Historic monitoring evidence · Environment Agency
River Derwent at Blackhall Mill
North East · 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.
Brown / sea trout
Salmo trutta- First record
- 13 Sept 2004
- Latest record
- 15 Jul 2025
- Survey events
- 14
Bullhead
Cottus gobio- First record
- 13 Sept 2004
- Latest record
- 15 Jul 2025
- Survey events
- 14
Atlantic salmon
Salmo salar- First record
- 3 Sept 2014
- Latest record
- 15 Jul 2025
- Survey events
- 5
European eel
Anguilla anguilla- First record
- 31 Jul 2013
- Latest record
- 15 Jul 2025
- Survey events
- 4
Lamprey sp.
Petromyzontidae- First record
- 30 Jun 2023
- Latest record
- 30 Jun 2023
- Survey events
- 1
Minnow
Phoxinus phoxinus- First record
- 13 Sept 2004
- Latest record
- 9 Sept 2019
- Survey events
- 7
Stone loach
Barbatula barbatula- First record
- 9 Aug 2009
- Latest record
- 9 Sept 2019
- Survey events
- 6
3-spined stickleback
Gasterosteus aculeatus- First record
- 14 Aug 2007
- Latest record
- 17 Aug 2017
- Survey events
- 7
European eels > elvers
Anguilla anguilla- First record
- 9 Aug 2009
- Latest record
- 17 Aug 2017
- Survey events
- 5
European elvers
Anguilla anguilla- First record
- 17 Aug 2017
- Latest record
- 17 Aug 2017
- Survey events
- 1
Grayling
Thymallus thymallus- First record
- 14 Aug 2007
- Latest record
- 11 Oct 2016
- Survey events
- 3
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