RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Ouzel

Largest measured gudgeon: 17.3 cm

The largest gudgeon measured in Environment Agency surveys of the River Ouzel was 17.3 cm, recorded at Open University on 12 December 1997.

Across 2,270 measured gudgeon, the median measured length was 9.4 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 Ouzel.

See gudgeon records across England →

Most recent observation16 April 2026DS Caldecote Mill · 1 fish
Largest measured gudgeon
17.3 cm
Median length
9.4 cm
Fish measured
2,270
Survey locations
16

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
17.3 cm12 Dec 1997Open University29061
16.3 cm12 Dec 1997Open University29061
15.8 cm12 Dec 1997Open University29061
14.8 cm26 Nov 1997Billington29056
14.8 cm4 Jan 1995Open University29054
14.8 cm14 Dec 1994Manor Sports Field29052
14.3 cm12 Dec 1997Open University29061
14.3 cm4 Jan 1995Open University29054
14.3 cm4 Jan 1995Open University29054
14.3 cm15 Dec 1994Simpson Ouzel29053

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
DS Caldecote Mill17 Jun 201316 Apr 20262
Manor Sports Field28 Oct 198631 Jul 202517
Open University4 Jan 199510 Jul 201914
Leighton Buzzard16 Nov 19908 Jul 201915
US Open University3 Sept 20146 Oct 20174
US Leighton Buzzard21 Mar 201621 Mar 20161
US Billington12 Apr 200718 Jun 20132
Eton Bray24 May 201324 May 20131
M1 Road Bridge8 Nov 199013 May 20105
Caldecote Mill6 Nov 199012 May 201012
Castle Meadow22 Nov 199030 Apr 20099
Newport Pagnell7 Nov 199013 Apr 20042
Cotton Valley STW9 Nov 19902 Apr 20042
Simpson Ouzel21 Nov 199029 Mar 20044
Stoke Hammond5 Dec 199724 Mar 20042
Billington27 Oct 198626 Nov 19974

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

1986–2026

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 2,270 measured fish were spread across different length ranges.

Smallest
2.8 cm
Lower quarter
8.1 cm
Median
9.4 cm
Upper quarter
11.1 cm
Largest
17.3 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Ouzel

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

Perch Roach Dace Bullhead Minnow 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 →