RiverFish

Brown / sea trout · Salmo trutta

Brown / sea trout in the River Onny

Largest measured brown / sea trout: 39.7 cm

The largest brown / sea trout measured in Environment Agency surveys of the River Onny was 39.7 cm, recorded at Park Farm on 8 May 2003.

Across 2,029 measured brown / sea trout, the median measured length was 14 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 Onny.

See brown / sea trout records across England →

Most recent observation10 September 2025Craven Arms (DS Halford Weir) · 58 fish
Largest measured brown / sea trout
39.7 cm
Median length
14 cm
Fish measured
2,029
Survey locations
16

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
39.7 cm8 May 2003Park Farm76242
37.1 cm18 Sept 2019Park Farm155392
35.8 cm19 Jun 2014Bromfield141467
34.7 cm8 May 2003Bromfield76046
34.5 cm29 Aug 2025Bromfield178211
34.5 cm22 Jul 2016Park Farm148749
34.4 cm8 May 2003Park Farm76242
34 cm22 Jul 2016Park Farm148749
33.9 cm8 May 2003Bromfield76046
33.6 cm14 Aug 2023Craven Arms (DS Halford Weir)162920

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
Craven Arms (DS Halford Weir)4 Aug 202110 Sept 20255
Bromfield25 Sept 199129 Aug 20258
Park Farm23 Jun 200028 Aug 202514
Upstream Plowden Mill11 Aug 202120 Aug 20255
Horderley30 Jun 199320 Aug 20258
Linley Estate Downstream Brookshill Brook Confluence19 Aug 202519 Aug 20251
Appletree30 Jul 202530 Jul 20251
Cwnd House18 May 199328 Aug 20246
High House - Riffle27 Sept 202327 Sept 20231
Plowden Upstream Weir26 Sept 202210 Aug 20232
Whitcot Farm19 May 199310 Aug 20214
Linley18 May 199310 Aug 20214
Bow House19 May 19934 Aug 20215
Plowden - Red carded19 May 199323 Jun 20002
Nind18 May 199320 Jun 20002
Gatton18 May 199320 Jun 20002

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

1991–2025

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 2,029 measured fish were spread across different length ranges.

Smallest
1.9 cm
Lower quarter
8.3 cm
Median
14 cm
Upper quarter
18.1 cm
Largest
39.7 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Onny

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

Bullhead Stone loach Minnow Atlantic salmon 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 →