Ash (Hertfordshire and North London)
- EA ecology area
- Hertfordshire and North London
- Waterbody IDs
- GB106038033290
- Catchments
- Lee
Ash fishing evidence · Hertfordshire and North London
What fish are in the Ash (Hertfordshire and North London)?
Monitoring has recorded 20 species across 13 surveyed sites on this water, between 2003 and 2025. 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.
River evidence passport
Four signals, kept deliberately separate.
The passport shows identity, survey breadth, evidence freshness and trip constraints without turning unlike facts into an opaque “best river” score.
13 sites · 50 events
20 positive taxa aggregates are shown. More survey coverage is not a fishing-quality verdict.
Latest 18 Sept 2025
- Within 2 years
- 2 sites
- 3–5 years
- 1 sites
- 6–10 years
- 2 sites
- Older
- 8 sites
Permission is not established
Survey evidence carries no access boundary, permit, opening status, catch forecast or live safety signal. Resolve each before travelling.
Search current river conditions & alerts → Compare this evidence with another river → England coarse close season →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.
- Brown / sea troutSalmo trutta13 siteslatest 18 Sept 2025
- BullheadCottus gobio12 siteslatest 18 Sept 2025
- MinnowPhoxinus phoxinus11 siteslatest 18 Sept 2025
- 3-spined sticklebackGasterosteus aculeatus9 siteslatest 18 Sept 2025
- Brook lampreyLampetra planeri6 siteslatest 18 Sept 2025
- Stone loachBarbatula barbatula6 siteslatest 18 Sept 2025
- Lamprey sp.Petromyzontidae5 siteslatest 15 Sept 2010
- RoachRutilus rutilus5 siteslatest 19 Sept 2023
- Brook lamprey > ammocoeteLampetra planeri4 siteslatest 29 Oct 2021
- GraylingThymallus thymallus4 siteslatest 18 Sept 2025
- PerchPerca fluviatilis4 siteslatest 19 Sept 2023
- ChubLeuciscus cephalus3 siteslatest 28 Sept 2023
- PikeEsox lucius3 siteslatest 12 Sept 2019
- Pike varietiesEsox lucius3 siteslatest 15 Sept 2011
- Brook lamprey ammocoetesLampetra planeri2 siteslatest 22 Oct 2021
- DaceLeuciscus leuciscus2 siteslatest 28 Sept 2023
- GudgeonGobio gobio2 siteslatest 19 Sept 2023
- 10-spined sticklebackPungitius pungitius1 sitelatest 16 Oct 2007
- Rainbow troutOncorhynchus mykiss1 sitelatest 22 Jun 2006
- TenchTinca tinca1 sitelatest 29 Oct 2021
Surveyed sites on this water
13 shown, newest survey first
Wareside Fully Quantitative
- Survey events
- 8
- Observed taxa
- 8
- Latest survey
- 18 Sept 2025
Watersplace Farm
- Survey events
- 16
- Observed taxa
- 19
- Latest survey
- 18 Sept 2025
Hollycross Road
- Survey events
- 12
- Observed taxa
- 15
- Latest survey
- 19 Sept 2023
Much Hadham Fully Quantitative
- Survey events
- 2
- Observed taxa
- 1
- Latest survey
- 9 Oct 2018
Wareside
- Survey events
- 2
- Observed taxa
- 7
- Latest survey
- 18 Sept 2018
Easeneye Weir Removal
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 23 Oct 2007
Much Hadham
- Survey events
- 1
- Observed taxa
- 4
- Latest survey
- 30 Jun 2006
U/S Blakeswere Widford
- Survey events
- 1
- Observed taxa
- 5
- Latest survey
- 29 Jun 2006
Holly cross rd/water place farm
- Survey events
- 1
- Observed taxa
- 8
- Latest survey
- 22 Jun 2006
Blakesware estate enhancement downstream
- Survey events
- 2
- Observed taxa
- 7
- Latest survey
- 7 Jun 2005
Blakesware estate enhancement upstream
- Survey events
- 2
- Observed taxa
- 4
- Latest survey
- 7 Jun 2005
u/s Ford Waterplace Farm
- Survey events
- 1
- Observed taxa
- 5
- Latest survey
- 19 Nov 2003
Blakesware Estate
- Survey events
- 1
- Observed taxa
- 7
- Latest survey
- 13 Oct 2003
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