Gudgeon · Gobio gobio

Gudgeon in the Belchamp Brook (Main Reaches)

Largest measured gudgeon: 12.9 cm

The largest gudgeon measured in Environment Agency surveys of the Belchamp Brook (Main Reaches) was 12.9 cm, recorded at Bardfield Bridge on 18 April 1988.

Across 66 measured gudgeon, the median measured length was 8.2 cm.

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

See gudgeon records across England →

Most recent observation29 May 2026Gas Pipe Mark · 3 fish

Largest measured gudgeon: 12.9 cm
Median length: 8.2 cm
Fish measured: 66
Survey locations: 3

Individual EA measurements

Largest measured gudgeon

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
12.9 cm	18 Apr 1988	Bardfield Bridge	13811
11.2 cm	25 May 2006	Gas Pipe Mark	90857
11.2 cm	18 Apr 1988	Bardfield Bridge	13811
11 cm	18 Apr 1988	Bardfield Bridge	13811
10.9 cm	29 May 2026	Gas Pipe Mark	181511
10.3 cm	5 Jul 2021	Gas Pipe Mark	160205
10.3 cm	18 Apr 1988	Bardfield Bridge	13811
10.2 cm	20 Feb 1985	Brundon (Belchamp Brook)	13806
9.9 cm	20 Feb 1985	Brundon (Belchamp Brook)	13806
9.8 cm	20 Feb 1985	Gas Pipe Mark	13807

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

Explore the river

Where gudgeon were found

Each point marks a survey location with at least one gudgeon 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 gudgeon
Gas Pipe Mark	20 Feb 1985	29 May 2026	9
Bardfield Bridge	19 Feb 1985	12 May 1994	3
Brundon (Belchamp Brook)	20 Feb 1985	20 Apr 1988	2

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

1985–2026

Survey records by year

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

385

086

087

288

089

090

091

092

093

294

095

096

097

098

099

000

001

002

003

004

005

106

007

008

009

010

011

012

013

114

015

116

017

118

019

020

121

022

023

124

025

126

Fish measured by surveyors

Measured length distribution

See how the 66 measured fish were spread across different length ranges.

Smallest: 4.6 cm
Lower quarter: 7.5 cm
Median: 8.3 cm
Upper quarter: 9.2 cm
Largest: 12.9 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Belchamp Brook (Main Reaches)

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

Pike Chub Bullhead Roach Dace 3-spined stickleback

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 →