Roach · Rutilus rutilus

Roach in the Wraysbury River

Largest measured roach: 20.4 cm

The largest roach measured in Environment Agency surveys of the Wraysbury River was 20.4 cm, recorded at Harmondsworth Moor on 21 June 2011.

Across 182 measured roach, the median measured length was 11 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Wraysbury River.

See roach records across England →

Most recent observation15 May 2024Harmondsworth Moor · 15 fish

Largest measured roach: 20.4 cm
Median length: 11 cm
Fish measured: 182
Survey locations: 2

Individual EA measurements

Largest measured roach

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

Length	Survey date	Survey location	Survey ID
20.4 cm	21 Jun 2011	Harmondsworth Moor	126602
18.9 cm	15 May 2024	Harmondsworth Moor	165570
18.3 cm	18 Jun 2015	Harmondsworth Moor	144973
18.2 cm	22 Oct 2019	Heathrow Wraysbury River Zone F	155853
18.2 cm	5 Jun 2018	Harmondsworth Moor	152633
17.5 cm	15 May 2024	Harmondsworth Moor	165570
17.5 cm	21 Jun 2011	Harmondsworth Moor	126602
17.4 cm	21 Jun 2011	Harmondsworth Moor	126602
17.2 cm	24 Jun 2008	Harmondsworth Moor	111536
17 cm	22 Oct 2019	Heathrow Wraysbury River Zone F	155853

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 surveyed	First recorded	Last recorded	Visits finding roach
Harmondsworth Moor	3 Sept 2003	15 May 2024	15
Heathrow Wraysbury River Zone F	22 Oct 2019	22 Oct 2019	1

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 roach that year.

103

104

105

106

107

108

109

110

111

012

113

114

115

016

017

118

119

020

021

022

123

124

Fish measured by surveyors

Measured length distribution

See how the 182 measured fish were spread across different length ranges.

Smallest: 3.1 cm
Lower quarter: 8.9 cm
Median: 11 cm
Upper quarter: 13.6 cm
Largest: 20.4 cm

0–99 mm

100–199 mm

112

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Wraysbury River

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

Chub Dace Gudgeon Minnow Perch Bullhead

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 →