Roach · Rutilus rutilus

Roach in the River Dun

Largest measured roach: 30.7 cm

The largest roach measured in Environment Agency surveys of the River Dun was 30.7 cm, recorded at Freemans Marsh on 22 March 2006.

Across 47 measured roach, the median measured length was 21.4 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 Dun.

See roach records across England →

Most recent observation16 October 2025Beat 9 - Eel · 1 fish

Largest measured roach: 30.7 cm
Median length: 21.4 cm
Fish measured: 47
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
30.7 cm	22 Mar 2006	Freemans Marsh	90430
29.7 cm	22 Mar 2006	Freemans Marsh	90430
29 cm	27 Mar 2007	Freemans Marsh	104912
28.6 cm	22 Mar 2006	Freemans Marsh	90430
27.7 cm	27 Mar 2007	Freemans Marsh	104912
27.5 cm	22 Mar 2006	Freemans Marsh	90430
24.6 cm	22 Mar 2006	Freemans Marsh	90430
23.6 cm	27 Mar 2007	Freemans Marsh	104912
23.5 cm	27 Mar 2007	Freemans Marsh	104912
23.5 cm	22 Mar 2006	Freemans Marsh	90430

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
Beat 9 - Eel	16 Oct 2025	16 Oct 2025	1
Freemans Marsh- DS gauging weir	26 Aug 2010	26 Aug 2010	1
Freemans Marsh	22 Mar 2006	27 Mar 2007	2

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

2006–2025

Survey records by year

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

106

107

008

009

110

011

012

013

014

015

016

017

018

019

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 47 measured fish were spread across different length ranges.

Smallest: 9.2 cm
Lower quarter: 10.8 cm
Median: 21.4 cm
Upper quarter: 22.8 cm
Largest: 30.7 cm

0–99 mm

100–199 mm

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Dun

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

Brown / sea trout Bullhead Gudgeon Grayling Dace 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 →