Historic monitoring evidence · Environment Agency
Drop 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.
Dace
Leuciscus leuciscus- First record
- 8 Jul 2003
- Latest record
- 23 May 2023
- Survey events
- 12
Chub
Leuciscus cephalus- First record
- 13 Jul 2004
- Latest record
- 23 May 2023
- Survey events
- 11
Gudgeon
Gobio gobio- First record
- 8 Jul 2003
- Latest record
- 23 May 2023
- Survey events
- 11
Perch
Perca fluviatilis- First record
- 8 Jul 2003
- Latest record
- 23 May 2023
- Survey events
- 11
Minnow
Phoxinus phoxinus- First record
- 8 Jul 2003
- Latest record
- 23 May 2023
- Survey events
- 8
Bullhead
Cottus gobio- First record
- 8 Jul 2003
- Latest record
- 23 May 2023
- Survey events
- 6
Pike varieties
Esox lucius- First record
- 21 Jul 2005
- Latest record
- 23 May 2023
- Survey events
- 5
Roach
Rutilus rutilus- First record
- 8 Jul 2003
- Latest record
- 28 Jun 2018
- Survey events
- 11
Pike
Esox lucius- First record
- 8 Jul 2003
- Latest record
- 28 Jun 2018
- Survey events
- 7
Brown / sea trout
Salmo trutta- First record
- 23 May 2012
- Latest record
- 27 May 2015
- Survey events
- 2
Roach x common bream hybrid
Rutilus rutilus x Abramis brama- First record
- 27 May 2015
- Latest record
- 27 May 2015
- Survey events
- 1
3-spined stickleback
Gasterosteus aculeatus- First record
- 25 Jul 2006
- Latest record
- 25 Jul 2006
- Survey events
- 1
Common bream
Abramis brama- First record
- 21 Jul 2005
- Latest record
- 21 Jul 2005
- 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