Historic monitoring evidence · Environment Agency
Flash Lane
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.
3-spined stickleback
Gasterosteus aculeatus- First record
- 26 Mar 2014
- Latest record
- 11 Oct 2019
- Survey events
- 5
Minnow
Phoxinus phoxinus- First record
- 26 Mar 2014
- Latest record
- 11 Oct 2019
- Survey events
- 5
Gudgeon
Gobio gobio- First record
- 20 Aug 2014
- Latest record
- 11 Oct 2019
- Survey events
- 4
Stone loach
Barbatula barbatula- First record
- 20 Aug 2014
- Latest record
- 11 Oct 2019
- Survey events
- 4
Roach
Rutilus rutilus- First record
- 20 Aug 2014
- Latest record
- 16 Oct 2015
- Survey events
- 3
Bullhead
Cottus gobio- First record
- 10 Apr 2015
- Latest record
- 16 Oct 2015
- Survey events
- 2
Topmouth gudgeon
Pseudorasbora parva- First record
- 26 Mar 2014
- Latest record
- 26 Mar 2014
- 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