RiverFish

Roach · Rutilus rutilus

Roach in the River Thames

Largest measured roach: 43.5 cm

The largest roach measured in Environment Agency surveys of the River Thames was 43.5 cm, recorded at Sandford - Abingdon - Middle on 7 July 1997.

Across 99,162 measured roach, the median measured length was 11.8 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 Thames.

See roach records across England →

Most recent observation16 October 2025Hannington Bridge · 32 fish
Largest measured roach
43.5 cm
Median length
11.8 cm
Fish measured
99,162
Survey locations
83

Individual EA measurements

Largest measured roach

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

LengthSurvey dateSurvey locationSurvey ID
43.5 cm7 Jul 1997Sandford - Abingdon - Middle107001
38.5 cm13 Oct 2011Castle Eaton129741
37.8 cm18 Sept 2024Northmoor- Pinkhill168752
35.9 cm19 Sept 2005Rushey Weir Pool86242
35.2 cm25 Jun 2018Godstow Weirpool152829
34.7 cm7 Jul 2003Days - Benson (Middle)76416
34.4 cm22 Jul 2011Caversham-sonning - (Margin)127428
34.4 cm19 Oct 2004Godstow to Osney83082
34.3 cm19 Jun 2001Godstow to Osney79323
34.2 cm25 Jun 2018Port Meadow (Day/Night)152957

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

Explore the river

Where roach were found

Each point marks a survey location with at least one roach 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 roach
Hannington Bridge29 Aug 200316 Oct 202512
Castle Eaton23 May 200216 Oct 202515
Cricklade23 May 200214 Oct 202514
Godstow to Osney19 Jun 200126 Sept 202519
Eynsham- kings14 Jun 200126 Sept 202518
Northmoor- Pinkhill12 Jun 200125 Sept 202518
Rushey to Shifford7 Jun 200124 Sept 202520
Buscot to Grafton5 Jun 200123 Sept 202518
Roundhouse to St Johns(margins)26 Jun 200222 Sept 202519
Hambleden - Hurley (margin)24 Jul 200125 Jul 202517
Hambleden - Hurley (Weirpool)23 Jul 200325 Jul 202514
Shiplake-marsh - (Margin)24 Jul 200224 Jul 202516
Shiplake - Marsh (Weirpool)22 Jul 200324 Jul 202514
Caversham-sonning - (Margin)17 Jul 200123 Jul 202517
Caversham (Weirpool)17 Jul 200323 Jul 202513
Whitchurch to Mapledurham (Margin)12 Jul 200122 Jul 202517
Whitchurch (Weirpool)12 Jul 200122 Jul 202516
Cleeve-Goring - (Margin)3 Jul 200121 Jul 202517
Cleeve - Goring (Weirpool)15 Jul 200321 Jul 20258
Days weirpool11 Jul 200920 Jul 202514
Days - Benson (Margin)24 Sept 199320 Jul 202529
Clifton Weir Stream17 Jul 200819 Jul 202515
Clifton Hampden - Days (Margin)23 Sept 199319 Jul 202529
Culham Weirpool15 Jul 200818 Jul 202514
Culham - Clifton Hampden (Margin)22 Sept 199318 Jul 202529
Abingdon Weirpool8 Jul 200915 Jul 202514
Abingdon - Culham (Margin)21 Sept 199315 Jul 202530
Sandford Weir stream7 Jul 200910 Jul 20259
Sandford - Abingdon - (Margin)20 Sept 199310 Jul 202530
Iffley - Sandford (Margin)11 Jul 19999 Jul 202524
Godstow Weirpool23 Oct 201329 Sept 20239
Shifford Fish Pass2 Nov 20222 Nov 20221
Water eaton2 Oct 200218 Oct 202212
Port Meadow (Day/Night)22 Jun 201816 Jul 20196
Canal confluence to Marina22 Jun 201815 Jul 20195
Days weirpool (daytime)11 Jul 201811 Jul 20181
Days - Benson (daytime)11 Jul 201811 Jul 20181
Sutton Pools7 Oct 20147 Oct 20141
Rushey bypass channel18 Sept 201418 Sept 20141
Mapledurham Mill Channel22 Jul 200816 Apr 20142
Shifford Lock Cut18 Oct 201318 Oct 20131
Radcot - Rushey17 Oct 201317 Oct 20131
St John's Lock Cut16 Oct 201316 Oct 20131
Buscot weir pool24 Sept 200316 Oct 20137
Radcot Fish Pass25 Sept 201325 Sept 20131
Hailstone farm18 Mar 200421 Aug 20132
Sonning Weir17 Jul 200912 Jul 20133
Sonning - shiplake (Margin)17 Jul 200912 Jul 20135
Goring weir pool20 Jul 20089 Jul 20136
Goring to Whitchurch (Margin)20 Jul 20089 Jul 20136
Benson Weirpool26 Jul 20127 Jul 20132
u/s of Waterhay Bridge15 May 201315 May 20131
Cerney Wick Brook10 Apr 201310 Apr 20131
Sonning Weirstream22 Jul 201031 Jul 20122
Rushey Weir Pool12 Oct 200425 Oct 20117
Eynsham weirpool1 Oct 20038 Oct 20105
Northmoor Wier pool26 Sept 200323 Oct 20084
Marsh - Hambleden (Margin)24 Jul 200824 Jul 20081
Loddon - Confluence to St Pats Stream24 Jul 200824 Jul 20081
Mapledurham weirpool22 Jul 200822 Jul 20081
Mapledurham - Caversham (Margin)22 Jul 200822 Jul 20081
Shifford to Newbridge - Windrush Confluence23 Oct 200723 Oct 20071
Newbridge - Windrush Confluence - to Northmoor23 Oct 200723 Oct 20071
Eynsham Weir Stream17 Mar 20067 Sept 20073
Port Meadow1 Sept 20071 Sept 20071
Donnington Bridge1 Sept 20071 Sept 20071
St Patricks stream16 Nov 200616 Nov 20061
Godstow weirstream1 Oct 200326 Sept 20052
Days - Benson (Middle)24 Sept 19939 Jul 200512
Clifton Hampden - Days (Middle)23 Sept 19938 Jul 200512
Culham - Clifton Hampden (Middle)22 Sept 19937 Jul 200512
Abingdon - Culham (Middle)21 Sept 19936 Jul 200512
Sandford - Abingdon - Middle20 Sept 19935 Jul 200512
Iffley - Sandford (Middle)11 Jul 19994 Jul 20056
Lower Mill Estate23 Mar 200423 Mar 20041
Waterhay bridge18 Mar 200418 Mar 20041
400yds d/s hannington B-small trib on RB24 Sept 200224 Sept 20021
Hambleden - Hurley (middle)24 Jul 200125 Jul 20022
Shiplake-Marsh - (Mid-River)24 Jul 200224 Jul 20021
Caversham-sonning - (Mid River)17 Jul 200123 Jul 20022
Whitchurch - Mapledurham (Middle)12 Jul 200118 Jul 20022
Cleeve-Goring - (Mid River)3 Jul 200117 Jul 20022
Roundhouse to St Johns(mid-river)26 Jun 200226 Jun 20021

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 roach that year.

Fish measured by surveyors

Measured length distribution

See how the 99,162 measured fish were spread across different length ranges.

Smallest
1.8 cm
Lower quarter
9.5 cm
Median
11.8 cm
Upper quarter
14.3 cm
Largest
43.5 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.

Bleak Pike Chub Perch Dace 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 →