RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the Main River Coly

Largest measured brown / sea trout: 33 cm

The largest brown / sea trout measured in Environment Agency surveys of the Main River Coly was 33 cm, recorded at Heathayne (Te)* on 15 June 2010.

Across 515 measured brown / sea trout, the median measured length was 14.6 cm.

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 Coly.

See brown / sea trout records across England →

Most recent observation11 July 2025Upstream Cadhayne (Te) · 3 fish
Largest measured brown / sea trout
33 cm
Median length
14.6 cm
Fish measured
515
Survey locations
9

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
33 cm15 Jun 2010Heathayne (Te)*122406
32 cm4 Jun 2010Upstream Colyford (Sp)121828
30.9 cm30 Jun 2023Upstream Cadhayne (Te)163941
30.8 cm30 May 2024Downstream FT BR Cadhayne (5 min)165420
30 cm15 Jun 2009Heathayne (Te)*117362
29.8 cm26 Jun 2008Heathayne (Te)*111664
29.3 cm15 Jun 2009Heathayne (Te)*117362
29 cm16 May 2022Upstream Cadhayne (Te)161081
27.8 cm6 May 2020Upstream Southleigh Str162284
27.8 cm12 Jun 2017Upstream Cadhayne (Te)150670

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 Cadhayne (Te)7 Jul 201611 Jul 20257
Downstream FT BR Cadhayne (5 min)30 Jun 202330 May 20242
Upstream Colyford (5 min)29 Jun 202324 May 20242
Upstream Chantry Bridge (5 min)30 Jun 202324 May 20242
Colemans Cross (5 min)28 Jun 202324 May 20242
Upstream Colyford (Sp)18 Jul 199729 Jun 20238
Woodbridge (Sp)18 Jul 199731 May 20239
Upstream Southleigh Str6 May 20206 May 20201
Heathayne (Te)*22 Jul 199710 Jun 201514

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

1997–2025

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 515 measured fish were spread across different length ranges.

Smallest
3 cm
Lower quarter
6.7 cm
Median
14.6 cm
Upper quarter
17.6 cm
Largest
33 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Main River Coly

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

Bullhead Stone loach European eel Minnow 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 →