Bleak · Alburnus alburnus

Bleak in the Moretons Leam

Largest measured bleak: 16 cm

The largest bleak measured in Environment Agency surveys of the Moretons Leam was 16 cm, recorded at Stanground on 14 September 1981.

Across 692 measured bleak, the median measured length was 8.5 cm.

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

See bleak records across England →

Most recent observation6 November 2025March Farmers · 1 fish

Largest measured bleak: 16 cm
Median length: 8.5 cm
Fish measured: 692
Survey locations: 7

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
16 cm	14 Sept 1981	Stanground	109046
14 cm	18 May 1995	Rings End	54169
13.7 cm	14 Sept 1981	Stanground	109046
13.5 cm	5 Jun 1989	Little Bridge	54149
13 cm	30 Mar 1999	Rings End	54176
13 cm	30 Mar 1999	Rings End	54176
13 cm	25 Mar 1999	Little Bridge	54172
13 cm	25 Mar 1999	Little Bridge	54172
13 cm	18 May 1995	Rings End	54169
13 cm	11 May 1992	March Farmers	54160

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
March Farmers	8 Jun 1989	6 Nov 2025	6
Stanground	14 Sept 1981	4 Nov 2022	9
Little Bridge	5 Jun 1989	28 May 2013	4
Upstream Eldernell	6 Jun 1989	12 Apr 1999	3
Rings End	14 Apr 1992	30 Mar 1999	3
McCains	13 Jun 1989	26 Mar 1999	3
Upstream Rings End	12 Jun 1989	12 Jun 1989	1

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

1981–2025

Survey records by year

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

181

082

083

184

085

186

087

088

689

090

091

392

093

094

695

096

097

098

699

000

001

002

003

004

105

006

007

008

009

010

011

012

113

014

015

016

017

018

119

020

021

122

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 692 measured fish were spread across different length ranges.

Smallest: 4.4 cm
Lower quarter: 7.5 cm
Median: 8.5 cm
Upper quarter: 10 cm
Largest: 16 cm

0–99 mm

481

100–199 mm

211

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Moretons Leam

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

Roach Perch Pike Common bream Ruffe European eel

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 →