Bleak · Alburnus alburnus

Bleak in the Datchet Common Brook

Largest measured bleak: 14.2 cm

The largest bleak measured in Environment Agency surveys of the Datchet Common Brook was 14.2 cm, recorded at Swan Sanctuary on 29 January 2020.

Across 112 measured bleak, the median measured length was 9.2 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Datchet Common Brook.

See bleak records across England →

Most recent observation29 January 2020Swan Sanctuary · 98 fish

Largest measured bleak: 14.2 cm
Median length: 9.2 cm
Fish measured: 112
Survey locations: 3

Individual EA measurements

Largest measured bleak

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

Length	Survey date	Survey location	Survey ID
14.2 cm	29 Jan 2020	Swan Sanctuary	156108
13.5 cm	29 Jan 2020	Swan Sanctuary	156108
13 cm	29 Jan 2020	Swan Sanctuary	156108
12.9 cm	29 Jan 2020	Swan Sanctuary	156108
12.8 cm	29 Jan 2020	Swan Sanctuary	156108
12.5 cm	29 Jan 2020	Swan Sanctuary	156108
12.4 cm	29 Jan 2020	Swan Sanctuary	156108
12.3 cm	29 Jan 2020	Swan Sanctuary	156108
12.3 cm	29 Jan 2020	Swan Sanctuary	156108
12.3 cm	29 Jan 2020	Swan Sanctuary	156108

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 surveyed	First recorded	Last recorded	Visits finding bleak
Swan Sanctuary	29 Jan 2020	29 Jan 2020	1
Liquid Leisure Upstream	29 Jan 2020	29 Jan 2020	1
Ditton park	28 Jan 2020	28 Jan 2020	1

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

2020–2020

Survey records by year

Each bar shows how many survey visits recorded bleak that year.

320

Fish measured by surveyors

Measured length distribution

See how the 112 measured fish were spread across different length ranges.

Smallest: 3.4 cm
Lower quarter: 7.8 cm
Median: 9.3 cm
Upper quarter: 11.2 cm
Largest: 14.2 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Datchet Common Brook

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

Perch Chub Gudgeon Roach

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 →