RiverFish

European eel · Anguilla anguilla

European eel in the River Onny

Largest measured european eel: 64 cm

The largest european eel measured in Environment Agency surveys of the River Onny was 64 cm, recorded at Park Farm on 19 September 2018.

Across 119 measured european eel, the median measured length was 38 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 european eel records across England →

Most recent observation20 August 2025Upstream Plowden Mill · 1 fish
Largest measured european eel
64 cm
Median length
38 cm
Fish measured
119
Survey locations
6

Individual EA measurements

Largest measured european eel

The largest individual measurements in this river and species dataset. Equal measurements are retained as separate surveyed fish.

LengthSurvey dateSurvey locationSurvey ID
64 cm19 Sept 2018Park Farm153392
63 cm23 Aug 2022Park Farm161300
62 cm31 Jul 2012Park Farm132705
60 cm14 Jul 2010Park Farm124629
60 cm8 May 2003Bromfield76046
58 cm20 Aug 2025Upstream Plowden Mill178017
57 cm18 Sept 2019Park Farm155392
57 cm8 May 2003Park Farm76242
55 cm23 Jun 2000Bromfield15667
55 cm23 Jun 2000Bromfield15667

Lengths are direct survey measurements. RiverFish does not estimate fish weights from length.

Explore the river

Where european eel were found

Each point marks a survey location with at least one european eel 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 european eel
Upstream Plowden Mill26 Sept 202220 Aug 20252
Park Farm23 Jun 200023 Aug 202211
Craven Arms (DS Halford Weir)4 Aug 20214 Aug 20211
Bromfield25 Sept 19918 May 20033
Horderley30 Jun 199323 Jun 20002
Linley18 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 european eel that year.

Fish measured by surveyors

Measured length distribution

See how the 119 measured fish were spread across different length ranges.

Smallest
19 cm
Lower quarter
29.7 cm
Median
38 cm
Upper quarter
46.5 cm
Largest
64 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 Brown / sea trout Atlantic salmon 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 →