Historic Channel Site Two14 Jul 200814 Jul 20081
Eythrope_Historic Channel Site One14 Jul 200814 Jul 20081
D/s Bear Brook26 Sept 200626 Sept 20061

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

2002–2025

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 2,205 measured fish were spread across different length ranges.

Smallest
2.5 cm
Lower quarter
6.3 cm
Median
8.2 cm
Upper quarter
9.8 cm
Largest
15.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thame

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

Chub Roach Gudgeon Dace Perch Pike

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 →