RiverFish

Bleak · Alburnus alburnus

Bleak in the Boulters Weir Stream

Largest measured bleak: 10.9 cm

The largest bleak measured in Environment Agency surveys of the Boulters Weir Stream was 10.9 cm, recorded at Boulters Weir Downstream Fry on 31 August 2006.

Across 390 measured bleak, the median measured length was 6.3 cm.

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

See bleak records across England →

Most recent observation4 September 2025Boulters Weir Upstream Fry · 4 fish
Largest measured bleak
10.9 cm
Median length
6.3 cm
Fish measured
390
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.

LengthSurvey dateSurvey locationSurvey ID
10.9 cm31 Aug 2006Boulters Weir Downstream Fry111832
10.8 cm26 Aug 2003Boulters Weir Upstream Fry116939
10.7 cm26 Aug 2003Boulters Weir Upstream Fry116939
10.3 cm19 Aug 2014Boulters Weir Downstream Fry142435
10.3 cm20 Aug 2012Boulters Weir Upstream Fry135281
10.1 cm21 Aug 2007Boulters Weir Upstream Fry108593
10 cm21 Aug 2007Boulters Weir Upstream Fry108593
9.9 cm31 Aug 2006Boulters Weir Downstream Fry111832
9.8 cm21 Aug 2007Boulters Weir Upstream Fry108593
9.7 cm21 Aug 2007Boulters Weir Upstream Fry108593

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
Boulters Weir Upstream Fry26 Aug 20034 Sept 202513
Boulters Weir Downstream Fry7 Sept 20044 Sept 20259

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

2003–2025

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 390 measured fish were spread across different length ranges.

Smallest
1.4 cm
Lower quarter
4.3 cm
Median
6.4 cm
Upper quarter
7.4 cm
Largest
10.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Boulters Weir Stream

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

Minnow Dace Roach Chub Gudgeon Bullhead

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 →