Grayling · Thymallus thymallus

Grayling in the Main River Chew

Largest measured grayling: 34.3 cm

The largest grayling measured in Environment Agency surveys of the Main River Chew was 34.3 cm, recorded at Pensford (Te) on 16 July 2019.

Across 152 measured grayling, the median measured length was 22.1 cm.

Surveyors recorded weights for 101 grayling. The median was 4 oz (0.114 kg) and the largest recorded weight was 15.1 oz (0.429 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 Chew.

See grayling records across England →

Most recent observation6 July 2023Pensford (Te) · 5 fish

Largest measured grayling: 34.3 cm
Median length: 22.1 cm
Fish measured: 152
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.

Length	Survey date	Survey location	Survey ID
34.3 cm	16 Jul 2019	Pensford (Te)	154790
31.5 cm	9 Aug 2006	Pensford (Te)	100829
30.8 cm	16 Jul 2019	Pensford (Te)	154790
30 cm	7 Jul 2016	Compton Dando (Te)	148399
30 cm	26 Aug 2008	Compton Dando (Te)	113495
29.5 cm	6 Jul 2023	Pensford (Te)	162500
29.5 cm	29 Jun 2005	Pensford (Te)	84951
29.3 cm	9 Aug 2006	Pensford (Te)	100829
29.1 cm	26 Aug 2008	Compton Dando (Te)	113495
29 cm	10 Aug 2007	Compton Dando (Te)	106296

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 surveyed	First recorded	Last recorded	Visits finding grayling
Pensford (Te)	15 May 2002	6 Jul 2023	10
Compton Dando (Te)	20 Jun 2003	27 Jun 2023	9
Chewton Keynsham	4 Sept 2007	4 Sept 2007	1

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

2002–2023

Survey records by year

Each bar shows how many survey visits recorded grayling that year.

102

203

204

205

206

307

208

009

010

011

012

013

014

015

216

017

018

219

020

021

022

223

Fish measured by surveyors

Measured length distribution

See how the 152 measured fish were spread across different length ranges.

Smallest: 6.7 cm
Lower quarter: 19.5 cm
Median: 22.2 cm
Upper quarter: 25.6 cm
Largest: 34.3 cm

0–99 mm

100–199 mm

200–299 mm

101

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 101 grayling. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.4 oz (0.012 kg)
Lower quarter: 2.9 oz (0.083 kg)
Median: 4 oz (0.114 kg)
Upper quarter: 6.2 oz (0.177 kg)
Heaviest: 15.1 oz (0.429 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 Chew

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

Bullhead Roach Minnow Stone loach Brown / sea trout European eel

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 →