Historic monitoring evidence · Environment Agency
DS Denver Residual Sluice (Eel Monitoring)
East Anglia · 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.
European eels > elvers
Anguilla anguilla- First record
- 18 Jun 2008
- Latest record
- 18 Jun 2014
- Survey events
- 3
Ruffe
Gymnocephalus cernuus- First record
- 24 Jul 2012
- Latest record
- 18 Jun 2014
- Survey events
- 2
Pike
Esox lucius- First record
- 24 Jul 2012
- Latest record
- 18 Jun 2014
- Survey events
- 2
3-spined stickleback
Gasterosteus aculeatus- First record
- 24 Jul 2012
- Latest record
- 18 Jun 2014
- Survey events
- 2
Rudd
Scardinius erythrophthalmus- First record
- 18 Jun 2014
- Latest record
- 18 Jun 2014
- Survey events
- 1
Tench
Tinca tinca- First record
- 18 Jun 2014
- Latest record
- 18 Jun 2014
- Survey events
- 1
Brook lamprey
Lampetra planeri- First record
- 18 Jun 2014
- Latest record
- 18 Jun 2014
- Survey events
- 1
Zander
Sander lucioperca- First record
- 18 Jun 2014
- Latest record
- 18 Jun 2014
- Survey events
- 1
Roach
Rutilus rutilus- First record
- 24 Jul 2012
- Latest record
- 24 Jul 2012
- Survey events
- 1
Perch
Perca fluviatilis- First record
- 24 Jul 2012
- Latest record
- 24 Jul 2012
- Survey events
- 1
Bullhead
Cottus gobio- First record
- 24 Jul 2012
- Latest record
- 24 Jul 2012
- Survey events
- 1
Spined loach
Cobitis taenia- First record
- 24 Jul 2012
- Latest record
- 24 Jul 2012
- Survey events
- 1
European eel
Anguilla anguilla- First record
- 3 Jun 2009
- Latest record
- 20 Jul 2010
- Survey events
- 2
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