RiverFish

European eel · Anguilla anguilla

European eel in the River Marron

Largest measured european eel: 45 cm

The largest european eel measured in Environment Agency surveys of the River Marron was 45 cm, recorded at 1700.00 Asby, River Marron on 21 July 2023.

Across 381 measured european eel, the median measured length was 15.5 cm.

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

See european eel records across England →

Most recent observation11 August 20251704.00 Calva Hall, River Marron · 7 fish
Largest measured european eel
45 cm
Median length
15.5 cm
Fish measured
381
Survey locations
8

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
45 cm21 Jul 20231700.00 Asby, River Marron162704
45 cm8 Jul 20211704.00 Calva Hall, River Marron160018
45 cm4 Aug 20031700.00 Asby, River Marron78597
44.5 cm1 Sept 20161702.00 Ullock, River Marron149200
42.5 cm23 Jul 20091704.00 Calva Hall, River Marron118712
42.5 cm21 Jul 20061704.00 Calva Hall, River Marron102840
42 cm13 Aug 20101728.00 Lostrigg Beck, River Marron125143
41 cm9 Aug 20181704.00 Calva Hall, River Marron153093
40 cm20 Jul 20231701.00 nr Wright Green, River Marron162713
40 cm9 Aug 20181704.00 Calva Hall, River Marron153093

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
1704.00 Calva Hall, River Marron24 Jul 200211 Aug 202517
1728.00 Lostrigg Beck, River Marron4 Aug 200321 Jul 20237
1700.00 Asby, River Marron4 Aug 200321 Jul 20233
1702.00 Ullock, River Marron23 Jul 200920 Jul 20235
1701.00 nr Wright Green, River Marron4 Aug 200320 Jul 20237
1718.00 Black Beck, River Marron8 Aug 20031 Sept 20164
1715.00 Snary Beck, River Marron13 Aug 20101 Sept 20163
1713.95 Wisenholme Beck near Mill House4 Aug 200313 Aug 20102

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

2002–2025

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 381 measured fish were spread across different length ranges.

Smallest
7 cm
Lower quarter
11 cm
Median
15.5 cm
Upper quarter
25 cm
Largest
45 cm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the River Marron

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

Brown / sea trout Atlantic salmon

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 →