Roach · Rutilus rutilus

Roach in the River Mardyke

Largest measured roach: 28.3 cm

The largest roach measured in Environment Agency surveys of the River Mardyke was 28.3 cm, recorded at Grangewater on 25 September 2001.

Across 2,694 measured roach, the median measured length was 13.2 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 Mardyke.

See roach records across England →

Most recent observation2 May 2025North Stifford · 73 fish

Largest measured roach: 28.3 cm
Median length: 13.2 cm
Fish measured: 2,694
Survey locations: 5

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
28.3 cm	25 Sept 2001	Grangewater	20100
28.1 cm	24 Mar 1992	Grangewater	14720
26.3 cm	13 May 1998	North Stifford	14731
26.2 cm	24 Sept 2001	North Stifford	20122
25.8 cm	23 Apr 2013	Grangewater	135914
25.5 cm	24 Sept 2001	North Stifford	20122
24.9 cm	25 Sept 2001	Grangewater	20100
24.8 cm	13 May 1998	North Stifford	14731
24.7 cm	25 Apr 2013	North Stifford	136904
24.6 cm	23 Apr 2013	Grangewater	135914

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
North Stifford	25 Mar 1992	2 May 2025	8
14 Arches Bridge	14 May 1998	30 May 2019	5
Grangewater	17 Apr 1986	23 Apr 2013	6
Circus Tavern	15 Apr 1986	18 May 2007	4
M25-A13	19 Mar 1986	17 May 2007	5

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

1986–2025

Survey records by year

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

386

087

088

089

090

091

292

093

094

295

096

097

598

099

000

501

002

003

004

005

006

507

008

009

010

011

012

313

014

015

016

017

018

219

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 2,694 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 8 cm
Median: 13.2 cm
Upper quarter: 16.8 cm
Largest: 28.3 cm

0–99 mm

1105

100–199 mm

1290

200–299 mm

299

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mardyke

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

European eel 3-spined stickleback Rudd Tench Common carp Golden goldfish

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 →