Updated 7 January 2008
- Adult Caddisfly Occurance Scheme
- APEM Ltd
- Atlantic Salmon Trust
- Biological Records Centre
- Birdsgrove Fly Fishing Club
- Bradan Aquasurveys Ltd.
- British Waterways
- Buglife - The Invertebrate Conservation Trust
- Canterbury and District Angling Association*
- Cardiff University Catchment Research Group
- Clyde River Foundation
- Countryside Council for Wales
- Dan-y-Parc Fishery
- East Yorkshire Chalk Rivers Trust *
- EFE & GB Nets
- Environment Agency
- Ephemeroptera Recording Scheme
- Field Studies Council
- Frensham Fly Fishers *
- Freshwater Biological Association
- FreshwaterLife
- Gresham Angling Society *
- Gwent Angling Society
- Jardine Creative Angling Limited
- JETSET Trout in the classroom UK
- John Spedan Lewis Trust for the Advancement of Natural Sciences*
- Lancaster University Institute of the Environment, Philosophy and Public Policy
- Manchester Anglers Association
- National Trust
- Natural England
- Natural History Museum
- Plecoptera Recording Scheme
- Riverfly Recording Schemes
- Rhymney River Federation of Angling Clubs *
- Salmon and Trout Association
- Solihul Fly Dressers
- Test and Itchen Association Ltd
- Trichoptera Recording Scheme
- Wandle Piscators *
- Wild Trout Trust
- Wiltshire Fishery Association
- Wylye Fly Fishing Club
- Yorkshire Dales Rivers Trust *
