European eel · Anguilla anguilla

European eel in the Sandon Brook (Main Reaches)

Largest measured european eel: 60.7 cm

The largest european eel measured in Environment Agency surveys of the Sandon Brook (Main Reaches) was 60.7 cm, recorded at Boreham Bridge (Sandon Brook) on 8 May 2007.

Across 265 measured european eel, the median measured length was 34.7 cm.

Surveyors recorded weights for 265 european eel. The median was 2.4 oz (0.068 kg) and the largest recorded weight was 15.7 oz (0.446 kg).

RiverFish uses Environment Agency survey measurements rather than rod-and-line angling records. These figures show fish measured during EA surveys of the Sandon Brook (Main Reaches).

See european eel records across England →

Most recent observation9 May 2025Boreham Bridge (Sandon Brook) · 9 fish

Largest measured european eel: 60.7 cm
Median length: 34.7 cm
Fish measured: 265
Survey locations: 4

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
60.7 cm	8 May 2007	Boreham Bridge (Sandon Brook)	105398
57.7 cm	10 May 2013	Graces Walk	137520
57.5 cm	9 May 2007	Graces Walk	105385
56.5 cm	8 May 2007	Boreham Bridge (Sandon Brook)	105398
56.1 cm	8 May 2007	Boreham Bridge (Sandon Brook)	105398
55 cm	9 May 2007	Graces Walk	105385
54.9 cm	8 May 2007	Boreham Bridge (Sandon Brook)	105398
54.7 cm	8 May 2025	Graces Walk	177233
54.3 cm	9 May 2007	Graces Walk	105385
53.1 cm	8 May 2007	Boreham Bridge (Sandon Brook)	105398

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
Boreham Bridge (Sandon Brook)	9 May 1986	9 May 2025	9
Graces Walk	15 May 1986	8 May 2025	10
Baddow Fruit Farm	13 May 1986	1 Jun 2001	6
Danbury Road FGS	16 May 1986	29 May 2001	6

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.

486

087

088

489

090

091

492

093

094

495

096

097

498

099

000

401

002

003

004

005

006

207

008

009

010

011

012

213

014

015

016

017

018

119

020

021

022

023

024

225

Fish measured by surveyors

Measured length distribution

See how the 265 measured fish were spread across different length ranges.

Smallest: 11.8 cm
Lower quarter: 26.9 cm
Median: 34.7 cm
Upper quarter: 42.5 cm
Largest: 60.7 cm

100–199 mm

200–299 mm

300–399 mm

400–499 mm

500–599 mm

600–699 mm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 265 european eel. This is a subset of the measured fish and may not represent the whole population.

Lightest: 0 oz (0.0011 kg)
Lower quarter: 1.1 oz (0.03 kg)
Median: 2.4 oz (0.068 kg)
Upper quarter: 4.3 oz (0.122 kg)
Heaviest: 15.7 oz (0.446 kg)

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

More fish in this river

Explore the Sandon Brook (Main Reaches)

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

Chub Roach Dace Pike Gudgeon Minnow

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 →