Brown / sea trout · Salmo trutta

Brown / sea trout in the Olchon Brook

Largest measured brown / sea trout: 30 cm

The largest brown / sea trout measured in Environment Agency surveys of the Olchon Brook was 30 cm, recorded at Glandwr on 14 August 2019.

Across 688 measured brown / sea trout, the median measured length was 8.9 cm.

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

See brown / sea trout records across England →

Most recent observation14 August 2025Glandwr · 20 fish

Largest measured brown / sea trout: 30 cm
Median length: 8.9 cm
Fish measured: 688
Survey locations: 6

Individual EA measurements

Largest measured brown / sea trout

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 cm	14 Aug 2019	Glandwr	155156
27 cm	22 Aug 1995	W059	89215
27 cm	11 Jul 1990	W059	90153
26 cm	22 Jul 2008	Glandwr	115879
26 cm	22 Aug 1995	W059	89215
25.6 cm	28 Aug 1999	W059	80535
25 cm	22 Aug 1995	W059	89215
24.9 cm	28 Aug 1999	W059	80535
24.8 cm	11 Aug 1992	W059	89621
24.7 cm	19 Sept 2012	Brass Knoll	133927

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where brown / sea trout were found

Each point marks a survey location with at least one brown / sea trout 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 brown / sea trout
Glandwr	20 Sept 2000	14 Aug 2025	7
Brass Knoll	19 Sept 2012	19 Sept 2012	1
W059E	13 Sept 2000	15 Sept 2003	3
W059D	13 Sept 2000	15 Sept 2003	3
W059C	20 Sept 2000	15 Sept 2003	3
W059	11 Jul 1989	28 Aug 1999	8

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

1989–2025

Survey records by year

Each bar shows how many survey visits recorded brown / sea trout that year.

189

190

191

192

193

094

195

096

197

098

199

400

001

402

403

004

005

006

007

108

009

010

011

212

013

014

015

016

017

018

119

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 688 measured fish were spread across different length ranges.

Smallest: 4.6 cm
Lower quarter: 7.1 cm
Median: 9 cm
Upper quarter: 15 cm
Largest: 30 cm

0–99 mm

359

100–199 mm

277

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Olchon Brook

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

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 →