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 |
|---|---|---|---|
| 92 cm | 23 Jul 2003 | Uxbridge | 76533 |
| 90 cm | 3 Aug 2010 | Denham | 123197 |
| 88 cm | 11 Jun 2007 | Uxbridge | 105526 |
| 86 cm | 28 Jul 2005 | Uxbridge | 85239 |
| 85 cm | 3 Jul 2004 | Springwell Lane | 81495 |
| 85 cm | 20 Aug 2002 | Uxbridge | 72039 |
| 84 cm | 30 Sept 2014 | u/s West Drayton Mill | 143181 |
| 84 cm | 3 Aug 2010 | Denham | 123197 |
| 83 cm | 28 Jul 2004 | Uxbridge | 80753 |
| 82.6 cm | 31 Oct 2019 | Heathrow EP: Little Britain | 155857 |
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 |
|---|---|---|---|
| Springwell Lane | 11 Feb 1986 | 15 Jun 2026 | 9 |
| Stanwell Moor | 6 Mar 1986 | 28 May 2026 | 19 |
| Uxbridge | 29 Mar 1999 | 4 Jul 2024 | 16 |
| Heathrow EP: Little Britain | 31 Oct 2019 | 31 Oct 2019 | 1 |
| Heathrow EP: Poyle Channel | 28 Oct 2019 | 28 Oct 2019 | 1 |
| Denham 2.0 | 19 Jul 2018 | 19 Jul 2018 | 1 |
| u/s West Drayton Mill | 30 Sept 2014 | 30 Sept 2014 | 1 |
| Denham | 1 Dec 2004 | 26 Jun 2012 | 7 |
| Longbridge Way, Uxbridge | 29 May 2012 | 29 May 2012 | 1 |
| Cowley, Old Mill Lane | 19 May 2009 | 19 May 2009 | 1 |
| Harefield Road | 17 Jun 1986 | 17 Jun 1986 | 1 |
| Cricketfield Lane | 16 May 1986 | 16 May 1986 | 1 |
| Stanwell Road | 8 May 1986 | 8 May 1986 | 1 |
| Poyle Channel | 7 May 1986 | 7 May 1986 | 1 |
| Staines Moor | 13 Mar 1986 | 13 Mar 1986 | 1 |
| Moor roundabout 2 | 12 Mar 1986 | 12 Mar 1986 | 1 |
| Moor Roundabout | 4 Mar 1986 | 12 Mar 1986 | 2 |
| Packetboat Lane | 27 Feb 1986 | 27 Feb 1986 | 1 |
| Uxbridge Moor | 26 Feb 1986 | 26 Feb 1986 | 1 |
| Milupa Factory | 20 Feb 1986 | 20 Feb 1986 | 1 |
| Denham Court | 19 Feb 1986 | 19 Feb 1986 | 1 |
| Troy House | 18 Feb 1986 | 18 Feb 1986 | 1 |
| Maple Cross | 12 Feb 1986 | 12 Feb 1986 | 1 |
| Mill End | 11 Feb 1986 | 11 Feb 1986 | 1 |
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 330 measured fish were spread across different length ranges.
- Smallest
- 4.8 cm
- Lower quarter
- 43.2 cm
- Median
- 55.5 cm
- Upper quarter
- 66 cm
- Largest
- 92 cm
Lengths are direct survey measurements rather than anglers’ catches.
Fish weighed by surveyors
Measured weight summary
Recorded weights were available for 158 european eel. This is a subset of the measured fish and may not represent the whole population.
- Lightest
- 0.4 oz (0.011 kg)
- Lower quarter
- 4.2 oz (0.1192 kg)
- Median
- 8.4 oz (0.237 kg)
- Upper quarter
- 14.9 oz (0.4218 kg)
- Heaviest
- 4 lb 1.3 oz (1.85 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 Colne
Compare other species with enough survey and measurement data for a detailed page.
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 →