RiverFish

Gudgeon · Gobio gobio

Gudgeon in the River Nidd

Largest measured gudgeon: 18.7 cm

The largest gudgeon measured in Environment Agency surveys of the River Nidd was 18.7 cm, recorded at Knaresborough Bypass on 5 July 2011.

Across 1,468 measured gudgeon, the median measured length was 8.3 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 Nidd.

See gudgeon records across England →

Most recent observation17 July 2025Moor Monkton · 1 fish
Largest measured gudgeon
18.7 cm
Median length
8.3 cm
Fish measured
1,468
Survey locations
13

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
18.7 cm5 Jul 2011Knaresborough Bypass127090
14.5 cm3 Jul 2014Knaresborough Bypass141544
14.3 cm18 Jul 2014Nun Monkton141763
14 cm28 Aug 2003Cowthorpe78460
13.9 cm23 Aug 2002Cowthorpe68200
13.8 cm28 Aug 2003Cowthorpe78460
13.6 cm21 Jun 2022Cowthorpe161163
13.6 cm19 Jul 2018Cowthorpe152891
13.6 cm13 Jul 2010Cowthorpe122973
13.5 cm3 Aug 2004Cowthorpe82047

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
Moor Monkton27 Jun 202217 Jul 20252
Knaresborough Bypass22 Aug 20029 Jul 202517
Cowthorpe23 Aug 20027 Jul 202518
Skip Bridge16 Jul 202423 Jun 20252
Kirk Hammerton - Fry Survey20 Sept 198414 Aug 202424
Ribston Park (NEW 2018)3 Jul 201918 Jul 20243
Ribston Park22 Aug 20023 Jul 201913
Nun Monkton21 Aug 200218 Jul 201712
Kirk Hammerton21 Aug 200223 Jun 201612
Conyngham Hall28 Sept 201528 Sept 20151
Goldsborough22 Jul 201522 Jul 20151
Scotton Mill14 Jun 200514 Jun 20051
u/s Hampsthwaite Bridge9 Jun 20059 Jun 20051

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 1,468 measured fish were spread across different length ranges.

Smallest
2 cm
Lower quarter
6.2 cm
Median
8.3 cm
Upper quarter
10.2 cm
Largest
18.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Nidd

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

Minnow Bullhead Stone loach Grayling Brown / sea trout European eel

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 →