Historic monitoring evidence · Environment Agency
Flour Mills Loop
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.
Roach
Rutilus rutilus- First record
- 11 Feb 1993
- Latest record
- 1 Jul 2009
- Survey events
- 5
Perch
Perca fluviatilis- First record
- 25 Sept 2003
- Latest record
- 1 Jul 2009
- Survey events
- 5
European eel
Anguilla anguilla- First record
- 11 Feb 1993
- Latest record
- 1 Jul 2009
- Survey events
- 4
Tench varieties
Tinca tinca- First record
- 11 Feb 1993
- Latest record
- 1 Jul 2009
- Survey events
- 2
Pike varieties
Esox lucius- First record
- 11 Feb 1993
- Latest record
- 1 Jul 2009
- Survey events
- 2
Tench
Tinca tinca- First record
- 25 Sept 2003
- Latest record
- 12 Sept 2006
- Survey events
- 4
European eels > elvers
Anguilla anguilla- First record
- 25 Sept 2003
- Latest record
- 12 Sept 2006
- Survey events
- 2
Pike
Esox lucius- First record
- 25 Sept 2003
- Latest record
- 11 Nov 2004
- Survey events
- 3
Bleak
Alburnus alburnus- First record
- 25 Sept 2003
- Latest record
- 11 Nov 2004
- Survey events
- 2
Gudgeon
Gobio gobio- First record
- 25 Sept 2003
- Latest record
- 11 Nov 2004
- Survey events
- 2
Common bream
Abramis brama- First record
- 11 Feb 1993
- Latest record
- 1 Oct 2004
- Survey events
- 3
Common carp varieties
Cyprinus carpio- First record
- 25 Sept 2003
- Latest record
- 25 Sept 2003
- 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