RiverFish

Grayling · Thymallus thymallus

Grayling in the River Lee

Largest measured grayling: 34 cm

The largest grayling measured in Environment Agency surveys of the River Lee was 34 cm, recorded at Amwell Loop on 23 July 2026.

Across 58 measured grayling, the median measured length was 22.1 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 Lee.

See grayling records across England →

Most recent observation23 July 2026Amwell Loop · 19 fish
Largest measured grayling
34 cm
Median length
22.1 cm
Fish measured
58
Survey locations
4

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
34 cm23 Jul 2026Amwell Loop182253
31.5 cm23 Jul 2026Amwell Loop182253
31.5 cm15 Jul 2025Amwell Loop177652
31 cm15 Jul 2025Amwell Loop177652
30 cm15 Jul 2025Amwell Loop177652
27 cm23 Jul 2026Amwell Loop182253
26.6 cm22 Sept 2004Amwell Loop82419
25.5 cm15 Sept 2005Waterdale86595
25.5 cm22 Sept 2004Amwell Loop82419
25.2 cm23 Jul 2026Amwell Loop182253

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
Amwell Loop19 Sept 200323 Jul 20264
Waterdale16 Sept 200431 Jul 20253
Hartham Leisure centre24 Jun 201924 Jun 20191
Wheathampstead17 Aug 201030 Jul 20133

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

2003–2026

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 58 measured fish were spread across different length ranges.

Smallest
7.2 cm
Lower quarter
19.9 cm
Median
22.2 cm
Upper quarter
24 cm
Largest
34 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Lee

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

Roach Perch Gudgeon Minnow Chub 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 →