Historic monitoring evidence · Environment Agency
Days - Benson (Margin)
Thames · 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.
Chub
Leuciscus cephalus- First record
- 24 Sept 1993
- Latest record
- 20 Jul 2025
- Survey events
- 29
Bleak
Alburnus alburnus- First record
- 24 Sept 1993
- Latest record
- 20 Jul 2025
- Survey events
- 29
Roach
Rutilus rutilus- First record
- 24 Sept 1993
- Latest record
- 20 Jul 2025
- Survey events
- 29
Pike
Esox lucius- First record
- 24 Sept 1993
- Latest record
- 20 Jul 2025
- Survey events
- 29
Dace
Leuciscus leuciscus- First record
- 24 Sept 1993
- Latest record
- 20 Jul 2025
- Survey events
- 26
Perch
Perca fluviatilis- First record
- 24 Sept 1993
- Latest record
- 20 Jul 2025
- Survey events
- 26
Common bream
Abramis brama- First record
- 8 Jul 1994
- Latest record
- 20 Jul 2025
- Survey events
- 24
Tench
Tinca tinca- First record
- 24 Sept 1993
- Latest record
- 20 Jul 2025
- Survey events
- 21
Silver bream
Abramis bjoerkna- First record
- 8 Jul 1994
- Latest record
- 14 Jul 2024
- Survey events
- 9
Rudd
Scardinius erythrophthalmus- First record
- 10 Jul 1997
- Latest record
- 14 Jul 2024
- Survey events
- 2
Brown / sea trout
Salmo trutta- First record
- 14 Jul 2024
- Latest record
- 14 Jul 2024
- Survey events
- 1
Barbel
Barbus barbus- First record
- 13 Jul 2006
- Latest record
- 24 Jul 2023
- Survey events
- 2
Gudgeon
Gobio gobio- First record
- 24 Sept 1993
- Latest record
- 7 Jul 2016
- Survey events
- 17
Ruffe
Gymnocephalus cernuus- First record
- 18 Jul 2008
- Latest record
- 19 Jul 2015
- Survey events
- 3
Common carp varieties
Cyprinus carpio- First record
- 6 Jul 2000
- Latest record
- 25 Jul 2012
- Survey events
- 4
European eel
Anguilla anguilla- First record
- 8 Jul 1994
- Latest record
- 18 Jul 2011
- Survey events
- 5
European eels > elvers
Anguilla anguilla- First record
- 13 Jul 2006
- Latest record
- 13 Jul 2006
- Survey events
- 1
Mirror carp
Cyprinus carpio- First record
- 11 Jul 2004
- Latest record
- 11 Jul 2004
- 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