Bleak · Alburnus alburnus

Bleak in the River Eden

Largest measured bleak: 22.4 cm

The largest bleak measured in Environment Agency surveys of the River Eden was 22.4 cm, recorded at Delaware Farm on 9 September 2004.

Across 2,049 measured bleak, the median measured length was 8.1 cm.

Surveyors recorded weights for 191 bleak. The median was 0.2 oz (0.006 kg) and the largest recorded weight was 1.3 oz (0.038 kg).

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

See bleak records across England →

Most recent observation12 June 2025Delaware Farm · 248 fish

Largest measured bleak: 22.4 cm
Median length: 8.1 cm
Fish measured: 2,049
Survey locations: 5

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
22.4 cm	9 Sept 2004	Delaware Farm	82768
20 cm	8 Sept 2005	u/s Vexour Bridge	87600
19.1 cm	24 Jul 2003	Delaware Farm	77824
17.5 cm	20 Jun 2013	Delaware Farm	136565
16.3 cm	7 Jul 2010	Delaware Farm	122682
16 cm	20 Jun 2013	Delaware Farm	136565
16 cm	1 Sept 2006	u/s Vexour Bridge	103364
15.5 cm	20 Jun 2013	Delaware Farm	136565
15.3 cm	29 Nov 2001	u/s Vexour Bridge	22523
15.1 cm	30 Jul 2002	u/s Bough Beech Intake	66382

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
Delaware Farm	24 Jul 2003	12 Jun 2025	10
u/s Bough Beech Intake	20 Dec 2001	4 Jun 2025	13
u/s Vexour Bridge	29 Nov 2001	3 Jun 2025	14
Cernes Farm	12 Jul 2006	12 Jul 2006	1
d/s Bough Beech Intake	24 Jul 2002	24 Jul 2002	1

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

2001–2025

Survey records by year

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

201

302

303

304

205

206

307

308

309

310

011

012

313

014

015

316

017

018

319

020

021

022

023

024

325

Fish measured by surveyors

Measured length distribution

See how the 2,049 measured fish were spread across different length ranges.

Smallest: 2 cm
Lower quarter: 6.7 cm
Median: 8.1 cm
Upper quarter: 9.6 cm
Largest: 22.4 cm

0–99 mm

1608

100–199 mm

439

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 191 bleak. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.1 oz (0.004 kg)
Median: 0.2 oz (0.006 kg)
Upper quarter: 0.4 oz (0.01 kg)
Heaviest: 1.3 oz (0.038 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Eden

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

Roach Chub Gudgeon Minnow Stone loach Perch

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 →