Roach · Rutilus rutilus

Roach in the River Ash (Thames)

Largest measured roach: 29 cm

The largest roach measured in Environment Agency surveys of the River Ash (Thames) was 29 cm, recorded at Gaston Bridge on 13 October 2005.

Across 509 measured roach, the median measured length was 11.5 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 Ash (Thames).

See roach records across England →

Most recent observation5 September 2023Gaston Bridge · 74 fish

Largest measured roach: 29 cm
Median length: 11.5 cm
Fish measured: 509
Survey locations: 3

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
29 cm	13 Oct 2005	Gaston Bridge	86943
27.2 cm	13 Oct 2005	Gaston Bridge	86943
24.5 cm	13 Oct 2005	Gaston Bridge	86943
24.3 cm	23 Aug 2011	Gaston Bridge	127566
24.2 cm	23 Aug 2011	Gaston Bridge	127566
23 cm	13 Oct 2005	Gaston Bridge	86943
22.6 cm	23 Aug 2011	Gaston Bridge	127566
22.5 cm	13 Oct 2005	Gaston Bridge	86943
22.3 cm	13 Oct 2005	Gaston Bridge	86943
21.4 cm	23 Aug 2011	Gaston Bridge	127566

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
Gaston Bridge	13 Oct 2005	5 Sept 2023	5
US Ford Bridge Roundabout	24 Aug 2017	24 Aug 2017	1
Ford Bridge Roundabout	20 Aug 2010	24 Aug 2017	2

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

2005–2023

Survey records by year

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

105

006

007

008

009

210

111

012

013

014

015

016

317

018

019

020

021

022

123

Fish measured by surveyors

Measured length distribution

See how the 509 measured fish were spread across different length ranges.

Smallest: 3.1 cm
Lower quarter: 8.2 cm
Median: 11.5 cm
Upper quarter: 14.4 cm
Largest: 29 cm

0–99 mm

204

100–199 mm

290

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ash (Thames)

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

European eel Chub Dace Gudgeon Perch Pike

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 →