RiverFish

Bleak · Alburnus alburnus

Bleak in the Lee Navigation

Largest measured bleak: 16.5 cm

The largest bleak measured in Environment Agency surveys of the Lee Navigation was 16.5 cm, recorded at Picketts Lock on 3 September 2004.

Across 1,245 measured bleak, the median measured length was 9.4 cm.

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

See bleak records across England →

Most recent observation16 September 2025Upstream Carthagena Lock · 17 fish
Largest measured bleak
16.5 cm
Median length
9.4 cm
Fish measured
1,245
Survey locations
19

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
16.5 cm3 Sept 2004Picketts Lock81916
15.3 cm3 Oct 2003Picketts Lock77285
15.2 cm30 Aug 2006Ponders End101066
14.9 cm5 Aug 2025Ponders End177752
14.9 cm10 Nov 1992Kings Meads Fields115987
14.8 cm1 Sept 2004Enfield Lock81935
14.8 cm10 Nov 1992Kings Meads Fields115987
14.7 cm10 Nov 1992Kings Meads Fields115987
14.7 cm10 Nov 1992Kings Meads Fields115987
14.5 cm20 Jul 2010Ponders End123028

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
Upstream Carthagena Lock16 Sept 202516 Sept 20251
Ponders End29 Nov 19785 Aug 202513
Picketts Lock3 Oct 200310 Jul 202511
Hertford Basin24 Sept 20032 Aug 20238
Dobbs Weir8 Jul 201322 Jun 20152
Rye House26 Apr 197830 Mar 20122
Enfield Lock22 Oct 200227 Jul 20119
Rye House to Fieldes Weir30 Jun 201130 Jun 20111
Fieldes Weir to Dobbs Weir lock30 Jun 201130 Jun 20111
Stanstead Lock to Hardmead Lock29 Jun 201129 Jun 20111
Rye House to Stanstead Lock29 Jun 201129 Jun 20111
Hardmead Lock to Ware Lock29 Jun 201129 Jun 20111
Enfield Lock (OAP Fishing Match)1 Aug 20074 Aug 20104
Ware Priory7 Oct 20047 Oct 20041
Kings Meads Fields10 Nov 199210 Nov 19921
Marshgate Drive (Dicker Mill Stream)17 Sept 199217 Sept 19921
New Gauge4 Jul 19784 Jul 19781
Fieldes Weir to Dobbs Weir19 Apr 197819 Apr 19781
Stanstead Lock Upstream5 Apr 19785 Apr 19781

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

1978–2025

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 1,245 measured fish were spread across different length ranges.

Smallest
2.6 cm
Lower quarter
8.3 cm
Median
9.4 cm
Upper quarter
10.9 cm
Largest
16.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Lee Navigation

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

Roach Perch Pike Chub Tench Common bream

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 →