RiverFish

Grayling · Thymallus thymallus

Grayling in the River Nidd

Largest measured grayling: 37.9 cm

The largest grayling measured in Environment Agency surveys of the River Nidd was 37.9 cm, recorded at Ribston Park (NEW 2018) on 30 June 2022.

Across 1,652 measured grayling, the median measured length was 15.7 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 grayling records across England →

Most recent observation8 July 2025Ribston Park (NEW 2018) · 5 fish
Largest measured grayling
37.9 cm
Median length
15.7 cm
Fish measured
1,652
Survey locations
17

Individual EA measurements

Largest measured grayling

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
37.9 cm30 Jun 2022Ribston Park (NEW 2018)161175
37.3 cm15 Jul 2009Knaresborough Bypass118562
37.1 cm9 Jun 2005u/s Hampsthwaite Bridge87920
35.3 cm12 Jun 2008Scotton Mill111301
35.3 cm23 Aug 2007Cowthorpe109825
35.2 cm23 Aug 2007Cowthorpe109825
33.9 cm23 Aug 2007Cowthorpe109825
33.8 cm4 Aug 2011Cowthorpe128668
33.7 cm12 Jun 2008u/s Hampsthwaite Bridge111303
33.7 cm12 Jun 2008Scotton Mill111301

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where grayling were found

Each point marks a survey location with at least one grayling 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 grayling
Ribston Park (NEW 2018)3 Jul 20198 Jul 20254
Cowthorpe23 Aug 20027 Jul 202519
Scotton Mill14 Jun 200512 Sept 20245
Summerbridge9 Jun 20054 Sept 20244
Ribston Park22 Aug 20023 Jul 201915
Knaresborough Bypass22 Aug 200218 Jul 201814
Kirk Hammerton21 Aug 200223 Jun 201613
Conyngham Hall28 Sept 201528 Sept 20151
u/s Hampsthwaite Bridge9 Jun 20057 Sept 20153
Birstwith13 Jun 20057 Sept 20153
Goldsborough22 Jul 201522 Jul 20151
Kirk Hammerton - Fry Survey15 Aug 201315 Aug 20131
Nun Monkton8 Jul 20108 Jul 20101
Lofthouse d/s19 Sept 200130 Oct 20085
Killinghall14 Jun 200514 Jun 20051
u/s Pately Bridge30 Oct 200113 Jun 20052
d/s Glasshouse WTW13 Jun 200513 Jun 20051

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

2001–2025

Survey records by year

Each bar shows how many survey visits recorded grayling that year.

Fish measured by surveyors

Measured length distribution

See how the 1,652 measured fish were spread across different length ranges.

Smallest
4.2 cm
Lower quarter
9.2 cm
Median
15.7 cm
Upper quarter
21.2 cm
Largest
37.9 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 Brown / sea trout European eel Gudgeon

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 →