Grayling · Thymallus thymallus

Grayling in the Yedingham (Straightened Derwent project)

Largest measured grayling: 20.3 cm

The largest grayling measured in Environment Agency surveys of the Yedingham (Straightened Derwent project) was 20.3 cm, recorded at Net 11 on 18 August 2016.

Across 5 measured grayling, the median measured length was 10 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Yedingham (Straightened Derwent project).

See grayling records across England →

Most recent observation18 August 2016Net 11 · 5 fish

Largest measured grayling: 20.3 cm
Median length: 10 cm
Fish measured: 5
Survey locations: 6

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
20.3 cm	18 Aug 2016	Net 11	149747
18.6 cm	18 Aug 2016	Net 11	149747
10 cm	18 Aug 2016	Net 11	149747
9.8 cm	18 Aug 2016	Net 11	149747
9.4 cm	18 Aug 2016	Net 11	149747

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
Net 11	18 Aug 2016	18 Aug 2016	1
Net 6	21 Oct 2015	21 Oct 2015	1
Net 5	21 Oct 2015	21 Oct 2015	1
Net 4	21 Oct 2015	21 Oct 2015	1
Net 3	21 Oct 2015	21 Oct 2015	1
Net 2	21 Oct 2015	21 Oct 2015	1

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

2015–2016

Survey records by year

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

515

116

Fish measured by surveyors

Measured length distribution

See how the 5 measured fish were spread across different length ranges.

Smallest: 9.4 cm
Lower quarter: 9.8 cm
Median: 10 cm
Upper quarter: 18.6 cm
Largest: 20.3 cm

0–99 mm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Yedingham (Straightened Derwent project)

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

3-spined stickleback Bullhead Dace Minnow Pike

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 →