RiverFish

European eel · Anguilla anguilla

European eel in the River Main Allen

Largest measured european eel: 51.5 cm

The largest european eel measured in Environment Agency surveys of the River Main Allen was 51.5 cm, recorded at Lanteglos on 13 July 1999.

Across 736 measured european eel, the median measured length was 20.5 cm.

Surveyors recorded weights for 2 european eel. The median was 5 oz (0.1405 kg) and the largest recorded weight was 9.2 oz (0.26 kg).

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 Allen.

See european eel records across England →

Most recent observation14 August 2025Trehannick · 2 fish
Largest measured european eel
51.5 cm
Median length
20.5 cm
Fish measured
736
Survey locations
16

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
51.5 cm13 Jul 1999Lanteglos103504
50.5 cm22 Jun 2000Lanteglos103487
50.3 cm4 Sept 2001Allenbrook103450
50.3 cm3 Sept 2001Littlewood Mill103440
49.9 cm4 Sept 2001Allenbrook103450
46.5 cm10 Sept 2002d/s Knightsmill72036
44.5 cm12 Aug 1997Lamellan103672
42.5 cm27 Jun 2000d/s Knightsmill103490
41.5 cm9 Sept 2002Dinhams Bridge72162
41.5 cm29 Aug 2001d/s Knightsmill103435

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
Trehannick17 Jul 198014 Aug 202529
Pengenna25 Jul 202310 Jul 20242
Lamellan27 Jul 198022 Aug 202317
Upstream Littlewood Mill10 Aug 202310 Aug 20231
Hillside10 Aug 202310 Aug 20231
Treforda19 Jun 19857 Aug 202316
Dinhams Bridge25 Jul 198021 Jun 202315
Littlewood Mill27 Jun 198527 Jul 201817
Trehannick Saw Mill (restored)27 Sept 201127 Sept 20111
Trevia16 Jul 198529 Jun 200612
d/s Knightsmill21 Jul 198015 Sept 200313
Lanteglos18 Jul 198011 Sept 200211
u/s Trewen2 Jul 19906 Sept 20018
Allenbrook30 May 20014 Sept 20012
Kestlewood20 Jun 198520 Jul 200010
d/s Trewen10 Sept 19882 Jul 19902

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

1980–2025

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 736 measured fish were spread across different length ranges.

Smallest
6.8 cm
Lower quarter
14.5 cm
Median
20.5 cm
Upper quarter
27.4 cm
Largest
51.5 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 2 european eel. This is a subset of the measured fish and may not represent the whole population.

Lightest
0.7 oz (0.021 kg)
Lower quarter
2.9 oz (0.0808 kg)
Median
5 oz (0.1405 kg)
Upper quarter
7.1 oz (0.2002 kg)
Heaviest
9.2 oz (0.26 kg)

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

More fish in this river

Explore the River Main Allen

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

Brown / sea trout Bullhead Atlantic salmon 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 →