RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Derwent

Largest measured brown / sea trout: 21.5 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Derwent was 21.5 cm, recorded at 1597.00 Isel Hall, Blumer Beck, River Derwent on 17 September 2024.

Across 167 measured brown / sea trout, the median measured length was 8.2 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 Derwent.

See brown / sea trout records across England →

Most recent observation1 July 20251597.00 Isel Hall, Blumer Beck, River Derwent · 4 fish
Largest measured brown / sea trout
21.5 cm
Median length
8.2 cm
Fish measured
167
Survey locations
17

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
21.5 cm17 Sept 20241597.00 Isel Hall, Blumer Beck, River Derwent167144
19.7 cm17 Sept 20241597.00 Isel Hall, Blumer Beck, River Derwent167144
17.7 cm6 Sept 20211597.00 Isel Hall, Blumer Beck, River Derwent160347
17.4 cm1 Jul 20251597.00 Isel Hall, Blumer Beck, River Derwent177152
16.4 cm6 Sept 20211597.00 Isel Hall, Blumer Beck, River Derwent160347
16.1 cm25 Jul 20231590.00 Dubwath Beck, Wythop Beck162788
16 cm1 Jul 20251597.00 Isel Hall, Blumer Beck, River Derwent177152
15.8 cm7 Jul 20231595.00 Coal Beck, River Derwent162709
15.4 cm6 Sept 20211597.00 Isel Hall, Blumer Beck, River Derwent160347
14.9 cm6 Jul 20231521.00 Longthwaite, River Derwent162676

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
1597.00 Isel Hall, Blumer Beck, River Derwent23 Jul 20041 Jul 202510
1590.00 Dubwath Beck, Wythop Beck15 Jul 200225 Jul 20236
1595.00 Coal Beck, River Derwent26 Jul 20047 Jul 20235
1565.00 Applethwaite Gill, River Derwent15 Jul 20026 Jul 20236
1521.00 Longthwaite, River Derwent25 Jul 20026 Jul 20235
1519.65 Seathwaite, River Derwent26 Aug 20102 Aug 20174
1596.00 Blumer Bridge, Blumer Beck22 Jul 20087 Jul 20174
1520.00 Thorneythwaite, River Derwent25 Jul 20025 Sept 20164
1545.98 National Trust Office, Brockle Beck16 Oct 200916 Oct 20091
1545.92 Springs Frm, DS barrier, Brockle Beck16 Oct 200916 Oct 20091
1545.90 Springs Frm US bridge and barrier16 Oct 200916 Oct 20091
1545.87 DS footbridge at top barrier, Brockle Bec16 Oct 200916 Oct 20091
1545.86 US Footbridge, top barrier, Brockle Beck16 Oct 200916 Oct 20091
1532.00 At Isel, River Derwent30 Jul 200430 Jul 20041
1528.00 US of Barkhouse Weir, River Derwent30 Jul 200430 Jul 20041
1525.00 High Stock Bridge25 Jul 200225 Jul 20021
1522.00 Grange, River Derwent25 Jul 200225 Jul 20021

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

2002–2025

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 167 measured fish were spread across different length ranges.

Smallest
5.9 cm
Lower quarter
7.4 cm
Median
8.2 cm
Upper quarter
9 cm
Largest
21.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Derwent

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

European eel Atlantic salmon

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 →