RiverFish

Bleak · Alburnus alburnus

Bleak in the River Upper Ouse

Largest measured bleak: 16.3 cm

The largest bleak measured in Environment Agency surveys of the River Upper Ouse was 16.3 cm, recorded at Ravenstone Mill on 18 October 1991.

Across 5,682 measured bleak, the median measured length was 9.8 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 Upper Ouse.

See bleak records across England →

Most recent observation17 June 2025Manor Farm Cosgrove · 6 fish
Largest measured bleak
16.3 cm
Median length
9.8 cm
Fish measured
5,682
Survey locations
29

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
16.3 cm18 Oct 1991Ravenstone Mill28899
15.8 cm26 Sept 1994Newport Pagnell28918
15.8 cm13 Oct 1988Lavendon Mill28884
15.3 cm31 Oct 2016Manor Farm Cosgrove149980
15.3 cm5 Sept 2001Mill Farm Gayhurst30807
15.3 cm30 Oct 1997Ravenstone Mill28939
15.3 cm26 Sept 1994Newport Pagnell28918
15.3 cm13 Oct 1988Lavendon Mill28884
15.3 cm2 Aug 1988Mill Farm Gayhurst28828
14.8 cm5 Sept 2001Mill Farm Gayhurst30807

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
Manor Farm Cosgrove3 May 199417 Jun 20253
Kempston Mill6 Mar 199231 Aug 20236
Oakley11 Mar 199230 Aug 202315
Odell18 Oct 199423 Aug 202310
Turvey31 Oct 199122 Aug 202314
Clifton Reynes22 Oct 199116 Aug 202312
Mill Farm Gayhurst2 Aug 198819 Aug 201911
DS Wolverton Mill14 Aug 201914 Aug 20191
Newport Pagnell15 Nov 19884 Sept 201715
DS Ravenstone Mill1 Sept 20118 Sept 20142
Lavendon Mill13 Oct 19882 Sept 20115
Pavenham20 Oct 199417 Aug 20106
Ravenstone Mill1 Nov 19885 Aug 20109
Radwell / Bletsoe20 Oct 19884 Aug 201013
Wolverton Mill21 Jul 200629 Jun 20102
Passenham18 May 200424 May 20072
Milton Ernest STW7 Sept 20047 Sept 20041
Falcon Inn Bletsoe6 Sept 20046 Sept 20041
Stoke Mill Sharnbrook3 Sept 20043 Sept 20041
Queens Park Bedford5 Nov 19975 Nov 19971
Sherrington26 Oct 198823 Oct 19974
Felmersham19 Oct 198820 Oct 19974
Carlton18 Oct 198817 Oct 19972
Emberton Park10 Oct 199416 Oct 19972
Newton Blossomville17 Oct 19888 Oct 19973
Clapham28 Oct 199428 Oct 19941
Milton Ernest12 Mar 199219 Oct 19942
Harrold Country Park8 Nov 199117 Oct 19942
Biddenham5 Mar 19925 Mar 19921

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

1988–2025

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 5,682 measured fish were spread across different length ranges.

Smallest
1 cm
Lower quarter
9 cm
Median
9.8 cm
Upper quarter
10.8 cm
Largest
16.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Upper Ouse

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

Pike Perch Dace Roach Chub Gudgeon

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 →