RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Main Allen

Largest measured brown / sea trout: 36.2 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Main Allen was 36.2 cm, recorded at Dinhams Bridge on 22 July 1994.

Across 3,482 measured brown / sea trout, the median measured length was 8.3 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 Main Allen.

See brown / sea trout records across England →

Most recent observation14 August 2025Trehannick · 92 fish
Largest measured brown / sea trout
36.2 cm
Median length
8.3 cm
Fish measured
3,482
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
36.2 cm22 Jul 1994Dinhams Bridge103755
35.5 cm17 Aug 2002Trehannick72043
34.8 cm22 Jul 1994Dinhams Bridge103755
33 cm22 Aug 2023Lamellan163050
30.9 cm3 Sept 2001Littlewood Mill103440
30.2 cm13 Jul 2011Littlewood Mill126974
29.9 cm9 Sept 2002Dinhams Bridge72162
29.8 cm9 Sept 2002Dinhams Bridge72162
29.6 cm13 Aug 2009Trehannick118543
29.5 cm21 Jun 2023Dinhams Bridge162560

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
Trehannick17 Jul 198014 Aug 202530
Upstream Littlewood Mill10 Aug 202331 Jul 20242
Hillside10 Aug 202326 Jul 20242
Downstream Trehannick25 Jul 202319 Jul 20242
Pengenna25 Jul 202310 Jul 20242
Lamellan27 Jul 198022 Aug 202317
Mutley22 Aug 201117 Aug 20233
Littlewood Mill27 Jun 198510 Aug 202318
Treforda19 Jun 19857 Aug 202318
Dinhams Bridge25 Jul 198021 Jun 202315
Trehannick Saw Mill (control)28 Sept 201128 Sept 20111
Trehannick Saw Mill (restored)27 Sept 201127 Sept 20111
Trevia16 Jul 198529 Jun 200614
d/s Knightsmill21 Jul 198015 Sept 200313
u/s Trewen2 Jul 19909 Sept 200310
Lanteglos18 Jul 198011 Sept 200211
Allenbrook30 May 20014 Sept 20012
Kestlewood20 Jun 198520 Jul 200010
d/s Trewen10 Sept 19882 Jul 19902

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

1980–2025

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 3,482 measured fish were spread across different length ranges.

Smallest
3.7 cm
Lower quarter
6.7 cm
Median
8.3 cm
Upper quarter
14 cm
Largest
36.2 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Allen

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

Bullhead European eel Atlantic salmon Brook lamprey

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 →