Grayling · Thymallus thymallus

Grayling in the River Medway

Largest measured grayling: 31.8 cm

The largest grayling measured in Environment Agency surveys of the River Medway was 31.8 cm, recorded at Grom/Medway Confluence u/s on 9 October 2007.

Across 161 measured grayling, the median measured length was 10.4 cm.

Surveyors recorded weights for 4 grayling. The median was 5.5 oz (0.1555 kg) and the largest recorded weight was 8 oz (0.227 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 Medway.

See grayling records across England →

Most recent observation23 October 2025Hartfield · 2 fish

Largest measured grayling: 31.8 cm
Median length: 10.4 cm
Fish measured: 161
Survey locations: 5

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
31.8 cm	9 Oct 2007	Grom/Medway Confluence u/s	107274
29.9 cm	9 Oct 2007	Grom/Medway Confluence u/s	107274
29.7 cm	1 Sept 2016	Hartfield	149137
28.4 cm	6 Sept 2019	Hartfield	155322
28.2 cm	24 Aug 2017	Hartfield	151310
27.3 cm	9 Oct 2007	Grom/Medway Confluence u/s	107274
26.8 cm	8 Aug 2003	Hartfield	77836
26 cm	21 Jul 2009	Hartfield	119384
25.8 cm	24 Aug 2017	Hartfield	151310
25.5 cm	26 Aug 2021	Hartfield	160779

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
Hartfield	8 Aug 2003	23 Oct 2025	19
Fordcombe	10 Sept 2014	24 Oct 2018	2
Ashdown House Farm	11 Aug 2011	25 Aug 2016	2
Grom/Medway Confluence u/s	9 Oct 2007	9 Oct 2007	1
Gallypot	12 Apr 2004	3 Oct 2007	2

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

2003–2025

Survey records by year

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

103

204

105

006

307

108

109

110

211

012

113

214

115

216

117

218

119

020

121

122

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 161 measured fish were spread across different length ranges.

Smallest: 2.7 cm
Lower quarter: 9 cm
Median: 10.4 cm
Upper quarter: 18.8 cm
Largest: 31.8 cm

0–99 mm

100–199 mm

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 4 grayling. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.4 oz (0.011 kg)
Lower quarter: 2.6 oz (0.0725 kg)
Median: 5.5 oz (0.1555 kg)
Upper quarter: 7.8 oz (0.2202 kg)
Heaviest: 8 oz (0.227 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 Medway

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

Chub Gudgeon Roach Perch Bleak Dace

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 →