RiverFish

Grayling · Thymallus thymallus

Grayling in the River Bollin

Largest measured grayling: 31 cm

The largest grayling measured in Environment Agency surveys of the River Bollin was 31 cm, recorded at Bobo12 on 14 September 2022.

Across 18 measured grayling, the median measured length was 21.9 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 Bollin.

See grayling records across England →

Most recent observation23 July 2025Bobo19 · 1 fish
Largest measured grayling
31 cm
Median length
21.9 cm
Fish measured
18
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
31 cm14 Sept 2022Bobo12161993
30.5 cm14 Sept 2022Bobo12161993
30.2 cm14 Sept 2022Bobo12161993
30 cm3 Nov 1993Bo2456433
28.3 cm14 Sept 2022Bobo12161993
26.1 cm14 Sept 2022Bobo12161993
23.9 cm14 Sept 2022Bobo12161993
22 cm14 Sept 2022Bobo12161993
22 cm14 Sept 2022Bobo12161993
21.8 cm14 Sept 2022Bobo12161993

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
Bobo1923 Jul 202523 Jul 20251
Bobo1214 Sept 202222 Jul 20252
Mc0520 Sept 202220 Sept 20221
Bo243 Nov 19933 Nov 19931

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

1993–2025

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 18 measured fish were spread across different length ranges.

Smallest
8.5 cm
Lower quarter
20.1 cm
Median
21.9 cm
Upper quarter
27.8 cm
Largest
31 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Bollin

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

Stone loach 3-spined stickleback Bullhead Gudgeon Brown / sea trout Chub

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 →