European eel · Anguilla anguilla

European eel in the Colly Brook

Largest measured european eel: 56 cm

The largest european eel measured in Environment Agency surveys of the Colly Brook was 56 cm, recorded at Colly Brook on 6 June 2022.

Across 162 measured european eel, the median measured length was 28.5 cm.

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

See european eel records across England →

Most recent observation4 June 2024Colly Brook · 2 fish

Largest measured european eel: 56 cm
Median length: 28.5 cm
Fish measured: 162
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
56 cm	6 Jun 2022	Colly Brook	161498
55 cm	24 Jun 2008	Colly Brook	111491
51 cm	6 Jun 2018	Colly Brook	153000
51 cm	19 Jun 2006	Colly Brook	100627
51 cm	1 Jul 1998	Colly Brook	104767
49 cm	4 Jun 2024	Colly Brook	165214
49 cm	19 Jun 2006	Colly Brook	100627
48.5 cm	6 Jul 1999	Colly Brook	104747
48 cm	4 Jul 2005	Colly Brook	85494
47.5 cm	16 Jul 2002	Colly Brook	72512

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
Colly Brook	21 Jul 1983	4 Jun 2024	19

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

1983–2024

Survey records by year

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

183

084

085

086

087

088

089

090

091

092

093

094

095

096

097

198

199

100

001

102

103

104

105

106

107

108

109

110

011

112

013

114

015

116

017

118

019

020

021

122

023

124

Fish measured by surveyors

Measured length distribution

See how the 162 measured fish were spread across different length ranges.

Smallest: 10 cm
Lower quarter: 22.6 cm
Median: 28.5 cm
Upper quarter: 33.9 cm
Largest: 56 cm

100–199 mm

200–299 mm

300–399 mm

400–499 mm

500–599 mm

Lengths are direct survey measurements rather than anglers’ catches.

More fish in this river

Explore the Colly Brook

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 →