Gudgeon · Gobio gobio

Gudgeon in the Wraysbury River

Largest measured gudgeon: 18.4 cm

The largest gudgeon measured in Environment Agency surveys of the Wraysbury River was 18.4 cm, recorded at Harmondsworth Moor on 4 August 2004.

Across 296 measured gudgeon, the median measured length was 10.2 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Wraysbury River.

See gudgeon records across England →

Most recent observation15 May 2024Harmondsworth Moor · 15 fish

Largest measured gudgeon: 18.4 cm
Median length: 10.2 cm
Fish measured: 296
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
18.4 cm	4 Aug 2004	Harmondsworth Moor	80906
17.4 cm	5 Jun 2014	Harmondsworth Moor	141014
16.5 cm	15 May 2024	Harmondsworth Moor	165570
13.5 cm	23 Jun 2010	Harmondsworth Moor	122462
13.1 cm	5 Jun 2014	Harmondsworth Moor	141014
13.1 cm	21 Jun 2011	Harmondsworth Moor	126602
12.8 cm	3 Sept 2003	Harmondsworth Moor	76923
12.7 cm	18 Jun 2015	Harmondsworth Moor	144973
12.7 cm	3 Jun 2013	Harmondsworth Moor	136267
12.6 cm	18 Jun 2015	Harmondsworth Moor	144973

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
Harmondsworth Moor	3 Sept 2003	15 May 2024	15
Heathrow Wraysbury River Zone H	22 Oct 2019	22 Oct 2019	1
Heathrow Wraysbury River Zone F	22 Oct 2019	22 Oct 2019	1

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

2003–2024

Survey records by year

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

103

104

105

106

107

108

109

110

111

112

113

114

115

016

017

118

219

020

021

022

023

124

Fish measured by surveyors

Measured length distribution

See how the 296 measured fish were spread across different length ranges.

Smallest: 3 cm
Lower quarter: 9 cm
Median: 10.3 cm
Upper quarter: 11.2 cm
Largest: 18.4 cm

0–99 mm

129

100–199 mm

167

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Wraysbury River

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

Chub Dace Minnow Perch Bullhead 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 →