RiverFish

Bleak · Alburnus alburnus

Bleak in the River Mole

Largest measured bleak: 14.9 cm

The largest bleak measured in Environment Agency surveys of the River Mole was 14.9 cm, recorded at Old Mole Channel on 17 October 2012.

Across 220 measured bleak, the median measured length was 10.6 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 Mole.

See bleak records across England →

Most recent observation3 July 2025Downstream Painshill · 4 fish
Largest measured bleak
14.9 cm
Median length
10.6 cm
Fish measured
220
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
14.9 cm17 Oct 2012Old Mole Channel134330
14.9 cm17 Oct 2012Old Mole Channel134330
14.7 cm17 Oct 2012Old Mole Channel134330
14.4 cm17 Oct 2012Old Mole Channel134330
14.4 cm17 Oct 2012Old Mole Channel134330
14 cm17 Oct 2012Old Mole Channel134330
14 cm17 Oct 2012Old Mole Channel134330
13.7 cm6 Oct 2009Downstream Painshill119637
13.6 cm17 Oct 2012Old Mole Channel134330
13.2 cm17 Oct 2012Old Mole Channel134330

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
Downstream Painshill23 Oct 20073 Jul 20254
Old Mole Channel13 Oct 200917 Oct 20122
Garsons Farm11 Mar 199311 Mar 19931
Below Downside Bridge, Cobham.14 Nov 198514 Nov 19851

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

1985–2025

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 220 measured fish were spread across different length ranges.

Smallest
3.4 cm
Lower quarter
8.5 cm
Median
10.6 cm
Upper quarter
11.7 cm
Largest
14.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mole

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

Roach Dace Chub Gudgeon Minnow Stone loach

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 →