RiverFish

Atlantic salmon · Salmo salar

Atlantic salmon in the River Main Allen

Largest measured atlantic salmon: 15.8 cm

The largest atlantic salmon measured in Environment Agency surveys of the River Main Allen was 15.8 cm, recorded at Trehannick on 17 August 2002.

Across 978 measured atlantic salmon, the median measured length was 6.4 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 atlantic salmon records across England →

Most recent observation14 August 2025Trehannick · 7 fish
Largest measured atlantic salmon
15.8 cm
Median length
6.4 cm
Fish measured
978
Survey locations
14

Individual EA measurements

Largest measured atlantic salmon

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
15.8 cm17 Aug 2002Trehannick72043
14.8 cm15 Sept 2003Littlewood Mill77206
14.5 cm15 Aug 2013Trehannick137898
14.4 cm19 Aug 2015Trehannick146031
14.3 cm28 Aug 2003Trehannick77305
14.3 cm28 Aug 2003Trehannick77305
14.2 cm13 Jul 2011Littlewood Mill126974
13.8 cm28 Aug 2003Trehannick77305
13.8 cm28 Aug 2003Trehannick77305
13.6 cm16 Sept 2003Dinhams Bridge77249

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where atlantic salmon were found

Each point marks a survey location with at least one atlantic salmon 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 atlantic salmon
Trehannick17 Jul 198014 Aug 202525
Treforda19 Jun 19859 Aug 201813
Littlewood Mill27 Jun 198527 Jul 201816
Trehannick Saw Mill (control)28 Sept 201128 Sept 20111
Trehannick Saw Mill (restored)27 Sept 201127 Sept 20111
Dinhams Bridge25 Jul 198014 Jul 201113
Lamellan27 Jul 198013 Jul 201115
d/s Knightsmill21 Jul 198015 Sept 200313
Lanteglos18 Jul 198011 Sept 20029
u/s Trewen2 Jul 19906 Sept 20024
Trevia6 Jun 19896 Sept 20026
Allenbrook30 May 20014 Sept 20012
Kestlewood20 Jun 198520 Jul 20009
d/s Trewen2 Jul 19902 Jul 19901

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 atlantic salmon that year.

Fish measured by surveyors

Measured length distribution

See how the 978 measured fish were spread across different length ranges.

Smallest
3.2 cm
Lower quarter
5.7 cm
Median
6.4 cm
Upper quarter
10 cm
Largest
15.8 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.

Brown / sea trout Bullhead European eel 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 →