RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Wandle

Largest measured gudgeon: 18.1 cm

The largest gudgeon measured in Environment Agency surveys of the River Wandle was 18.1 cm, recorded at Sainsburys Merton on 1 July 2015.

Across 1,089 measured gudgeon, the median measured length was 13.2 cm.

Surveyors recorded weights for 52 gudgeon. The median was 0.9 oz (0.025 kg) and the largest recorded weight was 2.4 oz (0.068 kg).

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

See gudgeon records across England →

Most recent observation8 October 2025Watermeads Lane · 64 fish
Largest measured gudgeon
18.1 cm
Median length
13.2 cm
Fish measured
1,089
Survey locations
11

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
18.1 cm1 Jul 2015Sainsburys Merton145446
18 cm23 Jun 2015Watermeads Lane145180
17.9 cm17 Jul 1997North road, Colliers Wood116861
17.6 cm1 Jul 2015Sainsburys Merton145446
17.6 cm1 Jul 2015Sainsburys Merton145446
17.6 cm1 Jul 2015Sainsburys Merton145446
17.6 cm17 Jul 1997North road, Colliers Wood116861
17.5 cm1 Oct 2025Sainsburys Merton180360
17.5 cm12 Jun 2009Sainsburys Merton117520
17.2 cm1 Jul 2015Sainsburys Merton145446

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
Watermeads Lane17 Jun 20098 Oct 20257
Mapleton Road18 Jun 20097 Oct 20257
Waterside Way15 Jun 20092 Oct 20255
Sainsburys Merton12 Jun 20091 Oct 20257
Ravensbury Park22 Jul 198830 Sept 20259
Phipps Bridge12 Jun 200926 Jun 20195
Trewint Street - Weir Road9 Jun 201130 Jun 20153
King George Park26 Apr 199411 Jun 20137
Hackbridge21 Jul 198812 May 20042
North road, Colliers Wood27 Jul 198917 Jul 19973
Goat Bridge, Beddington22 Jul 198822 Jul 19881

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

1988–2025

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 1,089 measured fish were spread across different length ranges.

Smallest
3.2 cm
Lower quarter
12 cm
Median
13.2 cm
Upper quarter
14.6 cm
Largest
18.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 52 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.4 oz (0.01 kg)
Lower quarter
0.7 oz (0.0208 kg)
Median
0.9 oz (0.025 kg)
Upper quarter
1.1 oz (0.0322 kg)
Heaviest
2.4 oz (0.068 kg)

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

More fish in this river

Explore the River Wandle

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

3-spined stickleback Stone loach European eel Chub Roach Dace

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 →