Gudgeon · Gobio gobio

Gudgeon in the River Ash (Thames)

Largest measured gudgeon: 15 cm

The largest gudgeon measured in Environment Agency surveys of the River Ash (Thames) was 15 cm, recorded at Gaston Bridge on 13 October 2005.

Across 88 measured gudgeon, the median measured length was 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 River Ash (Thames).

See gudgeon records across England →

Most recent observation5 September 2023Gaston Bridge · 22 fish

Largest measured gudgeon: 15 cm
Median length: 8 cm
Fish measured: 88
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
15 cm	13 Oct 2005	Gaston Bridge	86943
14.2 cm	13 Oct 2005	Gaston Bridge	86943
13.5 cm	5 Sept 2023	Gaston Bridge	164327
13.5 cm	23 Aug 2011	Gaston Bridge	127566
13.5 cm	13 Oct 2005	Gaston Bridge	86943
13.5 cm	13 Oct 2005	Gaston Bridge	86943
13.3 cm	5 Sept 2023	Gaston Bridge	164327
12.8 cm	5 Sept 2023	Gaston Bridge	164327
12 cm	5 Sept 2023	Gaston Bridge	164327
11.9 cm	5 Sept 2023	Gaston Bridge	164327

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
Gaston Bridge	13 Oct 2005	5 Sept 2023	5
US Ford Bridge Roundabout	24 Aug 2017	24 Aug 2017	1
Ford Bridge Roundabout	20 Aug 2010	24 Aug 2017	2

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

2005–2023

Survey records by year

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

105

006

007

008

009

210

111

012

013

014

015

016

317

018

019

020

021

022

123

Fish measured by surveyors

Measured length distribution

See how the 88 measured fish were spread across different length ranges.

Smallest: 1.5 cm
Lower quarter: 7.1 cm
Median: 8 cm
Upper quarter: 10.5 cm
Largest: 15 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ash (Thames)

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

European eel Chub Dace Roach Perch 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 →