RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Glaven

Largest measured brown / sea trout: 48.5 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Glaven was 48.5 cm, recorded at Upstream Glandford Mill on 8 July 1999.

Across 2,361 measured brown / sea trout, the median measured length was 15.8 cm.

Surveyors recorded weights for 8 brown / sea trout. The median was 3.4 oz (0.095 kg) and the largest recorded weight was 3.6 oz (0.102 kg).

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

See brown / sea trout records across England →

Most recent observation16 June 2026Upstream Glandford Mill · 53 fish
Largest measured brown / sea trout
48.5 cm
Median length
15.8 cm
Fish measured
2,361
Survey locations
8

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
48.5 cm8 Jul 1999Upstream Glandford Mill17752
48.2 cm10 Jun 2014Upstream Wiveton Bridge142232
48 cm8 Jul 1999Upstream Glandford Mill17752
44.8 cm10 Jun 2014Upstream Wiveton Bridge142232
44.3 cm10 Jun 2014Upstream Wiveton Bridge142232
43.8 cm10 Jun 2014Upstream Wiveton Bridge142232
43.3 cm2 Jun 2011Upstream Wiveton Bridge127610
42.7 cm2 Jun 2011Upstream Wiveton Bridge127610
42 cm10 Jun 2014Upstream Wiveton Bridge142232
41.4 cm7 Jul 2017Upstream Wiveton Bridge152330

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
Upstream Glandford Mill20 Jan 198816 Jun 202610
Letheringsett18 Jan 198821 May 202610
Upstream Thornage Ford14 Jan 198816 May 202513
D/s Hunworth railway bridge12 Jan 19887 May 202516
Upstream Wiveton Bridge19 Mar 199111 Jul 20237
Thornage Bridge13 Jan 19888 Jun 20239
Hunworth Rail Bridge U/s12 May 20085 Jun 20148
Hunworth11 Jan 198829 Apr 20083

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

1988–2026

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 2,361 measured fish were spread across different length ranges.

Smallest
3.3 cm
Lower quarter
10.6 cm
Median
15.8 cm
Upper quarter
20.3 cm
Largest
48.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 8 brown / sea trout. This is a subset of the measured fish and may not represent the whole population.

Lightest
3.2 oz (0.091 kg)
Lower quarter
3.3 oz (0.0935 kg)
Median
3.4 oz (0.095 kg)
Upper quarter
3.4 oz (0.0972 kg)
Heaviest
3.6 oz (0.102 kg)

These are direct individual weights recorded by Environment Agency surveyors. Combined bulk weights are not included.

More fish in this river

Explore the River Glaven

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

Bullhead 3-spined stickleback European eel Brook lamprey Pike Perch

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 →