RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Dun

Largest measured brown / sea trout: 51.8 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Dun was 51.8 cm, recorded at Beat 9 - Eel on 17 October 2023.

Across 698 measured brown / sea trout, the median measured length was 20.1 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 Dun.

See brown / sea trout records across England →

Most recent observation16 October 2025Oakhill Farm - Eel · 80 fish
Largest measured brown / sea trout
51.8 cm
Median length
20.1 cm
Fish measured
698
Survey locations
4

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
51.8 cm17 Oct 2023Beat 9 - Eel164400
50.5 cm26 Aug 2010Freemans Marsh- DS gauging weir125275
48.8 cm22 Mar 2006Freemans Marsh90430
48.7 cm17 Oct 2023Beat 9 - Eel164400
48.3 cm15 Oct 2024Beat 9 - Eel167915
48.2 cm27 Mar 2007Freemans Marsh104912
47.9 cm15 Oct 2024Beat 9 - Eel167915
47.9 cm17 Oct 2023Beat 9 - Eel164400
47.3 cm27 Mar 2007Freemans Marsh104912
47.1 cm17 Oct 2023Beat 9 - Eel164400

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
Oakhill Farm - Eel25 Oct 202316 Oct 20253
Beat 9 - Eel17 Oct 202316 Oct 20253
Freemans Marsh22 Mar 200620 Mar 20255
Freemans Marsh- DS gauging weir26 Aug 201026 Aug 20101

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

2006–2025

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 698 measured fish were spread across different length ranges.

Smallest
6.8 cm
Lower quarter
12.6 cm
Median
20.1 cm
Upper quarter
28 cm
Largest
51.8 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Dun

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

Bullhead Gudgeon Grayling Dace Pike Roach

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 →