RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Main Tamar

Largest measured brown / sea trout: 83.9 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Main Tamar was 83.9 cm, recorded at Gunnislake Weir Index River Fish Trap on 12 June 1989.

Across 22,153 measured brown / sea trout, the median measured length was 31.2 cm.

Surveyors recorded weights for 16,562 brown / sea trout. The median was 13.2 oz (0.375 kg) and the largest recorded weight was 18 lb 1.2 oz (8.2 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 Main Tamar.

See brown / sea trout records across England →

Most recent observation6 August 2025Tamarstone · 13 fish
Largest measured brown / sea trout
83.9 cm
Median length
31.2 cm
Fish measured
22,153
Survey locations
36

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
83.9 cm12 Jun 1989Gunnislake Weir Index River Fish Trap156662
80 cm31 May 1988Gunnislake Weir Index River Fish Trap156596
76.7 cm30 May 1989Gunnislake Weir Index River Fish Trap156656
76.3 cm29 Apr 2003Gunnislake Weir Index River Fish Trap156800
75.1 cm20 May 2008Gunnislake Weir Index River Fish Trap158086
73.5 cm14 May 2003Gunnislake Weir Index River Fish Trap156809
72.9 cm5 Jul 2012Gunnislake Weir Index River Fish Trap159137
71.6 cm4 May 2011Gunnislake Weir Index River Fish Trap158813
71.5 cm10 Jun 2015Gunnislake Weir Index River Fish Trap159517
71.2 cm10 May 2005Gunnislake Weir Index River Fish Trap157282

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
Tamarstone2 Aug 19906 Aug 202525
u/s North Tamerton2 Sept 199316 Aug 202412
Lawhitton18 Aug 19935 Sept 20233
Wishworthy16 Sept 199623 Aug 20235
Gordonhill Plantation23 Aug 202323 Aug 20231
d/s Greystone Bridge17 Aug 199312 Jul 20234
Dexbeer3 Aug 19906 Sept 202218
Southcombe16 Aug 199319 Aug 20222
Bridgerule24 Jul 19901 Aug 202213
Gunnislake Weir Index River Fish Trap22 May 198611 Dec 20181767
Tamartown1 Aug 199015 Aug 20185
Luffincott19 Aug 199315 Aug 20185
u/s Tamar Lakes3 Jun 199319 May 20169
Tetcott Spawning Bed 128 Sept 201028 Sept 20101
Gravel18 Sept 19969 Aug 20102
Tetcott Spawning Bed 225 Sept 200625 Sept 20061
Boyton11 Sept 200611 Sept 20061
North Tamerton10 Aug 19909 Aug 200613
Great Moreton19 Aug 19939 Aug 20066
u/s Lamerhooe Ford9 Jul 20049 Jul 20041
Lowley Confluence2 Jul 20042 Jul 20041
d/s Small Brook8 Jul 19998 Jul 19991
Crowford Bridge30 Jul 199214 Aug 19987
Bradford Manor31 Jul 199222 Jul 19974
u/s Polson Bridge17 Sept 199617 Sept 19961
Moreton Mill4 Jun 199317 Sept 19962
u/s Trepoyle5 Jul 19937 Sept 19932
d/s Trepoyle5 Jul 19937 Sept 19932
d/s Crowford Bridge8 Jun 19936 Sept 19932
Haydon2 Jul 19936 Sept 19932
d/s North Tamerton (lower riffle)2 Sept 19932 Sept 19931
d/s Netherbridge18 Aug 199318 Aug 19931
d/s North Tamerton (upper riffle)8 Jun 19938 Jun 19931
u/s North Tamerton (upper riffle)7 Jun 19937 Jun 19931
u/s North Tamerton (lower riffle)7 Jun 19937 Jun 19931
Virworthy4 Jun 19934 Jun 19931

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

1986–2025

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 22,153 measured fish were spread across different length ranges.

Smallest
2.2 cm
Lower quarter
29.2 cm
Median
31.2 cm
Upper quarter
37.6 cm
Largest
83.9 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 16,562 brown / sea trout. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.4 oz (0.01 kg)
Lower quarter
10.6 oz (0.3 kg)
Median
13.2 oz (0.375 kg)
Upper quarter
1 lb 8.3 oz (0.69 kg)
Heaviest
18 lb 1.2 oz (8.2 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 Main Tamar

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

Bullhead Stone loach Atlantic salmon Minnow European eel Grayling

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 →