Historic monitoring evidence · Environment Agency
Hyde Mill
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.
Barbel
Barbus barbus- First record
- 9 Oct 2002
- Latest record
- 17 Jun 2025
- Survey events
- 14
Chub
Leuciscus cephalus- First record
- 9 Oct 2002
- Latest record
- 17 Jun 2025
- Survey events
- 14
Gudgeon
Gobio gobio- First record
- 9 Sept 2003
- Latest record
- 17 Jun 2025
- Survey events
- 12
Minnow
Phoxinus phoxinus- First record
- 9 Oct 2002
- Latest record
- 17 Jun 2025
- Survey events
- 11
Stone loach
Barbatula barbatula- First record
- 9 Oct 2002
- Latest record
- 17 Jun 2025
- Survey events
- 9
Perch
Perca fluviatilis- First record
- 8 Jul 2008
- Latest record
- 17 Jun 2025
- Survey events
- 8
Common carp varieties
Cyprinus carpio- First record
- 8 Jul 2008
- Latest record
- 17 Jun 2025
- Survey events
- 4
3-spined stickleback
Gasterosteus aculeatus- First record
- 9 Sept 2003
- Latest record
- 17 Jun 2025
- Survey events
- 3
Feral [brown] goldfish
Carassius auratus- First record
- 3 Aug 2022
- Latest record
- 3 Aug 2022
- Survey events
- 1
Common [wild] carp
Cyprinus carpio- First record
- 9 Oct 2002
- Latest record
- 20 Jun 2019
- Survey events
- 6
Koi carp
Cyprinus carpio- First record
- 7 Jul 2016
- Latest record
- 7 Jul 2016
- Survey events
- 1
Roach
Rutilus rutilus- First record
- 9 Sept 2003
- Latest record
- 12 Jul 2010
- Survey events
- 7
10-spined stickleback
Pungitius pungitius- First record
- 18 Aug 2005
- Latest record
- 9 Aug 2007
- Survey events
- 2
European eel
Anguilla anguilla- First record
- 9 Oct 2002
- Latest record
- 8 Aug 2006
- Survey events
- 2
Crucian carp
Carassius carassius- First record
- 18 Aug 2005
- Latest record
- 18 Aug 2005
- Survey events
- 1
European eels > elvers
Anguilla anguilla- First record
- 9 Sept 2003
- Latest record
- 9 Sept 2003
- Survey events
- 1
Mirror carp
Cyprinus carpio- First record
- 9 Oct 2002
- Latest record
- 9 Oct 2002
- 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