RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Alt

Largest measured gudgeon: 14.5 cm

The largest gudgeon measured in Environment Agency surveys of the River Alt was 14.5 cm, recorded at Bull Bridge on 18 October 2007.

Across 150 measured gudgeon, the median measured length was 11.1 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 Alt.

See gudgeon records across England →

Most recent observation1 May 2026Alt Weir Downstream · 42 fish
Largest measured gudgeon
14.5 cm
Median length
11.1 cm
Fish measured
150
Survey locations
6

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
14.5 cm18 Oct 2007Bull Bridge108830
14.2 cm31 Aug 2005Bull Bridge87759
13.9 cm18 Oct 2007Bull Bridge108830
13.8 cm18 Oct 2007Bull Bridge108830
13.8 cm31 Aug 2005Bull Bridge87759
13.6 cm31 Aug 2005Bull Bridge87759
13.5 cm18 Oct 2007Bull Bridge108830
13.5 cm18 Oct 2007Bull Bridge108830
13.5 cm17 Jul 2001Alt Bridge90496
13.4 cm31 Aug 2005Bull Bridge87759

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
Alt Weir Upstream1 May 20261 May 20261
Alt Weir Downstream1 May 20261 May 20261
Homer Green19 Oct 201519 Oct 20151
Bull Bridge17 Jul 20018 Mar 20134
Alt Bridge4 Sept 199630 Aug 20053
Carr Houses4 Sept 19964 Sept 19961

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

1996–2026

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 150 measured fish were spread across different length ranges.

Smallest
4.5 cm
Lower quarter
9.1 cm
Median
11.1 cm
Upper quarter
12.5 cm
Largest
14.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Alt

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

Flounder Chub European eel Roach 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 →