RiverFish

Bleak · Alburnus alburnus

Bleak in the River Derwent

Largest measured bleak: 16.6 cm

The largest bleak measured in Environment Agency surveys of the River Derwent was 16.6 cm, recorded at Church Wilne on 12 September 2004.

Across 749 measured bleak, the median measured length was 11.5 cm.

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

See bleak records across England →

Most recent observation19 September 2025Nooning Lane Net · 1 fish
Largest measured bleak
16.6 cm
Median length
11.5 cm
Fish measured
749
Survey locations
6

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
16.6 cm12 Sept 2004Church Wilne82128
16.5 cm12 Sept 2004Church Wilne82128
16.2 cm12 Sept 2004Church Wilne82128
16.2 cm12 Sept 2004Church Wilne82128
15.9 cm11 Sept 2005Church Wilne87969
15.8 cm9 Sept 2007Church Wilne107968
15.6 cm2 Sept 2007Borrowash107983
15.6 cm9 Sept 2001Church Wilne25528
15.3 cm11 Sept 2005Church Wilne87969
15.1 cm12 Sept 2004Church Wilne82128

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
Nooning Lane Net29 Sept 201019 Sept 20254
Chub Alley1 Jul 201017 Sept 20142
Borrowash14 Oct 20011 Sept 20137
Chub Alley Net29 Sept 20103 Aug 20122
Church Wilne28 Apr 19935 Oct 20088
Nooning Lane19 Apr 200519 Apr 20051

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

1993–2025

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 749 measured fish were spread across different length ranges.

Smallest
2.3 cm
Lower quarter
10.6 cm
Median
11.5 cm
Upper quarter
12.4 cm
Largest
16.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent

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

Brown / sea trout Bullhead Minnow Grayling Chub 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 →