Historic monitoring evidence · Environment Agency
Harmondsworth Moor
Hertfordshire and North London · survey site
This page records ecological survey evidence. It is not proof of current fish presence, abundance, fishing quality, access, permission or safety at this location.
Observed taxa
What monitoring recorded here
Taxa are ordered by latest survey date. Counts and records reflect monitoring events, not an angling forecast.
Chub
Leuciscus cephalus- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 16
Dace
Leuciscus leuciscus- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 16
Gudgeon
Gobio gobio- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 15
Roach
Rutilus rutilus- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 15
Perch
Perca fluviatilis- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 15
Minnow
Phoxinus phoxinus- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 15
Bullhead
Cottus gobio- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 14
Barbel
Barbus barbus- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 13
Pike
Esox lucius- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 10
European eels > elvers
Anguilla anguilla- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 7
Brown / sea trout
Salmo trutta- First record
- 3 Sept 2003
- Latest record
- 15 May 2024
- Survey events
- 5
3-spined stickleback
Gasterosteus aculeatus- First record
- 23 Aug 2006
- Latest record
- 15 May 2024
- Survey events
- 2
Stone loach
Barbatula barbatula- First record
- 3 Sept 2003
- Latest record
- 1 Jun 2023
- Survey events
- 12
Bleak
Alburnus alburnus- First record
- 4 Aug 2004
- Latest record
- 5 Jun 2018
- Survey events
- 7
European eel
Anguilla anguilla- First record
- 4 Aug 2004
- Latest record
- 18 Jun 2015
- Survey events
- 7
Pike varieties
Esox lucius- First record
- 24 Jun 2008
- Latest record
- 21 Jun 2011
- Survey events
- 4
Common bream
Abramis brama- First record
- 23 Jun 2010
- Latest record
- 23 Jun 2010
- Survey events
- 1
Rules and access
Check before you travel.
Environment Agency ecology records do not carry fishing-rights boundaries or live restrictions. Confirm the fishery owner, permission, local byelaws, seasonal rules, safety notices and current conditions before setting out.
Check live freshwater fishing rulesProvenance
Source, licence and boundary
- SourceEnvironment Agency Ecology & Fish Data
- LicenceOpen Government Licence v3.0
- Source copy retrieved23 Jul 2026
- Terms checked23 Jul 2026
- CoverageHistoric monitoring evidence, separately dated per record
- Not assertedCurrent presence, access, permission, fishing quality or safety