Perch · Perca fluviatilis

Perch in the Sandon Brook (Main Reaches)

Largest measured perch: 29.3 cm

The largest perch measured in Environment Agency surveys of the Sandon Brook (Main Reaches) was 29.3 cm, recorded at Boreham Bridge (Sandon Brook) on 28 April 1995.

Across 406 measured perch, the median measured length was 13.8 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 perch records across England →

Most recent observation9 May 2025Boreham Bridge (Sandon Brook) · 58 fish

Largest measured perch: 29.3 cm
Median length: 13.8 cm
Fish measured: 406
Survey locations: 4

Individual EA measurements

Largest measured perch

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
29.3 cm	28 Apr 1995	Boreham Bridge (Sandon Brook)	14494
27.3 cm	20 May 1998	Boreham Bridge (Sandon Brook)	14498
26 cm	21 May 1998	Baddow Fruit Farm	14499
25.1 cm	4 Jun 2001	Boreham Bridge (Sandon Brook)	15597
25 cm	4 Jun 2001	Boreham Bridge (Sandon Brook)	15597
24.2 cm	22 May 1998	Graces Walk	14500
24 cm	9 May 2013	Boreham Bridge (Sandon Brook)	137376
24 cm	4 Jun 2001	Boreham Bridge (Sandon Brook)	15597
23.8 cm	16 May 1986	Danbury Road FGS	14485
23.5 cm	28 Apr 1995	Boreham Bridge (Sandon Brook)	14494

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where perch were found

Each point marks a survey location with at least one perch 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 perch
Boreham Bridge (Sandon Brook)	9 May 1986	9 May 2025	9
Graces Walk	2 May 1995	8 May 2025	5
Danbury Road FGS	16 May 1986	29 May 2001	3
Baddow Fruit Farm	1 May 1995	21 May 1998	2

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 perch that year.

286

087

088

189

090

091

192

093

094

395

096

097

498

099

000

301

002

003

004

005

006

107

008

009

010

011

012

213

014

015

016

017

018

019

020

021

022

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 406 measured fish were spread across different length ranges.

Smallest: 7 cm
Lower quarter: 11.3 cm
Median: 13.8 cm
Upper quarter: 16.2 cm
Largest: 29.3 cm

0–99 mm

100–199 mm

301

200–299 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 Roach Dace Pike Gudgeon

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 →