Roach · Rutilus rutilus

Roach in the River Thames Tribs

Largest measured roach: 24 cm

The largest roach measured in Environment Agency surveys of the River Thames Tribs was 24 cm, recorded at Roundmoor Ditch on 5 November 2019.

Across 639 measured roach, the median measured length was 8.2 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 Tribs.

See roach records across England →

Most recent observation5 November 2019Roundmoor Ditch · 15 fish

Largest measured roach: 24 cm
Median length: 8.2 cm
Fish measured: 639
Survey locations: 4

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
24 cm	5 Nov 2019	Roundmoor Ditch	155944
21.8 cm	6 Oct 2006	Bray Mill Stream	101770
21.1 cm	6 Oct 2006	Bray Mill Stream	101770
20.3 cm	6 Oct 2006	Bray Mill Stream	101770
20 cm	5 Nov 2019	Roundmoor Ditch	155944
19.9 cm	5 Nov 2019	Roundmoor Ditch	155944
19.7 cm	23 Sept 2015	Odney Stream	146676
19.4 cm	8 Aug 2006	Odney Stream	100523
18.8 cm	5 Nov 2019	Roundmoor Ditch	155944
18.7 cm	8 Aug 2006	Odney Stream	100523

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
Roundmoor Ditch	5 Nov 2019	5 Nov 2019	1
Odney Stream	8 Aug 2006	23 Sept 2015	3
Bray Mill Stream	6 Oct 2006	21 Sept 2015	3
Tangier Mill Stream	22 Apr 2009	22 Apr 2009	1

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

2006–2019

Survey records by year

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

206

007

008

309

010

011

012

013

014

215

016

017

018

119

Fish measured by surveyors

Measured length distribution

See how the 639 measured fish were spread across different length ranges.

Smallest: 3.3 cm
Lower quarter: 5.4 cm
Median: 8.2 cm
Upper quarter: 12 cm
Largest: 24 cm

0–99 mm

416

100–199 mm

218

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thames Tribs

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

Chub Dace Gudgeon European eel Perch Barbel

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 →