RiverFish

Ruffe · Gymnocephalus cernuus

Ruffe in the River Great Ouse

Largest measured ruffe: 10.3 cm

The largest ruffe measured in Environment Agency surveys of the River Great Ouse was 10.3 cm, recorded at DS Brownshill Staunch on 16 April 2026.

Across 4 measured ruffe, the median measured length was 8.7 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 Great Ouse.

See ruffe records across England →

Most recent observation16 April 2026DS Brownshill Staunch · 3 fish
Largest measured ruffe
10.3 cm
Median length
8.7 cm
Fish measured
4
Survey locations
5

Individual EA measurements

Largest measured ruffe

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
10.3 cm16 Apr 2026DS Brownshill Staunch180999
9.1 cm24 Oct 2012US A.G. Wright Sluice134395
8.2 cm16 Apr 2026DS Brownshill Staunch180999
7.1 cm16 Apr 2026DS Brownshill Staunch180999

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where ruffe were found

Each point marks a survey location with at least one ruffe 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 ruffe
DS Brownshill Staunch16 Apr 202616 Apr 20261
US A.G. Wright Sluice24 Oct 201224 Oct 20121
Pike & Eel17 Nov 201017 Nov 20101
US Denver Little Eye Sluice29 Oct 200829 Oct 20081
DS Brownshill Staunch17 Jul 200817 Jul 20081

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

2008–2026

Survey records by year

Each bar shows how many survey visits recorded ruffe that year.

Fish measured by surveyors

Measured length distribution

See how the 4 measured fish were spread across different length ranges.

Smallest
7.1 cm
Lower quarter
7.9 cm
Median
8.7 cm
Upper quarter
9.4 cm
Largest
10.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Great Ouse

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

Perch European eel Roach Pike Gudgeon

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 →