RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Thames

Largest measured brown / sea trout: 53.8 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Thames was 53.8 cm, recorded at Whitchurch (Weirpool) on 22 July 2025.

Across 83 measured brown / sea trout, the median measured length was 32 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 Thames.

See brown / sea trout records across England →

Most recent observation22 July 2025Whitchurch (Weirpool) · 1 fish
Largest measured brown / sea trout
53.8 cm
Median length
32 cm
Fish measured
83
Survey locations
19

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.

LengthSurvey dateSurvey locationSurvey ID
53.8 cm22 Jul 2025Whitchurch (Weirpool)178496
49.1 cm5 Jun 2001Buscot to Grafton79305
46.9 cm14 Oct 2010Water eaton125348
46.8 cm15 Oct 2013Roundhouse to St Johns(margins)139788
46.2 cm23 Oct 2008Northmoor Wier pool116007
44 cm15 Oct 2013Roundhouse to St Johns(margins)139788
43.9 cm14 Oct 2010Water eaton125348
43.6 cm5 Jun 2001Buscot to Grafton79305
43.5 cm12 Oct 2009Roundhouse to St Johns(margins)120532
43.2 cm11 Oct 2013Cricklade139766

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 surveyedFirst recordedLast recordedVisits finding brown / sea trout
Whitchurch (Weirpool)14 Jul 200922 Jul 20252
Days - Benson (Margin)14 Jul 202414 Jul 20241
Buscot to Grafton5 Jun 200125 Sept 20232
Water eaton2 Oct 200218 Oct 20225
Castle Eaton13 Oct 201018 Oct 20224
Cricklade23 May 200211 Oct 20166
Roundhouse to St Johns(margins)8 Oct 200428 Sept 20157
Rushey bypass channel18 Sept 201418 Sept 20141
Clifton Weir Stream4 Jul 20144 Jul 20141
Radcot Fish Pass25 Sept 201325 Sept 20131
Hambleden - Hurley (Weirpool)14 Jul 201314 Jul 20131
Rushey Weir Pool22 Oct 200725 Oct 20112
Hannington Bridge23 Oct 200914 Oct 20102
Buscot weir pool22 Oct 200713 Oct 20092
Northmoor- Pinkhill26 Sept 200323 Oct 20082
Northmoor Wier pool23 Oct 200823 Oct 20081
Shifford to Newbridge - Windrush Confluence23 Oct 200723 Oct 20071
Hambleden - Hurley (margin)25 Jul 200225 Jul 20021
Whitchurch to Mapledurham (Margin)18 Jul 200218 Jul 20021

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

2001–2025

Survey records by year

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

Fish measured by surveyors

Measured length distribution

See how the 83 measured fish were spread across different length ranges.

Smallest
9.7 cm
Lower quarter
24.7 cm
Median
32 cm
Upper quarter
41 cm
Largest
53.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Thames

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

Roach Bleak Pike Chub Perch Dace

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 →