RiverFish

European eel · Anguilla anguilla

European eel in the River Colnebrook

Largest measured european eel: 93 cm

The largest european eel measured in Environment Agency surveys of the River Colnebrook was 93 cm, recorded at Thorney Golf Course on 31 August 2005.

Across 223 measured european eel, the median measured length was 56 cm.

Surveyors recorded weights for 16 european eel. The median was 9.8 oz (0.2785 kg) and the largest recorded weight was 1 lb 4.4 oz (0.579 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 Colnebrook.

See european eel records across England →

Most recent observation2 June 2026Wraysbury · 1 fish
Largest measured european eel
93 cm
Median length
56 cm
Fish measured
223
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
93 cm31 Aug 2005Thorney Golf Course86581
82 cm8 Jun 2010Thorney Golf Course121849
82 cm12 Jun 2007Thorney Golf Course105525
81 cm18 Jun 2008Thorney Golf Course111358
80 cm4 Jun 2009Thorney Golf Course117314
80 cm18 Jun 2008Thorney Golf Course111358
80 cm12 Jun 2007Thorney Golf Course105525
78 cm21 Aug 2002Thorney Golf Course72408
78 cm21 Aug 2002Thorney Golf Course72408
77 cm20 Nov 2001Hythe End73303

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
Wraysbury3 Jun 20152 Jun 20269
Hythe End20 Nov 20016 Jun 201411
Thorney Golf Course13 May 19866 Jun 201211
Horton Upstream Site24 Apr 201024 Apr 20101
Horton Upstream Backloop24 Apr 201024 Apr 20101
Horton Middle Site23 Apr 201023 Apr 20101
Horton Downstream site23 Apr 201023 Apr 20101
Iver15 May 198615 May 19861

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

1986–2026

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 223 measured fish were spread across different length ranges.

Smallest
5.6 cm
Lower quarter
47 cm
Median
56 cm
Upper quarter
63 cm
Largest
93 cm

Lengths are direct survey measurements rather than anglers’ catches.

Fish weighed by surveyors

Measured weight summary

Recorded weights were available for 16 european eel. This is a subset of the measured fish and may not represent the whole population.

Lightest
1.7 oz (0.049 kg)
Lower quarter
3.5 oz (0.099 kg)
Median
9.8 oz (0.2785 kg)
Upper quarter
12 oz (0.339 kg)
Heaviest
1 lb 4.4 oz (0.579 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 Colnebrook

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

Perch Roach Chub 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 →