RiverFish

Grayling · Thymallus thymallus

Grayling in the River Derwent

Largest measured grayling: 32.4 cm

The largest grayling measured in Environment Agency surveys of the River Derwent was 32.4 cm, recorded at River Derwent at Rowlands Gill on 18 August 2017.

Across 88 measured grayling, the median measured length was 9.5 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.

See grayling records across England →

Most recent observation14 July 2025River Derwent at Cricket Club · 6 fish
Largest measured grayling
32.4 cm
Median length
9.5 cm
Fish measured
88
Survey locations
8

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
32.4 cm18 Aug 2017River Derwent at Rowlands Gill151260
31.2 cm18 Aug 2017River Derwent at Rowlands Gill151260
30.7 cm26 Aug 2013River Derwent at Rowlands Gill138120
15 cm11 Oct 2016River Derwent at Blackhall Mill149638
14.5 cm11 Oct 2016River Derwent at Blackhall Mill149638
14.3 cm11 Oct 2016River Derwent at Rowlands Gill149640
14.2 cm11 Oct 2016River Derwent at Rowlands Gill149640
13.5 cm26 Aug 2013River Derwent at Hag Hill138119
13 cm3 Sept 2014River Derwent at Rowlands Gill142500
12.9 cm26 Sept 2015River Derwent at Allensford146761

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 Derwent at Shotley Bridge31 Jul 201314 Jul 20256
River Derwent at Cricket Club20 Aug 200714 Jul 20253
River Derwent at Allensford7 Aug 201030 Jun 20237
River Derwent at Rowlands Gill21 Aug 20079 Sept 20196
River Derwent at Hag Hill26 Aug 201318 Aug 20174
River Derwent at Lintzford3 Sept 201417 Aug 20172
River Derwent at Blackhall Mill14 Aug 200711 Oct 20163
River Derwent at Ebchester Bridge2 Sept 200926 Sept 20152

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

2007–2025

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 88 measured fish were spread across different length ranges.

Smallest
5.4 cm
Lower quarter
8.3 cm
Median
9.5 cm
Upper quarter
11.4 cm
Largest
32.4 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent

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

Brown / sea trout Minnow Bullhead Stone loach European eel 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 →