RiverFish

Bleak · Alburnus alburnus

Bleak in the River Desborough Island

Largest measured bleak: 13.4 cm

The largest bleak measured in Environment Agency surveys of the River Desborough Island was 13.4 cm, recorded at Desborough Island 10C on 22 August 2007.

Across 180 measured bleak, the median measured length was 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 River Desborough Island.

See bleak records across England →

Most recent observation3 September 2025Desborough Island Upstream Fry · 30 fish
Largest measured bleak
13.4 cm
Median length
3 cm
Fish measured
180
Survey locations
3

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
13.4 cm22 Aug 2007Desborough Island 10C108636
11.1 cm22 Aug 2006Desborough Island Upstream Fry111973
10.8 cm22 Aug 2007Desborough Island 10C108636
10.4 cm22 Aug 2007Desborough Island 10C108636
8.4 cm30 Aug 2023Desborough Island Upstream Fry164290
8 cm30 Aug 2023Desborough Island Downstream Fry164291
7.5 cm26 Aug 2016Desborough Island Downstream Fry149240
6.7 cm3 Sept 2025Desborough Island Downstream Fry178515
6.3 cm22 Aug 2006Desborough Island Upstream Fry111973
4.7 cm3 Sept 2025Desborough Island Upstream Fry178516

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
Desborough Island Upstream Fry22 Aug 20063 Sept 20258
Desborough Island Downstream Fry22 Sept 20063 Sept 20258
Desborough Island 10C22 Aug 200722 Aug 20071

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

2006–2025

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 180 measured fish were spread across different length ranges.

Smallest
1.6 cm
Lower quarter
2.5 cm
Median
3 cm
Upper quarter
3.6 cm
Largest
13.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Desborough Island

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

Roach Perch Dace Chub Ruffe Gudgeon

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 →