RiverFish

Bleak · Alburnus alburnus

Bleak in the River Old Windsor - Bell

Largest measured bleak: 19.6 cm

The largest bleak measured in Environment Agency surveys of the River Old Windsor - Bell was 19.6 cm, recorded at Old Windsor, Weir Pool on 5 September 2003.

Across 4,097 measured bleak, the median measured length was 8.1 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 Old Windsor - Bell.

See bleak records across England →

Most recent observation29 August 2025Ham Loop · 137 fish
Largest measured bleak
19.6 cm
Median length
8.1 cm
Fish measured
4,097
Survey locations
5

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
19.6 cm5 Sept 2003Old Windsor, Weir Pool77771
19.1 cm5 Sept 2003Old Windsor, Weir Pool77771
17.2 cm7 Sept 2005Ham Loop86738
14.6 cm10 Sept 2004Ham Loop82343
14.6 cm10 Sept 2004Ham Loop82343
14.5 cm10 Sept 2009Old Windsor Main Channel119014
14.4 cm10 Sept 2004Ham Loop82343
14.4 cm10 Sept 2004Ham Loop82343
14.3 cm10 Sept 2004Ham Loop82343
14.2 cm10 Sept 2004Ham Loop82343

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
Ham Loop1 Sept 199529 Aug 202523
Old Windsor Main Channel13 Sept 20025 Sept 20137
Old Windsor, Weir Pool1 Sept 19957 Sept 20076
Upper Old Windsor Main Channel7 Sept 20057 Sept 20051
Lower Old Windsor Main Channel7 Sept 20057 Sept 20051

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

1995–2025

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 4,097 measured fish were spread across different length ranges.

Smallest
1 cm
Lower quarter
7.2 cm
Median
8.1 cm
Upper quarter
9.3 cm
Largest
19.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Old Windsor - Bell

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

Roach Perch Pike European eel Chub Dace

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 →