Historic monitoring evidence · Environment Agency
Great Canfield
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.
Gudgeon
Gobio gobio- First record
- 23 Aug 2002
- Latest record
- 26 Jul 2006
- Survey events
- 5
3-spined stickleback
Gasterosteus aculeatus- First record
- 23 Aug 2002
- Latest record
- 26 Jul 2006
- Survey events
- 4
Roach
Rutilus rutilus- First record
- 26 Jul 2006
- Latest record
- 26 Jul 2006
- Survey events
- 1
Perch
Perca fluviatilis- First record
- 26 Jul 2006
- Latest record
- 26 Jul 2006
- Survey events
- 1
Stone loach
Barbatula barbatula- First record
- 14 Aug 2003
- Latest record
- 29 Jul 2005
- Survey events
- 3
Dace
Leuciscus leuciscus- First record
- 23 Aug 2002
- Latest record
- 10 Aug 2004
- Survey events
- 3
Pike
Esox lucius- First record
- 23 Aug 2002
- Latest record
- 10 Aug 2004
- Survey events
- 3
Bullhead
Cottus gobio- First record
- 14 Aug 2003
- Latest record
- 10 Aug 2004
- Survey events
- 2
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