RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Medway

Largest measured gudgeon: 18.9 cm

The largest gudgeon measured in Environment Agency surveys of the River Medway was 18.9 cm, recorded at D/s Ashurst Road Bridge on 13 September 2022.

Across 4,541 measured gudgeon, the median measured length was 8.3 cm.

Surveyors recorded weights for 83 gudgeon. The median was 0.6 oz (0.018 kg) and the largest recorded weight was 1.4 oz (0.041 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 Medway.

See gudgeon records across England →

Most recent observation21 July 2026Sovereign Way Tonbridge · 12 fish
Largest measured gudgeon
18.9 cm
Median length
8.3 cm
Fish measured
4,541
Survey locations
22

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
18.9 cm13 Sept 2022D/s Ashurst Road Bridge161916
18.5 cm18 Aug 2009Teston119394
18.3 cm4 Aug 2009Penshurst119376
16.8 cm19 Oct 2005D/s Weirwood Reservoir87479
16.7 cm12 May 2008D/s Weirwood Reservoir114616
16.4 cm15 Oct 2025Fordcombe180381
16.4 cm21 Aug 2019D/s Weirwood Reservoir155185
16.4 cm4 Sept 2006D/s Weirwood Reservoir103365
16.3 cm27 Jul 2006Hartfield103262
16.2 cm9 Aug 2012Penshurst132730

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
Sovereign Way Tonbridge1 Sept 201021 Jul 202615
Tovil16 Nov 200615 Jul 202610
Hartfield23 Aug 200123 Oct 202524
Penshurst22 Nov 200116 Oct 202522
Fordcombe14 Nov 200115 Oct 202520
D/s Ashurst Road Bridge29 Jul 200218 Sept 202520
D/s Weirwood Reservoir19 Jul 20019 Sept 202518
Golden Green24 Jul 200830 Jul 20259
Tonbridge Juvenile Fish Seine Netting Survey20 Jul 201228 May 202517
Maidstone Juvenile Fish Seine Netting Survey20 Jul 201228 May 202516
Hampstead Lock Juvenile Fish Seine Netting Survey15 Jun 201828 May 202510
Teston18 Aug 20093 Sept 20246
Yalding Leas27 Sept 20048 Aug 20195
Ashdown House Farm11 Aug 201125 Aug 20162
Yalding Juvenile Fish Seine Netting Survey21 Sept 20128 Aug 20166
Tonbridge Juvenile Fish Kick Sampling Survey21 Aug 201521 Aug 20151
Maidstone Juvenile Fish Kick Sampling Survey30 Aug 201230 Aug 20121
Bewleys Weir23 Sept 20023 Sept 20097
Grom/Medway Confluence u/s9 Oct 20079 Oct 20071
Grom/Medway Confluence d/s9 Oct 20079 Oct 20071
Gallypot12 Apr 20043 Oct 20072
Ham Farm25 Sept 200225 Sept 20021

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

2001–2026

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 4,541 measured fish were spread across different length ranges.

Smallest
0.7 cm
Lower quarter
3.8 cm
Median
8.3 cm
Upper quarter
10.6 cm
Largest
18.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 83 gudgeon. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.004 kg)
Lower quarter
0.4 oz (0.012 kg)
Median
0.6 oz (0.018 kg)
Upper quarter
0.8 oz (0.022 kg)
Heaviest
1.4 oz (0.041 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 Medway

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

Chub Roach Perch Bleak Dace Minnow

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 →