ARAnglerRadar evidence & rules

Thymallus thymallus · England

Where grayling has been recorded

Environment Agency surveys have recorded grayling at 1,196 sites across 270 waters, between 1978 and 2026. These are monitoring records with dates. They do not establish what is present today, nor that you may fish for it.

Waters

Rivers with the most records

Ordered by how many surveyed sites on each water recorded it. Waters with their own page are linked.

  1. Test49 siteslatest 15 Sept 2025
  2. River Tees (North East)43 siteslatest 9 Oct 2025
  3. Main Avon Sites (Wessex)30 siteslatest 29 Sept 2025
  4. Main river sites28 siteslatest 18 Sept 2025
  5. Itchen (Solent and South Downs)25 siteslatest 5 Sept 2025
  6. River Don25 siteslatest 12 Aug 2025
  7. River Swale (Yorkshire)24 siteslatest 7 Aug 2025
  8. River Wear (North East)24 siteslatest 4 Sept 2025
  9. River Kennet21 siteslatest 9 Oct 2025
  10. River Dove (West Midlands)20 siteslatest 9 Sept 2025
  11. Lugg19 siteslatest 27 Sept 2022
  12. Main Tamar19 siteslatest 6 Aug 2025
  13. River Teme19 siteslatest 7 Aug 2025
  14. River Ure (Yorkshire)19 siteslatest 16 Jul 2025
  15. River Churnet18 siteslatest 29 Jul 2025
  16. River Wharfe (Yorkshire)18 siteslatest 22 Aug 2024
  17. River Goyt17 siteslatest 10 Sept 2025
  18. River Nidd (Yorkshire)17 siteslatest 8 Jul 2025
  19. River Wylye17 siteslatest 10 Sept 2025
  20. Derwent (East Midlands)16 siteslatest 29 Sept 2025
  21. River Nadder16 siteslatest 30 Jul 2025
  22. River Derwent (Yorkshire)14 siteslatest 17 Aug 2022
  23. Rye salmon riffles13 siteslatest 20 Aug 2025
  24. Gwash12 siteslatest 17 Aug 2023
  25. River Hull12 siteslatest 7 Oct 2025
  26. River Calder11 siteslatest 29 Aug 2025
  27. River Perry11 siteslatest 18 Aug 2023
  28. Main River Exe10 siteslatest 16 Sept 2022
  29. Main River Tone10 siteslatest 30 Sept 2025
  30. River Lambourn10 siteslatest 21 Oct 2025
  31. Great Eau Riffles9 siteslatest 27 Sept 1995
  32. Mimram9 siteslatest 25 Sept 2025
  33. River Aire (Yorkshire)9 siteslatest 30 Jun 2026
  34. Witham Claypole (upper) Subcatchment9 siteslatest 13 Nov 2025
  35. River Manifold8 siteslatest 25 Sept 2025
  36. River Clun8 siteslatest 14 Aug 2025
  37. River Derwent (Cumbria and Lancashire)8 siteslatest 14 Jul 2025
  38. Chess7 siteslatest 7 Oct 2025
  39. Cod Beck7 siteslatest 28 Sept 2022
  40. Hamble7 siteslatest 18 Jun 2009
  41. Main Inny7 siteslatest 26 Aug 2021
  42. River Tean7 siteslatest 4 Oct 2018
  43. River Colne (Yorkshire)7 siteslatest 27 Aug 2025
  44. River Rye7 siteslatest 20 Aug 2025
  45. Western Rother (Solent and South Downs)7 siteslatest 16 Jun 2026
  46. Gayton Brook6 siteslatest 14 Sept 2021
  47. Main Lyd (Devon and Cornwall and the Isles of Scilly)6 siteslatest 7 Jul 2025
  48. Main Ottery6 siteslatest 20 Jul 2021
  49. Rea Brook (Shrops)6 siteslatest 3 Jul 2025
  50. River Allen (Wessex)6 siteslatest 29 Jul 2025
  51. River Ebble6 siteslatest 30 Jul 2024
  52. River Little Avon6 siteslatest 13 Aug 2024
  53. River Windrush6 siteslatest 7 Oct 2025
  54. Yedingham (Straightened Derwent project)6 siteslatest 18 Aug 2016
  55. Anton5 siteslatest 29 Sept 2016
  56. Arrow (West Midlands)5 siteslatest 1 Sept 2014
  57. Bentley Brook5 siteslatest 25 Aug 2015
  58. Bedale Beck5 siteslatest 15 Sept 2016
  59. Costa Beck5 siteslatest 30 Aug 2023
  60. Costa Beck 2011 Project sites5 siteslatest 4 Oct 2013
  61. Great Eau FMU5 siteslatest 1 Jun 2022
  62. Medway - main river5 siteslatest 23 Oct 2025
  63. Meon5 siteslatest 1 Aug 2023
  64. River Bourne (Wessex)5 siteslatest 15 Oct 2024
  65. River Onny5 siteslatest 10 Sept 2025
  66. River Pang5 siteslatest 23 Sept 2025
  67. River Roden5 siteslatest 10 May 2022
  68. Warwickshire Avon5 siteslatest 10 Jul 2014
  69. Ash (Hertfordshire and North London)4 siteslatest 18 Sept 2025
  70. Blackwater (Solent and South Downs)4 siteslatest 15 Sept 2022
  71. Bollin4 siteslatest 23 Jul 2025
  72. Camlad4 siteslatest 22 Apr 2004
  73. Dever4 siteslatest 19 Jul 2012
  74. Henmore Book4 siteslatest 6 May 1998
  75. Lee (Hertfordshire and North London)4 siteslatest 31 Jul 2025
  76. Main Carey4 siteslatest 17 Jun 2022
  77. Main Haddeo4 siteslatest 13 Jul 2022
  78. Nar4 siteslatest 1 Apr 2026
  79. North Stream4 siteslatest 17 Sept 2025
  80. Peover Eye4 siteslatest 27 Jun 2024

Distribution

By ecology region

  • Yorkshire278 sites
  • West Midlands211 sites
  • Wessex164 sites
  • Solent and South Downs122 sites
  • North East97 sites
  • Devon and Cornwall and the Isles of Scilly71 sites
  • Thames61 sites
  • Lincolnshire and Northamptonshire47 sites
  • Greater Manchester Merseyside and Cheshire35 sites
  • Hertfordshire and North London32 sites
  • Cumbria and Lancashire32 sites
  • East Midlands28 sites
  • East Anglia12 sites
  • Kent, South London and East Sussex6 sites

Regions are the Environment Agency’s own ecology areas. Survey effort is not even across them, so a higher count can reflect more monitoring rather than more fish.

Provenance

Source and licence

  • SourceEnvironment Agency Ecology & Fish Data
  • LicenceOpen Government Licence v3.0
  • Source copy retrieved23 Jul 2026
  • Not assertedCurrent presence, abundance, access, permission or fishing quality
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