RiverFish

Bleak · Alburnus alburnus

Bleak in the River Middle Ouse

Largest measured bleak: 14.8 cm

The largest bleak measured in Environment Agency surveys of the River Middle Ouse was 14.8 cm, recorded at US Dolphin Meadow on 8 October 2001.

Across 5,353 measured bleak, the median measured length was 10.3 cm.

Surveyors recorded one individual weight: 0.1 oz (0.003 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 Middle Ouse.

See bleak records across England →

Most recent observation15 October 2025Portholme Meadow · 4 fish
Largest measured bleak
14.8 cm
Median length
10.3 cm
Fish measured
5,353
Survey locations
40

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
14.8 cm8 Oct 2001US Dolphin Meadow30837
14.8 cm8 Oct 2001US Dolphin Meadow30837
14.8 cm26 Aug 1998DS Barford Power Station29153
14.8 cm26 Aug 1998DS Barford Power Station29153
14.8 cm2 Oct 1989Castle Hills Huntingdon29165
14.8 cm31 Jul 1989Cardington Navigation29107
14.6 cm24 Sept 2013US Dolphin Meadow138886
14.3 cm8 Oct 2001US Dolphin Meadow30837
14.3 cm21 Sept 2001Longholme30831
14.3 cm21 Sept 2001Longholme30831

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
Portholme Meadow27 Sept 198915 Oct 202516
US Dolphin Meadow24 Oct 19892 Oct 201912
Houghton4 Oct 19891 Oct 20194
St Neots Common14 Aug 19895 Oct 20186
Eynesbury19 Aug 20153 Oct 20182
Kelpie Marina8 Aug 19892 Oct 20187
Holywell14 Aug 199226 Sept 201610
Offord Triangle17 Jul 199221 Aug 20155
Longholme24 Jul 198917 Aug 20156
Pike & Eel8 Sept 199227 Sept 201311
Hartford Church29 Sept 198920 Aug 20108
Renhold2 Aug 198924 Sept 20085
Little Paxton18 Aug 19891 Sept 20085
Brownshill Pumping Station (Eel Monitoring)2 May 20072 May 20071
Hermitage Lock Drain (Eel Monitoring)25 Apr 200725 Apr 20071
Little Paxton Nature Reserve4 Sept 19891 Dec 20063
Dolphin Meadow25 Oct 19892 Sept 20034
Hemingford Grey23 Oct 198928 Aug 20034
Castle Hills Huntingdon2 Oct 198926 Aug 20034
Mow Fen9 Sept 19924 Aug 20034
Brampton25 Sept 19893 Oct 20013
Barford Bridge3 Aug 19891 Oct 20014
Earith17 Aug 199917 Aug 19991
Bluntisham2 Oct 19956 Aug 19992
Meadow Lane St Ives29 Oct 19903 Aug 19994
St Ives26 Oct 19892 Aug 19994
Hemingford Abbots5 Oct 198926 Jul 19993
Houghton Lock3 Oct 198919 Jul 19993
Hartford12 Oct 198913 Jul 19993
Portholme Lock28 Sept 19899 Jul 19993
Offord Intake15 Jul 199214 Sept 19982
Riverside Park11 Aug 19892 Sept 19983
DS Barford Power Station11 Aug 198926 Aug 19983
Barford Power Station9 Aug 198925 Aug 19983
Wyboston Lakes7 Aug 198924 Aug 19983
Blunham4 Aug 198913 Aug 19983
Willington1 Aug 198911 Aug 19983
Cardington Navigation31 Jul 19895 Aug 19983
Buckden Marina15 Sept 198916 Jul 19922
DS Samual Jones17 Aug 19893 Jul 19922

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

1989–2025

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 5,353 measured fish were spread across different length ranges.

Smallest
3.5 cm
Lower quarter
9.8 cm
Median
10.3 cm
Upper quarter
11.3 cm
Largest
14.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

One individual weight was recorded for this fish and river. This is a subset of the measured fish and may not represent the whole population.

Recorded weight
0.1 oz (0.003 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 Middle Ouse

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

Perch Roach Pike Gudgeon Common bream Dace

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 →