RiverFish

Ruffe · Gymnocephalus cernuus

Ruffe in the River Thames

Largest measured ruffe: 14.3 cm

The largest ruffe measured in Environment Agency surveys of the River Thames was 14.3 cm, recorded at Clifton Weir Stream on 5 July 2013.

Across 130 measured ruffe, the median measured length was 10.1 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 Thames.

See ruffe records across England →

Most recent observation24 September 2025Rushey to Shifford · 1 fish
Largest measured ruffe
14.3 cm
Median length
10.1 cm
Fish measured
130
Survey locations
24

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
14.3 cm5 Jul 2013Clifton Weir Stream137484
14 cm21 Jul 2019Abingdon - Culham (Margin)155303
13.7 cm28 Jul 2012Goring to Whitchurch (Margin)132661
13.4 cm5 Jul 1994Sandford - Abingdon - (Margin)106536
13.3 cm12 Jul 2016Hambleden - Hurley (margin)148463
13.3 cm1 Aug 2012Shiplake-marsh - (Margin)132717
13.3 cm16 Oct 2007Roundhouse to St Johns(margins)107539
12.9 cm29 Jul 2012Whitchurch to Mapledurham (Margin)132657
12.9 cm17 Jul 2011Clifton Hampden - Days (Margin)127590
12.8 cm21 Jul 2012Sandford - Abingdon - (Margin)132709

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
Rushey to Shifford14 Oct 200924 Sept 20252
Iffley - Sandford (Margin)2 Jun 200319 Jul 20238
Caversham-sonning - (Margin)16 Jul 200927 Jul 20192
Clifton Hampden - Days (Margin)4 Jul 199623 Jul 201912
Abingdon - Culham (Margin)7 Jul 199821 Jul 201910
Sandford - Abingdon - (Margin)20 Sept 199320 Jul 201912
Godstow to Osney3 Oct 20163 Oct 20161
Hambleden - Hurley (margin)19 Jul 200912 Jul 20164
Shiplake-marsh - (Margin)1 Aug 201211 Jul 20162
Cleeve-Goring - (Margin)12 Jul 20098 Jul 20162
Buscot to Grafton22 Oct 200729 Sept 20152
Days - Benson (Margin)18 Jul 200819 Jul 20153
Sonning - shiplake (Margin)17 Jul 200912 Jul 20133
Clifton Weir Stream17 Jul 20115 Jul 20132
Culham - Clifton Hampden (Margin)8 Jul 20024 Jul 20133
Whitchurch to Mapledurham (Margin)20 Jul 201029 Jul 20122
Goring to Whitchurch (Margin)28 Jul 201228 Jul 20121
Sandford Weir stream7 Jul 200914 Jul 20112
Buscot weir pool6 Oct 20065 Oct 20102
Eynsham- kings14 Jun 200116 Oct 20093
Roundhouse to St Johns(margins)5 Oct 200616 Oct 20072
Eynsham Weir Stream17 Mar 200617 Mar 20061
Sandford - Abingdon - Middle5 Jul 20015 Jul 20011
Clifton Hampden - Days (Middle)4 Jul 19964 Jul 19961

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

1993–2025

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 130 measured fish were spread across different length ranges.

Smallest
3.8 cm
Lower quarter
8.9 cm
Median
10.1 cm
Upper quarter
10.9 cm
Largest
14.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thames

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

Roach Bleak Pike Chub Perch 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 →