Grayling · Thymallus thymallus

Grayling in the River Main Ottery

Largest measured grayling: 23.8 cm

The largest grayling measured in Environment Agency surveys of the River Main Ottery was 23.8 cm, recorded at Downstream Yeolm Bridge on 10 September 2015.

Across 29 measured grayling, the median measured length was 8.7 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 Main Ottery.

See grayling records across England →

Most recent observation8 July 2026Penrose · 3 fish

Largest measured grayling: 23.8 cm
Median length: 8.7 cm
Fish measured: 29
Survey locations: 9

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
23.8 cm	10 Sept 2015	Downstream Yeolm Bridge	146359
19.6 cm	28 Jul 2008	Penheale	112123
18.9 cm	5 Jul 2011	Downstream Trengune Br	126846
18.8 cm	29 Jun 2010	Penheale	122553
13.2 cm	18 Sept 2012	Yeolm Bridge	133744
12 cm	21 Aug 2002	Penheale	72765
11.1 cm	21 Aug 2002	Penheale	72765
11 cm	21 Aug 2002	Penheale	72765
10.9 cm	21 Aug 2002	Penheale	72765
10.8 cm	20 Aug 2013	Hellescott	138052

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
Penrose	8 Jul 2026	8 Jul 2026	1
Hellescott	20 Aug 2013	20 Jul 2021	2
Downstream Yeolm Bridge	10 Sept 2015	10 Sept 2015	1
Yeolm Bridge	27 Aug 1996	18 Sept 2012	3
Downstream Trengune Br	5 Jul 2011	5 Jul 2011	1
Penheale	31 Jul 1984	30 Jun 2011	9
Trengune	2 Aug 1984	28 Jul 2005	2
Werrington Park	30 Jul 1984	1 Jul 2003	2
Canworthy Water	17 Sept 2001	17 Sept 2001	1

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

1984–2026

Survey records by year

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

384

085

086

087

088

089

090

091

092

093

094

095

296

097

098

099

000

101

102

203

104

205

106

007

108

009

110

211

112

113

014

115

016

017

018

019

020

121

022

023

024

025

126

Fish measured by surveyors

Measured length distribution

See how the 29 measured fish were spread across different length ranges.

Smallest: 5.5 cm
Lower quarter: 7.5 cm
Median: 8.7 cm
Upper quarter: 11 cm
Largest: 23.8 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 River Main Ottery

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

Atlantic salmon Brown / sea trout Bullhead Stone loach Minnow European eel

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 →