Hertfordshire and North London · Environment Agency surveys
What fish are in the Colne (Hertfordshire and North London)?
Monitoring has recorded 31 species across 37 surveyed sites on this water, between 1986 and 2026. These are survey records with dates. They do not establish what is present today, that the water is fishable, or that you have permission to fish it.
Recorded species
What monitoring has found here
Ordered by how many sites on this water recorded the species. A species not listed has not been recorded by these surveys — which is not the same as being absent.
- ChubLeuciscus cephalus34 siteslatest 15 Jun 2026
- PerchPerca fluviatilis34 siteslatest 15 Jun 2026
- RoachRutilus rutilus32 siteslatest 15 Jun 2026
- DaceLeuciscus leuciscus29 siteslatest 15 Jun 2026
- GudgeonGobio gobio29 siteslatest 15 Jun 2026
- European eelAnguilla anguilla20 siteslatest 12 Jun 2017
- Pike varietiesEsox lucius20 siteslatest 23 May 2023
- PikeEsox lucius18 siteslatest 14 May 2026
- BleakAlburnus alburnus15 siteslatest 4 Jul 2024
- BullheadCottus gobio15 siteslatest 15 Jun 2026
- Common breamAbramis brama15 siteslatest 24 Jul 2025
- BarbelBarbus barbus12 siteslatest 15 Jun 2026
- Brown / sea troutSalmo trutta10 siteslatest 15 Jun 2026
- European eels > elversAnguilla anguilla8 siteslatest 15 Jun 2026
- MinnowPhoxinus phoxinus8 siteslatest 15 Jun 2026
- Roach x common bream hybridRutilus rutilus x Abramis brama8 siteslatest 12 Jun 2017
- 3-spined sticklebackGasterosteus aculeatus7 siteslatest 24 Jul 2025
- TenchTinca tinca5 siteslatest 12 Jun 2025
- Tench varietiesTinca tinca5 siteslatest 5 Jul 2017
- RuffeGymnocephalus cernuus4 siteslatest 1 Aug 2022
- Silver breamAbramis bjoerkna4 siteslatest 27 Jun 2024
- Common [wild] carpCyprinus carpio3 siteslatest 24 Sept 2013
- Mirror carpCyprinus carpio3 siteslatest 20 Jun 2024
- GraylingThymallus thymallus2 siteslatest 28 May 2009
- Stone loachBarbatula barbatula2 siteslatest 22 Jul 2025
- 10-spined sticklebackPungitius pungitius1 sitelatest 16 Apr 2026
- Bleak x roach hybridAlburnus alburnus x Rutilus rutilus1 sitelatest 20 May 2015
- Brook lampreyLampetra planeri1 sitelatest 30 May 2012
- Common carp varietiesCyprinus carpio1 sitelatest 20 May 2010
- Roach x silver bream hybridRutilus rutilus x Abramis bjoerkna1 sitelatest 22 Nov 2001
- RuddScardinius erythrophthalmus1 sitelatest 24 Jul 2012
Surveyed sites on this water
37 shown, newest survey first
Springwell Lane
- Survey events
- 25
- Observed taxa
- 24
- Latest survey
- 15 Jun 2026
Wall Hall
- Survey events
- 21
- Observed taxa
- 18
- Latest survey
- 14 May 2026
Colney Heath
- Survey events
- 3
- Observed taxa
- 6
- Latest survey
- 16 Apr 2026
Uxbridge
- Survey events
- 20
- Observed taxa
- 20
- Latest survey
- 24 Jul 2025
Watford M1 link road
- Survey events
- 19
- Observed taxa
- 15
- Latest survey
- 22 Jul 2025
Stanwell Moor
- Survey events
- 22
- Observed taxa
- 15
- Latest survey
- 10 Jun 2025
Drop Lane
- Survey events
- 12
- Observed taxa
- 13
- Latest survey
- 23 May 2023
Lairage Land
- Survey events
- 1
- Observed taxa
- 4
- Latest survey
- 26 Jul 2022
Watford Tesco Extra
- Survey events
- 1
- Observed taxa
- 5
- Latest survey
- 26 Jul 2022
Heathrow EP: Little Britain
- Survey events
- 1
- Observed taxa
- 9
- Latest survey
- 31 Oct 2019
Heathrow EP: Poyle Channel
- Survey events
- 1
- Observed taxa
- 9
- Latest survey
- 28 Oct 2019
Denham 2.0
- Survey events
- 1
- Observed taxa
- 6
- Latest survey
- 19 Jul 2018
The Withey Beds
- Survey events
- 2
- Observed taxa
- 11
- Latest survey
- 15 May 2017
Merchant Taylor
- Survey events
- 4
- Observed taxa
- 8
- Latest survey
- 21 Sept 2015
Merchant Taylors CPUE
- Survey events
- 1
- Observed taxa
- 6
- Latest survey
- 21 Sept 2015
Denham
- Survey events
- 11
- Observed taxa
- 20
- Latest survey
- 16 Jul 2015
u/s West Drayton Mill
- Survey events
- 2
- Observed taxa
- 11
- Latest survey
- 30 Sept 2014
Merchant Taylor Backwater
- Survey events
- 1
- Observed taxa
- 8
- Latest survey
- 16 Sept 2013
Longbridge Way, Uxbridge
- Survey events
- 1
- Observed taxa
- 8
- Latest survey
- 29 May 2012
Cowley, Old Mill Lane
- Survey events
- 1
- Observed taxa
- 6
- Latest survey
- 19 May 2009
Elms Lake
- Survey events
- 1
- Observed taxa
- 8
- Latest survey
- 19 Feb 2004
Harefield Road
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 17 Jun 1986
Old Mill Lane
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 12 Jun 1986
Cricketfield Lane
- Survey events
- 1
- Observed taxa
- 5
- Latest survey
- 16 May 1986
Stanwell Road
- Survey events
- 1
- Observed taxa
- 11
- Latest survey
- 8 May 1986
Poyle Channel
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 7 May 1986
Staines Moor
- Survey events
- 1
- Observed taxa
- 6
- Latest survey
- 13 Mar 1986
Moor Roundabout
- Survey events
- 2
- Observed taxa
- 9
- Latest survey
- 12 Mar 1986
Moor roundabout 2
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 12 Mar 1986
Staines
- Survey events
- 1
- Observed taxa
- 4
- Latest survey
- 11 Mar 1986
Packetboat Lane
- Survey events
- 1
- Observed taxa
- 8
- Latest survey
- 27 Feb 1986
Uxbridge Moor
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 26 Feb 1986
Milupa Factory
- Survey events
- 1
- Observed taxa
- 8
- Latest survey
- 20 Feb 1986
Denham Court
- Survey events
- 1
- Observed taxa
- 8
- Latest survey
- 19 Feb 1986
Troy House
- Survey events
- 1
- Observed taxa
- 3
- Latest survey
- 18 Feb 1986
Maple Cross
- Survey events
- 1
- Observed taxa
- 14
- Latest survey
- 12 Feb 1986
Mill End
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 11 Feb 1986
Provenance
Source and licence
- SourceEnvironment Agency Ecology & Fish Data
- LicenceOpen Government Licence v3.0
- Source copy retrieved23 Jul 2026
- Waterbody nameAs published by the Environment Agency
- Not assertedCurrent presence, access, permission, fishing quality or safety