Monitoring has recorded 20 species across 26 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.
01 · Identity
River Nadder
EA ecology area
Wessex
Waterbody IDs
GB108043015880 · GB108043016200 · GB108043022470
Catchments
Avon (Hampshire)
02 · Survey breadth
26 sites · 104 events
20 positive taxa aggregates are shown. More survey coverage is not a fishing-quality verdict.
03 · Freshness by site
Latest 30 Jul 2025
Within 2 years
2 sites
3–5 years
11 sites
6–10 years
4 sites
Older
9 sites
04 · Trip constraints
Permission is not established
Survey evidence carries no access boundary, permit, opening status, catch forecast or live safety signal. Resolve each before travelling.
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.