RiverFish

Grayling · Thymallus thymallus

Grayling in the River Chess

Largest measured grayling: 32.8 cm

The largest grayling measured in Environment Agency surveys of the River Chess was 32.8 cm, recorded at Mountwood Ford on 7 October 2025.

Across 96 measured grayling, the median measured length was 19.9 cm.

Surveyors recorded weights for 11 grayling. The median was 1.2 oz (0.033 kg) and the largest recorded weight was 7.9 oz (0.225 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the River Chess.

See grayling records across England →

Most recent observation7 October 2025Mountwood Ford · 13 fish
Largest measured grayling
32.8 cm
Median length
19.9 cm
Fish measured
96
Survey locations
7

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
32.8 cm7 Oct 2025Mountwood Ford179252
31.2 cm7 Oct 2025Mountwood Ford179252
31.1 cm7 Oct 2025Mountwood Ford179252
30.8 cm7 Oct 2025Mountwood Ford179252
29.9 cm7 Oct 2025Mountwood Ford179252
29.5 cm7 Oct 2025Mountwood Ford179252
29.4 cm7 Oct 2025Mountwood Ford179252
29.3 cm7 Oct 2025Mountwood Ford179252
28.9 cm7 Oct 2025Mountwood Ford179252
28.7 cm5 Oct 2023Mountwood Ford163536

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
Mountwood Ford15 May 20077 Oct 20258
Solesbridge nursery22 Sept 202222 Sept 20221
Little Chess Restore Hope26 Apr 202226 Apr 20221
Sarratt Bottom7 Jul 20067 Jul 20061
Scotts Bridge15 Dec 198715 Dec 19871
Sarratt Mill3 Dec 19873 Dec 19871
Loudwater Lane (Masonic Lodge)24 Nov 198724 Nov 19871

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

1987–2025

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 96 measured fish were spread across different length ranges.

Smallest
10 cm
Lower quarter
13.7 cm
Median
20 cm
Upper quarter
25 cm
Largest
32.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 11 grayling. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.5 oz (0.015 kg)
Lower quarter
0.6 oz (0.0165 kg)
Median
1.2 oz (0.033 kg)
Upper quarter
5 oz (0.142 kg)
Heaviest
7.9 oz (0.225 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Chess

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

Brown / sea trout Bullhead Stone loach Minnow 3-spined stickleback Atlantic salmon

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 →