RiverFish

Grayling · Thymallus thymallus

Grayling in the River Blyth

Largest measured grayling: 21.5 cm

The largest grayling measured in Environment Agency surveys of the River Blyth was 21.5 cm, recorded at River Blyth at Plessey Farm on 2 August 2012.

Across 19 measured grayling, the median measured length was 8.2 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 Blyth.

See grayling records across England →

Most recent observation24 July 2024River Blyth at Humford Mill · 3 fish
Largest measured grayling
21.5 cm
Median length
8.2 cm
Fish measured
19
Survey locations
3

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
21.5 cm2 Aug 2012River Blyth at Plessey Farm132590
21 cm2 Aug 2012River Blyth at Plessey Farm132590
19.7 cm24 Jul 2024River Blyth at Humford Mill167551
19.4 cm24 Jul 2024River Blyth at Humford Mill167551
16.1 cm2 Aug 2012River Blyth at Humford Mill132589
9 cm30 Jul 2009River Blyth at Humford Mill119737
8.7 cm26 Jul 2013River Blyth at Plessey Farm137456
8.5 cm24 Jul 2024River Blyth at Humford Mill167551
8.2 cm26 Jul 2013River Blyth at Plessey Farm137456
8.2 cm26 Jul 2013River Blyth at Humford Mill137455

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
River Blyth at Humford Mill17 Aug 200724 Jul 20246
River Blyth at Plessey Farm2 Aug 20108 Jun 20225
River Blyth at Thornyford27 Jun 201627 Jun 20161

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

2007–2024

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 19 measured fish were spread across different length ranges.

Smallest
4.9 cm
Lower quarter
7.8 cm
Median
8.2 cm
Upper quarter
12.6 cm
Largest
21.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Blyth

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

Stone loach Brown / sea trout Minnow 3-spined stickleback European eel Gudgeon

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 →