Gudgeon · Gobio gobio

Gudgeon in the Itchen Navigation

Largest measured gudgeon: 15 cm

The largest gudgeon measured in Environment Agency surveys of the Itchen Navigation was 15 cm, recorded at Ham Farm on 2 September 2019.

Across 39 measured gudgeon, the median measured length was 12.9 cm.

Surveyors recorded weights for 13 gudgeon. The median was 0.8 oz (0.023 kg) and the largest recorded weight was 1.3 oz (0.037 kg).

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

See gudgeon records across England →

Most recent observation27 October 2025Ham Farm · 1 fish

Largest measured gudgeon: 15 cm
Median length: 12.9 cm
Fish measured: 39
Survey locations: 2

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	2 Sept 2019	Ham Farm	155311
15 cm	2 Sept 2019	Ham Farm	155311
14.9 cm	1 Sept 2009	Ham Farm	119588
14.6 cm	1 Sept 2009	Ham Farm	119588
14.5 cm	18 Sept 2015	Ham Farm	146671
14.3 cm	18 Sept 2015	Ham Farm	146671
14.2 cm	2 Sept 2019	Ham Farm	155311
14 cm	2 Sept 2019	Ham Farm	155311
13.7 cm	1 Sept 2009	Ham Farm	119588
13.6 cm	1 Sept 2009	Ham Farm	119588

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
Ham Farm	15 Aug 2002	27 Oct 2025	9
Allbrook Lock	18 Sept 2002	19 Sept 2006	4

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

2002–2025

Survey records by year

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

202

003

104

105

106

007

008

109

010

111

012

113

014

115

016

017

018

119

020

021

122

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 39 measured fish were spread across different length ranges.

Smallest: 8.8 cm
Lower quarter: 11.5 cm
Median: 12.9 cm
Upper quarter: 13.6 cm
Largest: 15 cm

0–99 mm

100–199 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 13 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.5 oz (0.013 kg)
Lower quarter: 0.7 oz (0.019 kg)
Median: 0.8 oz (0.023 kg)
Upper quarter: 1 oz (0.028 kg)
Heaviest: 1.3 oz (0.037 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the Itchen Navigation

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

European eel Pike Minnow Roach Grayling Atlantic salmon

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 →