Historic monitoring evidence · Environment Agency
Hollycross Road
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.
Brown / sea trout
Salmo trutta- First record
- 22 Oct 2007
- Latest record
- 19 Sept 2023
- Survey events
- 12
Bullhead
Cottus gobio- First record
- 22 Oct 2007
- Latest record
- 19 Sept 2023
- Survey events
- 12
Minnow
Phoxinus phoxinus- First record
- 22 Oct 2007
- Latest record
- 19 Sept 2023
- Survey events
- 12
Chub
Leuciscus cephalus- First record
- 22 Oct 2007
- Latest record
- 19 Sept 2023
- Survey events
- 11
Perch
Perca fluviatilis- First record
- 22 Oct 2007
- Latest record
- 19 Sept 2023
- Survey events
- 11
Stone loach
Barbatula barbatula- First record
- 22 Oct 2007
- Latest record
- 19 Sept 2023
- Survey events
- 9
Gudgeon
Gobio gobio- First record
- 15 Sept 2010
- Latest record
- 19 Sept 2023
- Survey events
- 7
Roach
Rutilus rutilus- First record
- 9 Oct 2009
- Latest record
- 19 Sept 2023
- Survey events
- 7
Dace
Leuciscus leuciscus- First record
- 22 Sept 2012
- Latest record
- 19 Sept 2023
- Survey events
- 4
Brook lamprey
Lampetra planeri- First record
- 22 Oct 2007
- Latest record
- 4 Nov 2021
- Survey events
- 5
Pike
Esox lucius- First record
- 18 Sept 2013
- Latest record
- 12 Sept 2019
- Survey events
- 3
Brook lamprey > ammocoete
Lampetra planeri- First record
- 10 Oct 2017
- Latest record
- 10 Oct 2017
- Survey events
- 1
Pike varieties
Esox lucius- First record
- 22 Oct 2007
- Latest record
- 15 Sept 2011
- Survey events
- 4
Grayling
Thymallus thymallus- First record
- 15 Sept 2010
- Latest record
- 15 Sept 2010
- Survey events
- 1
Lamprey sp.
Petromyzontidae- First record
- 15 Sept 2010
- Latest record
- 15 Sept 2010
- 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