RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the Main river sites

Largest measured brown / sea trout: 55 cm

The largest brown / sea trout measured in Environment Agency surveys of the Main river sites was 55 cm, recorded at Sturminster Marshall Island on 16 September 2025.

Across 461 measured brown / sea trout, the median measured length was 23.4 cm.

Surveyors recorded weights for 5 brown / sea trout. The median was 4 oz (0.113 kg) and the largest recorded weight was 1 lb 5.2 oz (0.602 kg).

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

See brown / sea trout records across England →

Most recent observation18 September 2025Canford School (top site S2S) · 2 fish
Largest measured brown / sea trout
55 cm
Median length
23.4 cm
Fish measured
461
Survey locations
32

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
55 cm16 Sept 2025Sturminster Marshall Island180276
50.5 cm16 May 2013S4R Dudsbury to Merritown136064
48.9 cm20 May 2008S3R Corfe Mullen to Cowgrove111010
47.1 cm22 Jun 2004S3R Corfe Mullen to Cowgrove80192
45.8 cm30 May 2013S3R Corfe Mullen to Cowgrove136294
45.5 cm20 May 2008S3R Corfe Mullen to Cowgrove111010
43.5 cm9 Aug 2010Blandford channel123333
43 cm16 Sept 2025Crawford Bridge180274
42 cm19 Sept 2023Kinson164345
41 cm22 Jun 2004S3R Corfe Mullen to Cowgrove80192

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
Muscliffe- Kingfisher Barn Visitor Centre17 Sept 201918 Sept 20255
Longham Bridge5 Sept 201218 Sept 20258
Kinson8 Sept 200318 Sept 20257
Cowgrove Weir22 Sept 200518 Sept 20257
Canford School (top site S2S)11 Sept 200318 Sept 202510
d/s Blandford Weir23 Sept 200516 Sept 20257
Sturminster Marshall Island16 Sept 201916 Sept 20253
Durweston Downstream of footbridge18 Sept 202416 Sept 20252
Crawford Bridge17 Sept 200316 Sept 202511
Court Farm25 Sept 200516 Sept 20256
Charlton Marshall Island16 Sept 201916 Sept 20255
Throop d/s Glens Weir17 Sept 201919 Sept 20243
Keyneston Mill26 Sept 200518 Sept 20246
S1 Gillingham17 Jul 20028 Jun 202314
Blandford - Stour Meadow13 Jun 201827 Jul 20223
Stour at Millmore Farm1 Aug 20191 Aug 20191
S2 Upstream Eccliffe8 Aug 20026 Jun 20195
S5 Strangeways5 Aug 200223 May 20198
S3R Corfe Mullen to Cowgrove22 Jun 200427 Jun 20187
Canford Mill Stream31 May 201230 May 20182
S1R Fiddleford to Child Okeford12 May 200517 May 20187
S4R Dudsbury to Merritown16 May 201316 May 20131
A347 Road Bridge11 Oct 20055 Sept 20122
S8 Blandford4 Sept 20124 Sept 20121
U/s Whitemill Bridge26 Sept 200515 Aug 20122
S9 Spetisbury30 May 201230 May 20121
S6 Child okeford8 Jun 20118 Jun 20111
The Ship Inn2 Jun 200524 Aug 20103
Blandford channel9 Aug 20109 Aug 20101
Canford School (Bottom Site S3S)11 Sept 200311 Oct 20052
Ham Carpark23 Sept 200523 Sept 20051
Spetisbury Ford8 Sept 20038 Sept 20031

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 461 measured fish were spread across different length ranges.

Smallest
5.9 cm
Lower quarter
17.8 cm
Median
23.4 cm
Upper quarter
29 cm
Largest
55 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 5 brown / sea trout. This is a subset of the measured fish and may not represent the whole population.

Lightest
2.6 oz (0.073 kg)
Lower quarter
2.6 oz (0.073 kg)
Median
4 oz (0.113 kg)
Upper quarter
13.5 oz (0.382 kg)
Heaviest
1 lb 5.2 oz (0.602 kg)

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

More fish in this river

Explore the Main river sites

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

Minnow Bullhead European eel Dace Stone loach Chub

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 →