RiverFish

Bleak · Alburnus alburnus

Bleak in the River Derwent (Yorkshire)

Largest measured bleak: 16.4 cm

The largest bleak measured in Environment Agency surveys of the River Derwent (Yorkshire) was 16.4 cm, recorded at Sutton Upon Derwent DERCORS18 on 16 September 2004.

Across 373 measured bleak, the median measured length was 9.1 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 (Yorkshire).

See bleak records across England →

Most recent observation19 August 2024Bubwith - Fry Survey · 1 fish
Largest measured bleak
16.4 cm
Median length
9.1 cm
Fish measured
373
Survey locations
9

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
16.4 cm16 Sept 2004Sutton Upon Derwent DERCORS1884316
15.4 cm21 Jul 2015Sutton Upon Derwent DERCORS18145548
15.4 cm21 Sept 2006Stamford Bridge DERCORS10107944
15.3 cm12 Sept 2007Sutton Upon Derwent DERCORS18108113
15.2 cm9 Sept 2002Sutton Upon Derwent DERCORS1872285
15.1 cm26 Jul 2012Sutton Upon Derwent DERCORS18132612
15 cm9 Sept 2002Sutton Upon Derwent DERCORS1872285
14.8 cm27 Jul 2012Stamford Bridge DERCORS10132630
14.8 cm12 Sept 2007Sutton Upon Derwent DERCORS18108113
14.7 cm12 Sept 2007Sutton Upon Derwent DERCORS18108113

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
Bubwith - Fry Survey21 Sept 199219 Aug 202412
Sutton Upon Derwent DERCORS1826 Sept 199730 Jul 202413
Stamford Bridge DERCORS1024 Apr 199529 Jul 202413
Kirkham Abbey DERCORS729 Aug 200316 Jul 20183
Buttercrambe DERCORS928 Jun 201828 Jun 20181
Wheldrake Ings DERCORS1917 Sept 200119 Oct 20088
Howsham DERCORS825 Sept 200625 Sept 20061
Barmby on the Marsh DERCORS2123 Sept 199711 Sept 20033
Breighton DERCORS2025 Apr 199510 Sept 20033

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

1992–2024

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 373 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
7.1 cm
Median
9.1 cm
Upper quarter
11.1 cm
Largest
16.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent (Yorkshire)

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

Minnow Bullhead Stone loach Dace European eel 3-spined stickleback

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 →