Grayling · Thymallus thymallus

Grayling in the North Stream

Largest measured grayling: 28.5 cm

The largest grayling measured in Environment Agency surveys of the North Stream was 28.5 cm, recorded at 9 Hatches on 15 September 2010.

Across 30 measured grayling, the median measured length was 12.9 cm.

Surveyors recorded weights for 3 grayling. The median was 0.9 oz (0.025 kg) and the largest recorded weight was 0.9 oz (0.026 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the North Stream.

See grayling records across England →

Most recent observation17 September 20259 Hatches · 3 fish

Largest measured grayling: 28.5 cm
Median length: 12.9 cm
Fish measured: 30
Survey locations: 4

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
28.5 cm	15 Sept 2010	9 Hatches	123947
28.4 cm	21 Sept 2005	Duddle Farm	86498
28.2 cm	15 Oct 2004	9 Hatches	82799
26.8 cm	21 Sept 2005	Duddle Farm	86498
26.7 cm	13 Sept 2005	Carrier north of Tenantrees	86480
24.4 cm	20 Jul 2017	9 Hatches	151004
21.9 cm	13 Sept 2005	Carrier north of Tenantrees	86480
15 cm	15 Oct 2004	9 Hatches	82799
13.8 cm	1 Sept 2009	9 Hatches	118729
13.7 cm	5 Sept 2007	9 Hatches	106896

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
9 Hatches	29 Oct 2002	17 Sept 2025	11
Duddle Farm	21 Sept 2005	21 Sept 2005	1
Middle Channel at Tenantrees	13 Sept 2005	13 Sept 2005	1
Carrier north of Tenantrees	13 Sept 2005	13 Sept 2005	1

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

2002–2025

Survey records by year

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

102

003

104

405

106

107

008

109

110

111

012

113

014

015

016

117

018

019

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 30 measured fish were spread across different length ranges.

Smallest: 9.6 cm
Lower quarter: 12.1 cm
Median: 13 cm
Upper quarter: 14.7 cm
Largest: 28.5 cm

0–99 mm

100–199 mm

200–299 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 3 grayling. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.5 oz (0.013 kg)
Lower quarter: 0.7 oz (0.019 kg)
Median: 0.9 oz (0.025 kg)
Upper quarter: 0.9 oz (0.0255 kg)
Heaviest: 0.9 oz (0.026 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the North Stream

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

Brown / sea trout Atlantic salmon Pike European eel Bullhead Minnow

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 →