Updated 2 December 2009
- Adult Caddisfly Occurrence Scheme
- Angling Trust (including Fish Legal the legal arm of the Angling Trust in England)
- APEM Ltd
- Association of Rivers Trusts
- Atlantic Salmon Trust
- Aquascience
- 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
- Chess Valley Anglers
- 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
- Grayling Society
- 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
- LEAF (Linking Environment and Farming)
- Rivers Lugg and Arrow Fisheries Association*
- Manchester Anglers Association
- National Gamekeepers Organisation
- National Trust
- Natural England
- Natural History Museum
- Neath and Dulais Angling Club
- Plecoptera Recording Scheme
- Portsmouth Services Fly Fishing Association*
- Rivers Lugg and Arrow Fisheries Association
- Riverfly Recording Schemes
- Rhymney River Federation of Angling Clubs *
- Salmon and Trout Association
- Services Dry Fly Fishing Association
- Solihul Fly Dressers
- Swale, Ure & Nidd S&TA Branch AMI Group*
- Teifi Rivers Invertebrate Monitorers*
- Test and Itchen Association Ltd
- Trent Rivers Trust
- Trichoptera Recording Scheme
- Wandle Piscators *
- Wild Trout Trust
- Wilton Fly Fishing Club*
- Wiltshire Fishery Association
- WWF-UK
- Wylye Fly Fishing Club
- Yorkshire Dales Rivers Trust *
