RiverFish

Grayling · Thymallus thymallus

Grayling in the River Swale

Largest measured grayling: 40.8 cm

The largest grayling measured in Environment Agency surveys of the River Swale was 40.8 cm, recorded at Holme on 1 August 2005.

Across 1,015 measured grayling, the median measured length was 19.5 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 grayling records across England →

Most recent observation27 July 2026Great Langton DS of midbar · 1 fish
Largest measured grayling
40.8 cm
Median length
19.5 cm
Fish measured
1,015
Survey locations
25

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
40.8 cm1 Aug 2005Holme85855
40 cm3 Aug 1995Langton Bridge110461
38.1 cm3 Aug 1995Brompton-on-Swale, Thornborough Farm110460
36.8 cm7 Aug 2003Brompton-on-Swale, Thornborough Farm77809
36.3 cm27 Jul 2005Brompton-on-Swale, Thornborough Farm85874
35.8 cm7 Aug 2003Brompton-on-Swale, Thornborough Farm77809
35.7 cm2 Aug 2007Brompton-on-Swale, Thornborough Farm106475
35.7 cm26 Jul 2002Kiplin55330
35.6 cm8 Aug 2005Ellerton86914
35.6 cm4 Aug 2005Kiplin85872

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
Great Langton DS of midbar27 Jul 202627 Jul 20261
Skipton-on-Swale25 Jul 19967 Aug 202513
Maunby Demesne Upper Site14 Aug 200230 Jul 202514
Brafferton11 Sept 200030 Jul 202516
Maunby - Fry Survey12 Sept 201217 Aug 20234
Myton Grange8 Sept 20046 Jul 20223
Morton-on-Swale15 Aug 20003 Aug 20107
Leckby24 Jul 20022 Jul 20105
Brompton-on-Swale, Thornborough Farm3 Aug 19952 Aug 20077
Langton Bridge3 Aug 199531 Jul 20077
Ellerton8 Aug 20058 Aug 20051
Colburn (Broken Brae Caravan Park)8 Aug 20058 Aug 20051
Tancred Grange4 Aug 20054 Aug 20051
Swalefields4 Aug 20054 Aug 20051
Kiplin26 Jul 20024 Aug 20052
Langton Grange3 Aug 20053 Aug 20051
Holme25 Jun 19961 Aug 20053
Topcliffe Caravan Park23 Jul 200228 Jul 20052
Maunby Railway Bridge28 Jul 200528 Jul 20051
Richmond27 Jul 200527 Jul 20051
Far Fairholme25 Jul 200226 Jul 20052
Fawdington23 Jul 200221 Jul 20052
Thornton Bridge20 Jul 200520 Jul 20051
Catterick9 Aug 20029 Aug 20021
Maunby Demesne26 Jun 199626 Jun 19961

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

1995–2026

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 1,015 measured fish were spread across different length ranges.

Smallest
1.1 cm
Lower quarter
9.3 cm
Median
19.5 cm
Upper quarter
24.8 cm
Largest
40.8 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 Barbel

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 →