RiverFish

Bleak · Alburnus alburnus

Bleak in the River Marlow

Largest measured bleak: 8.5 cm

The largest bleak measured in Environment Agency surveys of the River Marlow was 8.5 cm, recorded at Marlow Downstream Fry on 29 August 2013.

Across 812 measured bleak, the median measured length was 2.8 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 Marlow.

See bleak records across England →

Most recent observation22 August 2024Marlow Downstream Fry · 41 fish
Largest measured bleak
8.5 cm
Median length
2.8 cm
Fish measured
812
Survey locations
2

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
8.5 cm29 Aug 2013Marlow Downstream Fry138580
8.3 cm20 Aug 2007Marlow Downstream Fry108588
8.1 cm20 Aug 2007Marlow Downstream Fry108588
7.8 cm29 Aug 2013Marlow Downstream Fry138580
7.8 cm20 Aug 2007Marlow Downstream Fry108588
7.3 cm20 Aug 2007Marlow Downstream Fry108588
7.2 cm20 Aug 2007Marlow Downstream Fry108588
7 cm20 Aug 2007Marlow Downstream Fry108588
6.8 cm20 Aug 2007Marlow Downstream Fry108588
6.7 cm26 Aug 2003Marlow Downstream Fry112211

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
Marlow Upstream Fry26 Aug 200322 Aug 202412
Marlow Downstream Fry26 Aug 200322 Aug 202414

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

2003–2024

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 812 measured fish were spread across different length ranges.

Smallest
1.2 cm
Lower quarter
2.4 cm
Median
2.8 cm
Upper quarter
3.5 cm
Largest
8.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Marlow

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

Minnow Gudgeon Chub Roach Dace Perch

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 →