RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Mole

Largest measured gudgeon: 18.9 cm

The largest gudgeon measured in Environment Agency surveys of the River Mole was 18.9 cm, recorded at Old Mole Channel on 20 June 1986.

Across 6,253 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 Mole.

See gudgeon records across England →

Most recent observation29 July 2025Castlefields · 44 fish
Largest measured gudgeon
18.9 cm
Median length
9.4 cm
Fish measured
6,253
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 cm20 Jun 1986Old Mole Channel103266
17.6 cm20 Sept 2012Meath Green Farm, Horley133762
17.5 cm22 Aug 2002Meath Green Farm, Horley64940
16.8 cm2 Oct 2003Box Hill77688
16.6 cm30 Sept 2015Meath Green Farm, Horley146801
16.6 cm19 Oct 2005Below Downside Bridge, Cobham.87637
15.8 cm14 Nov 2017Horley Swimming Baths156435
15.8 cm19 Sept 1985Upstream Horley STW103348
14.8 cm17 Sept 2003Downstream Gatwick77165
14.6 cm17 Sept 2003Downstream Gatwick77165

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
Castlefields29 Jul 202529 Jul 20251
Norbury Park, Near Mickleham16 Feb 199317 Jul 20257
Downstream Gatwick17 Sept 19859 Jul 202510
Downstream Painshill23 Oct 20073 Jul 20258
Downstream Downside Mill25 Feb 199324 Jun 20256
Horley Swimming Baths17 Jul 199214 Nov 20176
Box Hill11 Feb 199320 Oct 201511
Meath Green Farm, Horley1 Oct 199230 Sept 201513
Flanchford Farm5 Sept 200217 Sept 20135
Old Mole Channel20 Jun 198617 Oct 20127
Below Downside Bridge, Cobham.14 Nov 198519 Oct 20054
Randalls Road, Leatherhead7 Nov 20037 Nov 20031
Povey Cross Enhancement Scheme20 Aug 200220 Aug 20021
Norwood Farm Downstream Cobham9 Mar 19939 Mar 19931
Upstream Brockham Bridge4 Feb 19934 Feb 19931
Upstream Betchworth Weir15 Oct 199215 Oct 19921
Upstream Sidlow Bridge18 May 198918 May 19891
Upstream Horley STW19 Sept 198516 May 19892
Upstream M25 at Stoke D'Abernon (Left Arm)23 Oct 198623 Oct 19861
Upstream M25 at Stoke D'Abernon (Right Arm)22 Oct 198522 Oct 19851
Downstream Brockham Bridge8 Oct 19858 Oct 19851
Burys Court School, Upstream Flanchford Bridge1 Oct 19851 Oct 19851

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

1985–2025

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 6,253 measured fish were spread across different length ranges.

Smallest
0.9 cm
Lower quarter
7.8 cm
Median
9.4 cm
Upper quarter
10.6 cm
Largest
18.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Mole

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

Roach Dace Chub Minnow Stone loach 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 →