European eel · Anguilla anguilla

European eel in the Trewalder Stream

Largest measured european eel: 34.4 cm

The largest european eel measured in Environment Agency surveys of the Trewalder Stream was 34.4 cm, recorded at Trewalder on 5 September 2001.

Across 18 measured european eel, the median measured length was 18 cm.

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

See european eel records across England →

Most recent observation18 July 2023Trewalder · 2 fish

Largest measured european eel: 34.4 cm
Median length: 18 cm
Fish measured: 18
Survey locations: 1

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
34.4 cm	5 Sept 2001	Trewalder	103453
30.1 cm	13 Aug 1997	Trewalder	103676
28 cm	14 Jul 1999	Trewalder	103511
25.1 cm	5 Sept 2001	Trewalder	103453
25 cm	18 Jul 2017	Trewalder	150984
23 cm	18 Jul 2023	Trewalder	162806
23 cm	18 Jul 2023	Trewalder	162806
20.5 cm	18 Jun 1998	Trewalder	103606
18 cm	12 Sept 2002	Trewalder	72166
18 cm	23 Jun 2000	Trewalder	103499

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
Trewalder	16 Jul 1985	18 Jul 2023	14

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

1985–2023

Survey records by year

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

185

086

087

188

089

190

191

092

093

194

095

096

197

198

199

100

101

102

003

004

005

006

007

008

009

010

111

012

013

014

015

016

117

018

019

020

021

022

123

Fish measured by surveyors

Measured length distribution

See how the 18 measured fish were spread across different length ranges.

Smallest: 11 cm
Lower quarter: 14.6 cm
Median: 18 cm
Upper quarter: 24.5 cm
Largest: 34.4 cm

100–199 mm

200–299 mm

300–399 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Trewalder Stream

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

Brown / sea trout

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 →