RiverFish

Grayling · Thymallus thymallus

Grayling in the River Witham

Largest measured grayling: 38.1 cm

The largest grayling measured in Environment Agency surveys of the River Witham was 38.1 cm, recorded at Sleeper Bridge (Witham) on 10 September 2014.

Across 714 measured grayling, the median measured length was 18 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 Witham.

See grayling records across England →

Most recent observation13 November 2025Queen Elizabeth Park · 12 fish
Largest measured grayling
38.1 cm
Median length
18 cm
Fish measured
714
Survey locations
10

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
38.1 cm10 Sept 2014Sleeper Bridge (Witham)142808
36.4 cm12 Oct 2007Sleeper Bridge (Witham)107388
35.5 cm22 Apr 2005Sleeper Bridge (Witham)84493
34 cm24 Apr 2006Sleeper Bridge (Witham)90929
33.5 cm8 May 2002Upstream Foston Ford59067
32.8 cm10 Sept 2014Sleeper Bridge (Witham)142808
32.8 cm25 Sept 1985Barkston Bridge52994
32.6 cm23 Apr 2004A607 Road Bridge79727
32.4 cm13 Nov 2025Wyndom Park180036
32.3 cm13 Nov 2025Queen Elizabeth Park180038

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
Wyndom Park13 Nov 202513 Nov 20251
Queen Elizabeth Park13 Nov 202513 Nov 20251
Marston Bridge8 Mar 19885 Nov 20256
Upstream Syston Weir26 Sept 198524 Aug 20238
Sleeper Bridge (Witham)6 Sept 198522 Aug 202316
Upstream Foston Ford8 May 200225 Apr 20179
Claypole Bridge28 Apr 200923 Apr 20102
A607 Road Bridge4 Mar 198823 Apr 20044
Barkston Bridge25 Sept 19857 Mar 19882
Upstream Elinors Weir23 Sept 19851 Mar 19882

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

1985–2025

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 714 measured fish were spread across different length ranges.

Smallest
7.9 cm
Lower quarter
15.4 cm
Median
18 cm
Upper quarter
23.2 cm
Largest
38.1 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Witham

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

Dace Roach Gudgeon European eel Perch Pike

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 →