RiverFish

Bleak · Alburnus alburnus

Bleak in the River Ouse

Largest measured bleak: 103.6 cm

The largest bleak measured in Environment Agency surveys of the River Ouse was 103.6 cm, recorded at Naburn Weir (seine net) on 8 August 1997.

Across 6,458 measured bleak, the median measured length was 7.9 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 Ouse.

See bleak records across England →

Most recent observation22 June 2026Naburn Weir (single anode) · 42 fish
Largest measured bleak
103.6 cm
Median length
7.9 cm
Fish measured
6,458
Survey locations
19

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
103.6 cm8 Aug 1997Naburn Weir (seine net)110358
18.8 cm28 Jul 1998Beningbrough Village (seine net site)106537
16.6 cm21 Jun 2013Linton-on-Ouse, below weir (single anode)136528
16.2 cm20 Jul 2000Acaster Malbis (boom boat site)107512
15.8 cm21 Jun 2018Naburn Weir (single anode)152676
15.8 cm23 Jul 1999Naburn Weir (boom boat site)105760
15.7 cm8 Aug 1997Naburn Weir (boom boat site)110350
15.6 cm15 Jul 2002Acaster Malbis (boom boat site)72799
15.5 cm25 Jul 2007Linton-on-Ouse u/s weir (single anode)106455
15.3 cm20 Jul 2000Acaster Malbis (boom boat site)107512

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
Naburn Weir (single anode)22 Jul 199622 Jun 202624
Naburn - Fry Survey25 Sept 20037 Aug 202512
Linton-on-Ouse, below weir (single anode)25 Jul 19963 Jul 202524
Beningbrough Village (single anode)24 Jul 19962 Jul 202522
Linton-on-Ouse u/s weir (single anode)1 Aug 199730 Jun 202515
Acaster Malbis (single anode)26 Jul 199626 Jun 202519
Acaster - Fry Survey24 Sept 198514 Aug 202315
Beningborough - Fry Survey20 Sept 19841 Sept 200922
Nether Poppleton (single anode)6 Aug 19975 Jul 20058
Acaster Malbis (gill net)20 Jul 199915 Jul 20042
Linton-on-Ouse u/s weir (boom boat)23 Jul 199614 Jul 20035
Linton-on-Ouse u/s (seine netting site)1 Aug 199714 Jul 20037
Beningbrough Village (seine net site)24 Jul 199610 Jul 20038
Beningbrough Village (boom boat site)26 Jul 199610 Jul 20037
Nether Poppleton (boom boat)18 Jul 19969 Jul 20036
Acaster Malbis (boom boat site)7 Aug 19978 Jul 20037
Naburn Weir (boom boat site)22 Jul 19967 Jul 20037
Linton weir - u/s - Fry Survey29 Sept 199829 Sept 19981
Naburn Weir (seine net)22 Jul 199627 Jul 19983

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

1984–2026

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 6,458 measured fish were spread across different length ranges.

Smallest
0.8 cm
Lower quarter
4.7 cm
Median
7.9 cm
Upper quarter
10.2 cm
Largest
103.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ouse

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

Roach Perch Gudgeon Ruffe Pike Common bream

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 →