RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Swale

Largest measured gudgeon: 15.8 cm

The largest gudgeon measured in Environment Agency surveys of the River Swale was 15.8 cm, recorded at Brafferton on 10 August 2002.

Across 987 measured gudgeon, the median measured length was 7.3 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 Swale.

See gudgeon records across England →

Most recent observation13 August 2025Maunby - Fry Survey · 450 fish
Largest measured gudgeon
15.8 cm
Median length
7.3 cm
Fish measured
987
Survey locations
19

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
15.8 cm10 Aug 2002Brafferton55056
13.8 cm8 Jul 2014Maunby Demesne Upper Site141651
13.8 cm1 Aug 1996Brafferton110454
13.7 cm31 Jul 2007Morton-on-Swale106471
13.7 cm9 Aug 2006Morton-on-Swale101078
13.5 cm15 Aug 2000Morton-on-Swale25696
13 cm2 Jul 2015Brafferton145343
13 cm2 Jul 2015Brafferton145343
13 cm9 Aug 2006Morton-on-Swale101078
12.9 cm10 Aug 2002Brafferton55056

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
Maunby - Fry Survey19 Sept 199613 Aug 202514
Skipton-on-Swale10 Aug 19957 Aug 20259
Brafferton1 Aug 199630 Jul 202517
Myton Grange15 Aug 200224 Jul 202512
Maunby Demesne Upper Site14 Aug 200222 Jul 202412
Morton-on-Swale15 Aug 200031 Jul 20075
Langton Bridge10 Aug 200031 Jul 20072
Thornton Bridge - Fry Survey20 Sept 198420 Sept 200617
Baldersby14 Aug 20022 Aug 20052
Holme25 Jun 19961 Aug 20052
Danotty Hall1 Aug 20051 Aug 20051
Topcliffe Caravan Park23 Jul 200228 Jul 20052
Fawdington23 Jul 200221 Jul 20052
Thornton Bridge20 Jul 200520 Jul 20051
Leckby24 Jul 200224 Jul 20021
d/s Wiske22 Jul 199722 Jul 19971
Catton22 Jul 199722 Jul 19971
Skipton - Fry Survey19 Sept 199619 Sept 19961
Maunby Demesne9 Aug 199526 Jun 19962

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

1984–2025

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 987 measured fish were spread across different length ranges.

Smallest
1 cm
Lower quarter
4.3 cm
Median
7.3 cm
Upper quarter
9.6 cm
Largest
15.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Swale

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

Minnow Chub Bullhead Stone loach Dace Grayling

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 →