RiverFish

European eel · Anguilla anguilla

European eel in the River Main Inny

Largest measured european eel: 65 cm

The largest european eel measured in Environment Agency surveys of the River Main Inny was 65 cm, recorded at Trewinnow on 24 September 2021.

Across 423 measured european eel, the median measured length was 27 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 Main Inny.

See european eel records across England →

Most recent observation13 August 2025St. Clether · 4 fish
Largest measured european eel
65 cm
Median length
27 cm
Fish measured
423
Survey locations
17

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
65 cm24 Sept 2021Trewinnow160424
61 cm24 Sept 2021Trewinnow160424
57 cm14 Jun 2016Treguddick Mill148227
56.2 cm16 Sept 2001St. Clether116396
56 cm10 Sept 2001Treguddick116414
54.4 cm10 Sept 2001Treguddick116414
54 cm22 Jul 2021Knightsmill160437
54 cm16 Jun 2010Treguddick Mill122465
54 cm26 Jun 1996Bealsmill113726
53 cm23 Jun 2015Trewen145149

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
St. Clether6 Jul 198413 Aug 202510
Treguddick Mill25 Jul 200822 Jul 202511
Downstream Bealsmill7 Sept 20237 Sept 20231
Trewinnow7 Aug 199924 Sept 20214
Trecarrell2 Jul 198422 Sept 20218
Treglasta27 Jul 198415 Sept 20213
Bealsmill26 Jun 198426 Aug 202114
U/s Inny Vale STW13 Aug 202113 Aug 20211
Larrick5 Jun 200928 Jul 20213
Knightsmill29 Jun 198422 Jul 20217
Trewen6 Jul 198419 Jul 20217
u/s Laneast Bridge5 Jul 198416 Jul 20216
Treguddick3 Jul 198418 Jul 20069
Inny Foot26 Jun 198415 Jul 20036
Killabury29 Jun 198410 Jul 20034
Trekenner Mill2 Jul 198430 Jul 19994
Hicks Mill3 Jul 19842 Jul 19963

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

1984–2025

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 423 measured fish were spread across different length ranges.

Smallest
7.5 cm
Lower quarter
17 cm
Median
27 cm
Upper quarter
34.4 cm
Largest
65 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Main Inny

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

Atlantic salmon Brown / sea trout Bullhead Stone loach Minnow 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 →