Roach · Rutilus rutilus

Roach in the Sandon Brook (Main Reaches)

Largest measured roach: 32 cm

The largest roach measured in Environment Agency surveys of the Sandon Brook (Main Reaches) was 32 cm, recorded at Danbury Road FGS on 11 May 1992.

Across 2,491 measured roach, the median measured length was 11.9 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Sandon Brook (Main Reaches).

See roach records across England →

Most recent observation9 May 2025Boreham Bridge (Sandon Brook) · 156 fish

Largest measured roach: 32 cm
Median length: 11.9 cm
Fish measured: 2,491
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
32 cm	11 May 1992	Danbury Road FGS	14493
31.3 cm	2 May 1989	Danbury Road FGS	14489
30 cm	16 May 1986	Danbury Road FGS	14485
29.5 cm	2 May 1989	Danbury Road FGS	14489
29.3 cm	16 May 1986	Danbury Road FGS	14485
28.7 cm	16 May 1986	Danbury Road FGS	14485
28.7 cm	9 May 1986	Boreham Bridge (Sandon Brook)	14482
28 cm	16 May 1986	Danbury Road FGS	14485
27.5 cm	16 May 1986	Danbury Road FGS	14485
27.1 cm	1 Jun 2001	Baddow Fruit Farm	15598

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
Boreham Bridge (Sandon Brook)	9 May 1986	9 May 2025	9
Graces Walk	27 Apr 1989	8 May 2025	9
Baddow Fruit Farm	13 May 1986	1 Jun 2001	5
Danbury Road FGS	16 May 1986	29 May 2001	6

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

389

090

091

492

093

094

495

096

097

498

099

000

401

002

003

004

005

006

207

008

009

010

011

012

213

014

015

016

017

018

119

020

021

022

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 2,491 measured fish were spread across different length ranges.

Smallest: 3.2 cm
Lower quarter: 9.2 cm
Median: 11.9 cm
Upper quarter: 14.5 cm
Largest: 32 cm

0–99 mm

787

100–199 mm

1591

200–299 mm

110

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Sandon Brook (Main Reaches)

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

Chub European eel Dace Pike Gudgeon Minnow

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 →