European eel · Anguilla anguilla

European eel in the River Mardyke

Largest measured european eel: 75.3 cm

The largest european eel measured in Environment Agency surveys of the River Mardyke was 75.3 cm, recorded at Grangewater on 23 April 2013.

Across 636 measured european eel, the median measured length was 41 cm.

Surveyors recorded weights for 633 european eel. The median was 4.7 oz (0.134 kg) and the largest recorded weight was 2 lb 5.4 oz (1.06 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 Mardyke.

See european eel records across England →

Most recent observation2 May 2025North Stifford · 65 fish

Largest measured european eel: 75.3 cm
Median length: 41 cm
Fish measured: 636
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.

Length	Survey date	Survey location	Survey ID
75.3 cm	23 Apr 2013	Grangewater	135914
68 cm	14 May 2007	North Stifford	105372
66.8 cm	14 May 2007	North Stifford	105372
66.7 cm	14 May 2007	North Stifford	105372
65 cm	30 May 2019	14 Arches Bridge	155998
63.7 cm	14 May 2007	North Stifford	105372
60.8 cm	30 May 2019	14 Arches Bridge	155998
60.6 cm	14 May 2007	North Stifford	105372
58.6 cm	11 May 2007	Grangewater	105373
57.9 cm	14 May 2007	North Stifford	105372

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 surveyed	First recorded	Last recorded	Visits finding european eel
North Stifford	17 Mar 1986	2 May 2025	10
14 Arches Bridge	14 Apr 1986	30 May 2019	9
Grangewater	17 Apr 1986	23 Apr 2013	8
Circus Tavern	15 Apr 1986	18 May 2007	4
M25-A13	19 Mar 1986	17 May 2007	6
War Department Sluice	16 Apr 1986	19 May 1998	3

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

1986–2025

Survey records by year

Each bar shows how many survey visits recorded european eel that year.

686

087

088

589

090

091

492

093

094

595

096

097

698

099

000

301

002

003

004

005

006

507

008

009

010

011

012

313

014

015

016

017

018

219

020

021

022

023

024

125

Fish measured by surveyors

Measured length distribution

See how the 636 measured fish were spread across different length ranges.

Smallest: 8.7 cm
Lower quarter: 34.5 cm
Median: 41.1 cm
Upper quarter: 47.2 cm
Largest: 75.3 cm

0–99 mm

100–199 mm

200–299 mm

300–399 mm

219

400–499 mm

256

500–599 mm

600–699 mm

700–799 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 633 european eel. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0.2 oz (0.005 kg)
Lower quarter: 2.7 oz (0.076 kg)
Median: 4.7 oz (0.134 kg)
Upper quarter: 7.3 oz (0.208 kg)
Heaviest: 2 lb 5.4 oz (1.06 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 Mardyke

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

3-spined stickleback Roach Rudd Tench Common carp Golden goldfish

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 →