Rainbow trout · Oncorhynchus mykiss

Rainbow trout in the Great Eau FMU

Largest measured rainbow trout: 45.6 cm

The largest rainbow trout measured in Environment Agency surveys of the Great Eau FMU was 45.6 cm, recorded at Withern Road Bridge on 20 April 1995.

Across 438 measured rainbow trout, the median measured length was 27.9 cm.

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

See rainbow trout records across England →

Most recent observation2 June 2022Withern Road Bridge · 38 fish

Largest measured rainbow trout: 45.6 cm
Median length: 27.9 cm
Fish measured: 438
Survey locations: 5

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
45.6 cm	20 Apr 1995	Withern Road Bridge	57796
45.2 cm	7 Apr 1992	Claythorpe Gauging Station	57781
44.1 cm	20 Nov 2013	Claythorpe Gauging Station	140211
42.8 cm	7 Apr 1992	Claythorpe Gauging Station	57781
42.3 cm	7 Apr 1992	Claythorpe Gauging Station	57781
42.1 cm	18 Aug 1986	Belleau Spring	57754
40.1 cm	20 Apr 1995	Withern Road Bridge	57796
39.7 cm	7 Apr 1992	Claythorpe Gauging Station	57781
37.7 cm	19 Jul 1994	Claythorpe Gauging Station	58076
37.3 cm	29 Sept 1995	Claythorpe Gauging Station	58101

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
Withern Road Bridge	20 Apr 1995	2 Jun 2022	3
Claythorpe Gauging Station	18 Oct 1989	1 Jun 2022	9
DS Claythorpe Mill	23 Oct 2015	30 May 2018	2
Woods Farm	18 Aug 1986	11 Apr 1995	2
Belleau Spring	18 Aug 1986	11 Apr 1995	2

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

1986–2022

Survey records by year

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

286

087

088

189

090

091

192

093

194

595

096

097

098

099

000

001

002

103

004

005

006

007

008

109

010

011

012

213

014

115

016

017

118

019

020

021

222

Fish measured by surveyors

Measured length distribution

See how the 438 measured fish were spread across different length ranges.

Smallest: 10.1 cm
Lower quarter: 19.7 cm
Median: 27.9 cm
Upper quarter: 31.6 cm
Largest: 45.6 cm

100–199 mm

114

200–299 mm

142

300–399 mm

175

400–499 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Great Eau FMU

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

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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 →