RiverFish

Roach · Rutilus rutilus

Roach in the River Thame

Largest measured roach: 30.2 cm

The largest roach measured in Environment Agency surveys of the River Thame was 30.2 cm, recorded at Upstream of Notley Abbey on 23 September 2004.

Across 7,101 measured roach, the median measured length was 9.5 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 Thame.

See roach records across England →

Most recent observation18 September 2025D/s Bear Brook · 27 fish
Largest measured roach
30.2 cm
Median length
9.5 cm
Fish measured
7,101
Survey locations
22

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
30.2 cm23 Sept 2004Upstream of Notley Abbey82518
29.1 cm26 Sept 2006D/s Bear Brook101545
27.3 cm14 Jul 2008Eythrope_Historic Channel Site Three112005
26.3 cm22 Sept 2008Old Crendon Road Bridge114939
26.2 cm20 Aug 2002Upstream of Notley Abbey73227
25.6 cm4 Sept 2007Chiselhampton106635
25.4 cm16 Sept 2004Nether Winchendon - Lower Riffle82541
25.3 cm9 Oct 2003Upstream of Notley Abbey77738
25.3 cm20 Aug 2002Upstream of Notley Abbey73227
25.1 cm2 Sept 2009Waterstock Mill120317

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
D/s Bear Brook11 Sept 200318 Sept 20255
Dorchester Road Bridge14 Oct 200317 Sept 202512
Chiselhampton18 Sept 200317 Sept 202512
Waterstock Mill20 Sept 200416 Sept 202511
Cuddesdon19 Sept 200316 Sept 202512
Ickford Bridge3 Sept 200311 Sept 202513
Old Crendon Road Bridge4 Sept 20039 Sept 202512
Nether Winchendon - Lower Riffle5 Aug 200228 Aug 202511
Upstream of Notley Abbey20 Aug 200216 Sept 202213
Downstream Eythrope16 Aug 201613 Sept 20223
Shabbington (West Arm)20 Aug 200221 Aug 201912
Eythrope_Historic Channel Site Three14 Jul 20084 Aug 20144
Eythrope_ByPass Channel Site Two15 Jul 20084 Aug 20143
Eythrope_ByPass Channel Site One15 Jul 200829 Jul 20132
Kingsey Cuttle Brook7 Sept 20107 Sept 20101
Eythrope_Riffles Site Two16 Jul 20089 Jul 20102
Eythrope1 Aug 20028 Sept 20096
Eythrope_Riffles Site Three17 Jul 200817 Jul 20081
Eythrope_Riffles Site One16 Jul 200816 Jul 20081
Eythrope_Historic Channel Site Two14 Jul 200814 Jul 20081
Eythrope_Historic Channel Site One14 Jul 200814 Jul 20081
Nether Winchendon - Original Enhancement5 Aug 200210 Sept 20032

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

2002–2025

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 7,101 measured fish were spread across different length ranges.

Smallest
2.4 cm
Lower quarter
7.2 cm
Median
9.5 cm
Upper quarter
12.3 cm
Largest
30.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thame

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

Chub Gudgeon Dace Perch Pike Bleak

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 →