RiverFish

Grayling · Thymallus thymallus

Grayling in the River Gwash

Largest measured grayling: 55.6 cm

The largest grayling measured in Environment Agency surveys of the River Gwash was 55.6 cm, recorded at Belmesthorpe Meadow on 24 June 2013.

Across 491 measured grayling, the median measured length was 21.6 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 Gwash.

See grayling records across England →

Most recent observation17 August 2023Foundry Road · 14 fish
Largest measured grayling
55.6 cm
Median length
21.6 cm
Fish measured
491
Survey locations
12

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
55.6 cm24 Jun 2013Belmesthorpe Meadow137453
37.5 cm17 Apr 2003Friths Farm78277
36 cm12 Sept 2018Flow Project - Upstream Gt. Casterton STW153493
35.2 cm30 Sept 2016Foundry Road150083
35.1 cm26 Nov 2007Friths Farm108688
34.6 cm30 Sept 2016Foundry Road150083
34.1 cm26 Nov 2007Upstream White Post Bridge108691
34 cm30 Sept 2016Belmesthorpe Meadow150080
34 cm4 Jun 2014Belmesthorpe Meadow141010
33.8 cm26 Nov 2007Friths Farm108688

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
Foundry Road2 Mar 199317 Aug 202312
Flow Project - Upstream Gt. Casterton STW2 Nov 201512 Sept 20183
Upstream White Post Bridge31 Jul 200610 Sept 20188
Belmesthorpe Meadow12 Mar 199025 Sept 20179
Great Casterton28 Mar 199618 Jun 20152
Flow Project - DS Great Casterton STW15 May 201515 May 20151
Upstream Ryhall STW - Flow project Site14 May 201514 May 20151
Downstream Ryhall STW Flow project site14 May 201514 May 20151
Ingthorpe27 Nov 200716 Jun 20144
Downstream Ingthorpe Road Bridge20 Mar 199625 Jun 20132
Friths Farm13 Mar 199026 Nov 20075
Shacklewell Lodge Ingthorpe3 Mar 19933 Mar 19931

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

1990–2023

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 491 measured fish were spread across different length ranges.

Smallest
5 cm
Lower quarter
18.6 cm
Median
21.6 cm
Upper quarter
25.8 cm
Largest
55.6 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Gwash

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

Brown / sea trout European eel Bullhead Dace Roach Perch

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 →