RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Thame

Largest measured gudgeon: 18.5 cm

The largest gudgeon measured in Environment Agency surveys of the River Thame was 18.5 cm, recorded at Cuddesdon on 3 September 2019.

Across 5,116 measured gudgeon, the median measured length was 8.6 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 Thame.

See gudgeon records across England →

Most recent observation18 September 2025D/s Bear Brook · 75 fish
Largest measured gudgeon
18.5 cm
Median length
8.6 cm
Fish measured
5,116
Survey locations
21

Individual EA measurements

Largest measured gudgeon

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
18.5 cm3 Sept 2019Cuddesdon155497
16.6 cm2 Sept 2009Waterstock Mill120317
15.8 cm2 Sept 2010Ickford Bridge124867
14.2 cm2 Sept 2010Shabbington (West Arm)124869
14.1 cm9 Sept 2009Chiselhampton120324
14.1 cm14 Oct 2003Dorchester Road Bridge77749
13.6 cm2 Sept 2009Waterstock Mill120317
13.6 cm15 Jul 2008Eythrope_ByPass Channel Site Two112007
13.6 cm5 Sept 2006Upstream of Notley Abbey101187
13.4 cm28 Sept 2010Old Crendon Road Bridge124916

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 surveyedFirst recordedLast recordedVisits finding gudgeon
D/s Bear Brook11 Sept 200318 Sept 20252
Dorchester Road Bridge14 Oct 200317 Sept 202512
Chiselhampton18 Sept 200317 Sept 202511
Waterstock Mill20 Sept 200416 Sept 202511
Cuddesdon19 Sept 200316 Sept 202512
Ickford Bridge3 Sept 200311 Sept 202512
Old Crendon Road Bridge4 Sept 20039 Sept 202511
Upstream of Notley Abbey20 Aug 200216 Sept 202212
Shabbington (West Arm)20 Aug 200221 Aug 201912
Nether Winchendon - Lower Riffle5 Aug 200218 Aug 201711
Downstream Eythrope16 Aug 201616 Aug 20161
Eythrope_ByPass Channel Site Two15 Jul 20084 Aug 20143
Eythrope_ByPass Channel Site One15 Jul 200829 Jul 20132
Kingsey Cuttle Brook24 Aug 20057 Sept 20102
Eythrope_Riffles Site Two16 Jul 20089 Jul 20102
Eythrope_Historic Channel Site Three8 Jul 20108 Jul 20101
Eythrope1 Aug 20028 Sept 20095
Eythrope_Riffles Site Three17 Jul 200817 Jul 20081
Eythrope_Riffles Site One16 Jul 200816 Jul 20081
Eythrope_Historic Channel Site Two14 Jul 200814 Jul 20081
Nether Winchendon - Original Enhancement5 Aug 200210 Sept 20032

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.

Fish measured by surveyors

Measured length distribution

See how the 5,116 measured fish were spread across different length ranges.

Smallest
2.3 cm
Lower quarter
7.2 cm
Median
8.6 cm
Upper quarter
9.8 cm
Largest
18.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thame

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

Chub Roach Dace Perch Pike Bleak

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 →