RiverFish

Bleak · Alburnus alburnus

Bleak in the River Molesey - Teddington

Largest measured bleak: 15.7 cm

The largest bleak measured in Environment Agency surveys of the River Molesey - Teddington was 15.7 cm, recorded at Molesey Weir Pool on 15 September 2006.

Across 911 measured bleak, the median measured length was 9 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 Molesey - Teddington.

See bleak records across England →

Most recent observation31 July 2025Molesey - Thames Ditton Island, Upper Main Channel · 27 fish
Largest measured bleak
15.7 cm
Median length
9 cm
Fish measured
911
Survey locations
4

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
15.7 cm15 Sept 2006Molesey Weir Pool101378
15.6 cm10 Sept 2003Molesey Weir Pool78491
15.2 cm10 Sept 2003Molesey Weir Pool78491
14.1 cm14 Sept 2005Molesey Weir Pool86284
14 cm15 Sept 2006Molesey Weir Pool101378
13.9 cm10 Sept 2003Molesey Back Weir79188
13.8 cm10 Sept 2003Molesey Back Weir79188
13.4 cm10 Sept 2003Molesey - Thames Ditton Island, Upper Main Channel77780
13.3 cm10 Sept 2003Molesey Back Weir79188
13.3 cm10 Sept 2003Molesey Back Weir79188

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
Molesey Weir Pool1 Sept 199531 Jul 202521
Molesey - Thames Ditton Island, Upper Main Channel1 Sept 200031 Jul 202514
Surbiton Intake to Kingston1 Sept 200016 Sept 20092
Molesey Back Weir10 Sept 200310 Sept 20031

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 911 measured fish were spread across different length ranges.

Smallest
1.9 cm
Lower quarter
8.2 cm
Median
9 cm
Upper quarter
9.8 cm
Largest
15.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Molesey - Teddington

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

Roach Perch Chub Pike Dace 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 →