Historic monitoring evidence · Environment Agency
Fields Weir
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
- 6 Jun 1992
- Latest record
- 6 Jun 1992
- Survey events
- 1
Ruffe
Gymnocephalus cernuus- First record
- 6 Jun 1992
- Latest record
- 6 Jun 1992
- Survey events
- 1
Tench varieties
Tinca tinca- First record
- 6 Jun 1992
- Latest record
- 6 Jun 1992
- Survey events
- 1
Perch
Perca fluviatilis- First record
- 6 Jun 1992
- Latest record
- 6 Jun 1992
- Survey events
- 1
Pike varieties
Esox lucius- First record
- 6 Jun 1992
- Latest record
- 6 Jun 1992
- Survey events
- 1
European eel
Anguilla anguilla- First record
- 6 Jun 1992
- Latest record
- 6 Jun 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