Bleak · Alburnus alburnus

Bleak in the River Bulbourne

Largest measured bleak: 15.5 cm

The largest bleak measured in Environment Agency surveys of the River Bulbourne was 15.5 cm, recorded at Boxmoor u/s on 14 May 2019.

Across 19 measured bleak, the median measured length was 12.3 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 Bulbourne.

See bleak records across England →

Most recent observation14 May 2019Boxmoor u/s · 2 fish

Largest measured bleak: 15.5 cm
Median length: 12.3 cm
Fish measured: 19
Survey locations: 2

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
15.5 cm	14 May 2019	Boxmoor u/s	154504
14.4 cm	24 Apr 2015	Boxmoor u/s	144597
13.7 cm	14 May 2019	Boxmoor u/s	154504
13.7 cm	24 Apr 2015	Boxmoor u/s	144597
12.7 cm	24 Apr 2015	Boxmoor u/s	144597
12.7 cm	24 Apr 2015	Boxmoor u/s	144597
12.7 cm	24 Apr 2015	Boxmoor u/s	144597
12.5 cm	24 Apr 2015	Boxmoor u/s	144597
12.4 cm	24 Apr 2015	Boxmoor u/s	144597
12.3 cm	24 Apr 2015	Boxmoor u/s	144597

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
Boxmoor u/s	24 Apr 2015	14 May 2019	5
Boxmoor d/s	29 Apr 2016	29 Apr 2016	1

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

2015–2019

Survey records by year

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

115

216

017

218

119

Fish measured by surveyors

Measured length distribution

See how the 19 measured fish were spread across different length ranges.

Smallest: 7.4 cm
Lower quarter: 9.9 cm
Median: 12.3 cm
Upper quarter: 12.7 cm
Largest: 15.5 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Bulbourne

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

Perch Chub Roach Dace Pike 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 →