Historic monitoring evidence · Environment Agency
Crowther Nurseries
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
- 3 May 1992
- Latest record
- 2 Jul 2024
- Survey events
- 14
Minnow
Phoxinus phoxinus- First record
- 3 May 1992
- Latest record
- 2 Jul 2024
- Survey events
- 14
Chub
Leuciscus cephalus- First record
- 3 May 1992
- Latest record
- 2 Jul 2024
- Survey events
- 12
Bullhead
Cottus gobio- First record
- 7 Aug 2003
- Latest record
- 2 Jul 2024
- Survey events
- 12
Gudgeon
Gobio gobio- First record
- 3 May 1992
- Latest record
- 2 Jul 2024
- Survey events
- 11
Stone loach
Barbatula barbatula- First record
- 3 May 1992
- Latest record
- 2 Jul 2024
- Survey events
- 11
European eels > elvers
Anguilla anguilla- First record
- 19 Jul 2007
- Latest record
- 2 Jul 2024
- Survey events
- 3
Perch
Perca fluviatilis- First record
- 18 Feb 1999
- Latest record
- 31 Aug 2018
- Survey events
- 13
Dace
Leuciscus leuciscus- First record
- 3 May 1992
- Latest record
- 31 Aug 2018
- Survey events
- 12
Pike
Esox lucius- First record
- 18 Feb 1999
- Latest record
- 31 Aug 2018
- Survey events
- 10
European eel
Anguilla anguilla- First record
- 3 May 1992
- Latest record
- 10 Aug 2015
- Survey events
- 12
3-spined stickleback
Gasterosteus aculeatus- First record
- 7 Aug 2003
- Latest record
- 29 Aug 2012
- Survey events
- 7
Pike varieties
Esox lucius- First record
- 3 May 1992
- Latest record
- 7 Jul 2010
- Survey events
- 5
Tench
Tinca tinca- First record
- 18 Feb 1999
- Latest record
- 7 Aug 2003
- Survey events
- 2
European elvers
Anguilla anguilla- First record
- 7 Aug 2003
- Latest record
- 7 Aug 2003
- Survey events
- 1
Tench varieties
Tinca tinca- First record
- 3 May 1992
- Latest record
- 3 May 1992
- 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