RiverFish

Grayling · Thymallus thymallus

Grayling in the Main River Tone

Largest measured grayling: 35.5 cm

The largest grayling measured in Environment Agency surveys of the Main River Tone was 35.5 cm, recorded at Hornshay Farm at Nynehead (Se-03) on 7 June 2007.

Across 466 measured grayling, the median measured length was 20 cm.

Surveyors recorded weights for 214 grayling. The median was 3.3 oz (0.093 kg) and the largest recorded weight was 1 lb 4.7 oz (0.586 kg).

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

See grayling records across England →

Most recent observation30 September 2025Roughmoor (Te) · 3 fish
Largest measured grayling
35.5 cm
Median length
20 cm
Fish measured
466
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
35.5 cm7 Jun 2007Hornshay Farm at Nynehead (Se-03)105466
35.4 cm1 Sept 1994Trefusis Farm79715
34.4 cm7 Jun 2007Hornshay Farm at Nynehead (Se-03)105466
33.3 cm27 May 2010Ash Farm (Salmon Project)122305
32.8 cm30 Sept 2025Roughmoor (Te)179891
32.8 cm7 Jun 2007Hornshay Farm at Nynehead (Se-03)105466
32.5 cm19 Sept 2024Bathpool167170
32.5 cm21 May 2008Bradford on Tone111456
32.3 cm1 Sept 2009Bathpool118807
32.3 cm7 Jun 2007Hornshay Farm at Nynehead (Se-03)105466

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
Roughmoor (Te)9 Oct 200330 Sept 202510
Bathpool12 Sept 200619 Sept 20249
Ash Farm (Salmon Project)9 May 200716 Aug 20188
Bradford on Tone21 May 200818 Jun 20142
Priorswood (Te)11 Sept 20037 Oct 20096
Hornshay Farm at Nynehead (Se-03)9 Sept 19947 Jun 20073
Parsonage Farm (Te)22 Sept 20034 Aug 20064
Downstream Nynehead Weir (Salmon Project)1 Jun 20061 Jun 20061
Trefusis Farm1 Sept 19941 Sept 19941
Hele Hill31 Aug 199431 Aug 19941

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

1994–2025

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 466 measured fish were spread across different length ranges.

Smallest
3.6 cm
Lower quarter
17.2 cm
Median
20 cm
Upper quarter
24.3 cm
Largest
35.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 214 grayling. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.1 oz (0.003 kg)
Lower quarter
2 oz (0.058 kg)
Median
3.3 oz (0.093 kg)
Upper quarter
5.9 oz (0.168 kg)
Heaviest
1 lb 4.7 oz (0.586 kg)

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

More fish in this river

Explore the Main River Tone

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

Brown / sea trout Bullhead European eel Stone loach Minnow 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 →