Brown / sea trout · Salmo trutta

Brown / sea trout in the By Brook main river

Largest measured brown / sea trout: 38.6 cm

The largest brown / sea trout measured in Environment Agency surveys of the By Brook main river was 38.6 cm, recorded at D/s Bathford Paper mill on 12 September 2013.

Across 802 measured brown / sea trout, the median measured length was 18 cm.

Surveyors recorded weights for 523 brown / sea trout. The median was 2.8 oz (0.08 kg) and the largest recorded weight was 1 lb 1.7 oz (0.503 kg).

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

See brown / sea trout records across England →

Most recent observation11 October 2018Weavern (Se-03) · 50 fish

Largest measured brown / sea trout: 38.6 cm
Median length: 18 cm
Fish measured: 802
Survey locations: 8

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.

Length	Survey date	Survey location	Survey ID
38.6 cm	12 Sept 2013	D/s Bathford Paper mill	138671
32.8 cm	13 May 1999	Drewett's Mill	23166
32.6 cm	13 May 1999	Drewett's Mill	23166
32.5 cm	8 Aug 2002	Castle Combe Golf Course (Se-02)	55714
32.1 cm	7 Aug 2002	Gatcombe Mill	55712
31.8 cm	23 Mar 1999	Gatcombe Mill	23045
31.5 cm	19 Jul 2010	Slaughterford	122967
31.5 cm	14 Apr 1999	Long Dean	23123
31.5 cm	8 Apr 1999	Castle Combe Golf Course (Se-02)	23047
31.2 cm	7 May 1999	Middlehill	23183

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 surveyed	First recorded	Last recorded	Visits finding brown / sea trout
Weavern (Se-03)	20 Apr 1999	11 Oct 2018	4
Middlehill	7 May 1999	9 Oct 2018	3
D/s Bathford Paper mill	12 Sept 2013	12 Sept 2013	1
Gatcombe Mill	23 Mar 1999	18 Apr 2013	3
Slaughterford	15 Apr 1999	19 Jul 2010	2
Castle Combe Golf Course (Se-02)	8 Apr 1999	8 Aug 2002	2
Drewett's Mill	13 May 1999	13 May 1999	1
Long Dean	14 Apr 1999	14 Apr 1999	1

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

1999–2018

Survey records by year

Each bar shows how many survey visits recorded brown / sea trout that year.

799

000

001

202

103

004

005

006

007

008

009

210

011

112

213

014

015

016

017

218

Fish measured by surveyors

Measured length distribution

See how the 802 measured fish were spread across different length ranges.

Smallest: 4.4 cm
Lower quarter: 13 cm
Median: 18 cm
Upper quarter: 22.3 cm
Largest: 38.6 cm

0–99 mm

100–199 mm

415

200–299 mm

289

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 523 brown / sea trout. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.001 kg)
Lower quarter: 0.9 oz (0.025 kg)
Median: 2.8 oz (0.08 kg)
Upper quarter: 5.1 oz (0.146 kg)
Heaviest: 1 lb 1.7 oz (0.503 kg)

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

More fish in this river

Explore the By Brook main river

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

Bullhead 3-spined stickleback Minnow Stone loach 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 →