Rainbow trout · Oncorhynchus mykiss

Rainbow trout in the River Wye

Largest measured rainbow trout: 52.5 cm

The largest rainbow trout measured in Environment Agency surveys of the River Wye was 52.5 cm, recorded at Millers Dale on 10 August 2010.

Across 605 measured rainbow trout, the median measured length was 23.6 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 Wye.

See rainbow trout records across England →

Most recent observation28 August 2025Millers Dale · 12 fish

Largest measured rainbow trout: 52.5 cm
Median length: 23.6 cm
Fish measured: 605
Survey locations: 6

Individual EA measurements

Largest measured rainbow 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
52.5 cm	10 Aug 2010	Millers Dale	123409
51.1 cm	10 Aug 2010	Millers Dale	123409
50.3 cm	10 Aug 2010	Millers Dale	123409
49.6 cm	2 Jul 2009	Millers Dale	119240
49.5 cm	11 Aug 2008	Millers Dale	113001
49 cm	2 Jul 2009	Millers Dale	119240
48.8 cm	10 Aug 2010	Millers Dale	123409
48.5 cm	10 Aug 2010	Millers Dale	123409
48.4 cm	25 Aug 2011	Millers Dale	127633
48 cm	2 Jul 2009	Millers Dale	119240

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

Explore the river

Where rainbow trout were found

Each point marks a survey location with at least one rainbow 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 rainbow trout
Millers Dale	15 Feb 1999	28 Aug 2025	17
Caudwell Mill	20 Aug 2014	15 Sept 2023	3
Monsal Dale	13 Jul 2007	24 Aug 2015	3
Chee Dale	6 Oct 2009	6 Oct 2009	1
Wye Dale	23 Nov 1995	21 Aug 2009	4
Haddon Hall	10 Jun 2005	10 Jun 2005	1

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

1995–2025

Survey records by year

Each bar shows how many survey visits recorded rainbow trout that year.

195

096

097

098

299

000

101

102

103

104

305

106

207

108

309

110

111

212

113

114

315

016

117

018

019

020

021

022

123

024

125

Fish measured by surveyors

Measured length distribution

See how the 605 measured fish were spread across different length ranges.

Smallest: 4.4 cm
Lower quarter: 13 cm
Median: 23.6 cm
Upper quarter: 30.7 cm
Largest: 52.5 cm

0–99 mm

100–199 mm

143

200–299 mm

228

300–399 mm

104

400–499 mm

500–599 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Wye

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

Brown / sea trout Bullhead

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 →