Historic monitoring evidence · Environment Agency
Scotsbridge 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.
Bullhead
Cottus gobio- First record
- 9 Jul 2003
- Latest record
- 10 May 2023
- Survey events
- 7
Brown / sea trout
Salmo trutta- First record
- 9 Jul 2003
- Latest record
- 10 May 2023
- Survey events
- 6
Minnow
Phoxinus phoxinus- First record
- 9 Jul 2003
- Latest record
- 10 May 2023
- Survey events
- 6
Stone loach
Barbatula barbatula- First record
- 9 Jul 2003
- Latest record
- 10 May 2023
- Survey events
- 6
Chub
Leuciscus cephalus- First record
- 9 Jul 2003
- Latest record
- 10 May 2023
- Survey events
- 5
3-spined stickleback
Gasterosteus aculeatus- First record
- 9 Jul 2003
- Latest record
- 10 May 2023
- Survey events
- 5
Gudgeon
Gobio gobio- First record
- 9 Jul 2003
- Latest record
- 10 May 2023
- Survey events
- 4
Dace
Leuciscus leuciscus- First record
- 12 May 2011
- Latest record
- 10 May 2023
- Survey events
- 2
Roach
Rutilus rutilus- First record
- 10 May 2023
- Latest record
- 10 May 2023
- Survey events
- 1
Brook lamprey ammocoetes
Lampetra planeri- First record
- 9 May 2017
- Latest record
- 9 May 2017
- Survey events
- 1
Brook lamprey
Lampetra planeri- First record
- 9 Jul 2003
- Latest record
- 12 May 2011
- Survey events
- 3
Lamprey sp. ammocoetes
Petromyzontidae- First record
- 27 Apr 2006
- Latest record
- 27 Apr 2006
- Survey events
- 1
Brook lamprey > ammocoete
Lampetra planeri- First record
- 5 May 2005
- Latest record
- 5 May 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