Brown / sea trout · Salmo trutta

Brown / sea trout in the Roman River (Headwaters)

Largest measured brown / sea trout: 36.4 cm

The largest brown / sea trout measured in Environment Agency surveys of the Roman River (Headwaters) was 36.4 cm, recorded at Colchester Zoo on 6 March 2009.

Across 292 measured brown / sea trout, the median measured length was 11.5 cm.

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Roman River (Headwaters).

See brown / sea trout records across England →

Most recent observation5 October 2025Colchester Zoo · 50 fish

Largest measured brown / sea trout: 36.4 cm
Median length: 11.5 cm
Fish measured: 292
Survey locations: 3

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
36.4 cm	6 Mar 2009	Colchester Zoo	117105
35.2 cm	6 Mar 2009	Colchester Zoo	117105
31.1 cm	5 Feb 2015	Swan Bridge	144610
28.8 cm	5 Feb 2015	Swan Bridge	144610
28.7 cm	5 Feb 2015	Swan Bridge	144610
28.5 cm	6 Mar 2009	Colchester Zoo	117105
27.5 cm	6 Mar 2009	Colchester Zoo	117105
26.1 cm	9 Sept 2021	Colchester Zoo	160294
26.1 cm	5 Feb 2015	Swan Bridge	144610
26 cm	25 Oct 2023	Colchester Zoo	164462

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
Colchester Zoo	18 Mar 2003	5 Oct 2025	11
Swan Bridge	18 Feb 2009	5 Feb 2015	2
Aldham Hall	18 Feb 2009	18 Feb 2009	1

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

2003–2025

Survey records by year

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

103

004

005

006

007

008

309

010

011

012

013

014

215

016

117

118

119

020

121

122

123

124

125

Fish measured by surveyors

Measured length distribution

See how the 292 measured fish were spread across different length ranges.

Smallest: 6.8 cm
Lower quarter: 9.8 cm
Median: 11.5 cm
Upper quarter: 14.4 cm
Largest: 36.4 cm

0–99 mm

100–199 mm

173

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Roman River (Headwaters)

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

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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 →