Grayling · Thymallus thymallus

Grayling in the River Ouse

Largest measured grayling: 30.4 cm

The largest grayling measured in Environment Agency surveys of the River Ouse was 30.4 cm, recorded at Sheffield Bridge on 20 August 2002.

Across 14 measured grayling, the median measured length was 21.2 cm.

Surveyors recorded weights for 13 grayling. The median was 4.1 oz (0.115 kg) and the largest recorded weight was 11.7 oz (0.332 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 Ouse.

See grayling records across England →

Most recent observation25 October 2011Sloop Weir Downstream · 1 fish

Largest measured grayling: 30.4 cm
Median length: 21.2 cm
Fish measured: 14
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
30.4 cm	20 Aug 2002	Sheffield Bridge	63540
27.2 cm	16 Sept 2004	Sheffield Bridge	82313
24.5 cm	13 Aug 2003	Sheffield Bridge	76696
24 cm	13 Sept 2006	Sheffield Bridge	102501
23 cm	13 Sept 2005	Sheffield Bridge	87605
22.6 cm	24 Aug 2004	Sloop	81613
21.7 cm	24 Aug 2004	Sloop	81613
20.8 cm	25 Oct 2011	Sloop Weir Downstream	128763
20.6 cm	13 Aug 2003	Sheffield Bridge	76696
20 cm	16 Sept 2004	Sheffield Bridge	82313

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
Sloop Weir Downstream	25 Oct 2011	25 Oct 2011	1
Sheffield Bridge	20 Aug 2002	13 Sept 2006	5
Sloop	1 Aug 2003	24 Aug 2004	2

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

2002–2011

Survey records by year

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

102

203

204

105

106

007

008

009

010

111

Fish measured by surveyors

Measured length distribution

See how the 14 measured fish were spread across different length ranges.

Smallest: 8.4 cm
Lower quarter: 19.4 cm
Median: 21.3 cm
Upper quarter: 23.8 cm
Largest: 30.4 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 13 grayling. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.006 kg)
Lower quarter: 2.8 oz (0.078 kg)
Median: 4.1 oz (0.115 kg)
Upper quarter: 5.8 oz (0.164 kg)
Heaviest: 11.7 oz (0.332 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 Ouse

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

European eel Perch Roach Dace Gudgeon Stone loach

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 →