Grayling · Thymallus thymallus

Grayling in the River Derwent (Yorkshire)

Largest measured grayling: 47.6 cm

The largest grayling measured in Environment Agency surveys of the River Derwent (Yorkshire) was 47.6 cm, recorded at Howsham DERCORS8 on 16 July 2015.

Across 684 measured grayling, the median measured length was 18.1 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 Derwent (Yorkshire).

See grayling records across England →

Most recent observation17 August 2022Downstream Forge Valley gauging weir. DERBT5. · 3 fish

Largest measured grayling: 47.6 cm
Median length: 18.1 cm
Fish measured: 684
Survey locations: 14

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
47.6 cm	16 Jul 2015	Howsham DERCORS8	145494
41.8 cm	13 Jul 2009	Yedingham DERCORS4	118747
40.5 cm	10 Sept 2007	Yedingham DERCORS4	108115
37 cm	15 Sept 2009	Buttercrambe DERCORS9	119820
37 cm	21 Sept 2006	Stamford Bridge DERCORS10	107944
36.5 cm	24 Jul 2012	Kirkham Abbey DERCORS7	132633
35.5 cm	5 Sept 2001	Yedingham DERCORS4	24103
35.2 cm	23 Sept 2005	Stamford Bridge DERCORS10	87888
35.2 cm	6 Sept 2002	Stamford Bridge DERCORS10	72277
34.8 cm	9 Aug 2010	Yedingham DERCORS4	124864

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
Downstream Forge Valley gauging weir. DERBT5.	24 Sept 2001	17 Aug 2022	14
Downstream Weir Head DERBT3	24 Sept 2001	20 Sept 2018	12
Stamford Bridge DERCORS10	19 Sept 1997	16 Jul 2018	14
Yedingham DERCORS4	5 Sept 2001	25 Jun 2018	11
Kirkham Abbey DERCORS7	7 Sept 2001	21 Jun 2016	10
Buttercrambe DERCORS9	14 Sept 2001	21 Jul 2015	11
Howsham DERCORS8	12 Sept 2001	16 Jul 2015	10
Malton DERCORS5	5 Sept 2001	14 Jul 2015	11
Downstream Wrench Green Bridge.DERBT2	13 Sept 2012	13 Sept 2012	1
Sutton Upon Derwent DERCORS18	14 Sept 2009	14 Sept 2009	1
Upstream Wrench Green Bridge	21 Jun 2006	21 Jun 2006	1
Darrells Low Fm	21 Jun 2006	21 Jun 2006	1
Low Hutton DERCORS6	21 Sept 2005	21 Sept 2005	1
Downstream West Ayton DERBT6	30 Aug 2000	27 Aug 2003	4

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

1997–2022

Survey records by year

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

197

098

099

200

901

902

903

604

905

1006

807

108

709

610

211

812

213

214

515

116

017

318

019

020

121

122

Fish measured by surveyors

Measured length distribution

See how the 684 measured fish were spread across different length ranges.

Smallest: 1.5 cm
Lower quarter: 10.7 cm
Median: 18.1 cm
Upper quarter: 22.4 cm
Largest: 47.6 cm

0–99 mm

142

100–199 mm

298

200–299 mm

211

300–399 mm

400–499 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent (Yorkshire)

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

Minnow Bullhead Stone loach Dace European eel 3-spined stickleback

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 →