ARAnglerRadar evidence & rules

Platichthys flesus · England

Where flounder has been recorded

Environment Agency surveys have recorded flounder at 645 sites across 276 waters, between 1976 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. Tidal Yare29 siteslatest 19 Mar 2010
  2. Barton Broad13 siteslatest 29 Jul 2005
  3. Tidal Waveney13 siteslatest 5 Oct 1999
  4. Hickling Broad12 siteslatest 11 Feb 2015
  5. Relief Channel (East Anglia)12 siteslatest 24 Aug 2005
  6. River Lostock10 siteslatest 25 Jul 2018
  7. Horsey Mere9 siteslatest 1 Sept 2005
  8. Tidal Bure8 siteslatest 31 Jan 1996
  9. South Forty Foot Drain7 siteslatest 18 Sept 2012
  10. Thurne (Seine)7 siteslatest 15 Oct 1998
  11. Great Ouse (Brampton to Earith)6 siteslatest 9 Nov 2007
  12. Lower Parrett Dredge Surveys6 siteslatest 8 Aug 2014
  13. R.Ancholme Subcatchments6 siteslatest 12 Jul 2002
  14. Ranworth Broad6 siteslatest 16 Aug 1999
  15. River Alt6 siteslatest 1 May 2026
  16. River Hull6 siteslatest 21 Sept 2016
  17. River Ouse (Yorkshire)6 siteslatest 7 Aug 2025
  18. Savick Brook6 siteslatest 30 May 2001
  19. South Holland Main Drain6 siteslatest 28 Apr 2016
  20. South Walsham Broad6 siteslatest 24 Aug 1999
  21. Gowy5 siteslatest 25 Apr 2014
  22. Heigham Sound5 siteslatest 18 Sept 1998
  23. Holland Brook (Main Reaches)5 siteslatest 4 Nov 2014
  24. Lincolnshire Lakes5 siteslatest 21 Jan 1998
  25. Mardyke5 siteslatest 18 May 2007
  26. River Hull eel surveys5 siteslatest 2 Jun 2025
  27. River Wharfe (Yorkshire)5 siteslatest 20 Aug 2024
  28. River Wyre5 siteslatest 25 Jul 2016
  29. Roding5 siteslatest 23 Jul 2024
  30. Tidal Ant5 siteslatest 9 Aug 2000
  31. Woldgrift Subcatchment5 siteslatest 21 Nov 2013
  32. Delph4 siteslatest 27 May 2011
  33. Great Eau FMU4 siteslatest 1 Jun 2015
  34. Idle4 siteslatest 4 May 2011
  35. Main Avon Sites (Wessex)4 siteslatest 15 Aug 2024
  36. Main River Axe (Devon and Cornwall and the Isles of Scilly)4 siteslatest 20 May 2024
  37. Main River Parrett4 siteslatest 6 Aug 2019
  38. New Cut4 siteslatest 5 Oct 1987
  39. Northern Burns4 siteslatest 25 Sept 2017
  40. Oulton Broad4 siteslatest 12 Aug 1991
  41. Peakirk downstream4 siteslatest 24 Sept 1996
  42. River Chelt4 siteslatest 3 Sept 2015
  43. River Derwent (Yorkshire)4 siteslatest 21 Jul 2015
  44. River Douglas4 siteslatest 21 Sept 2016
  45. River Leadon4 siteslatest 6 Sept 2012
  46. River Stour Lower (IoH Stratford to Flatford)4 siteslatest 3 Jul 2024
  47. Rockland Broad4 siteslatest 21 Aug 1991
  48. Salhouse Broad4 siteslatest 26 Sept 1999
  49. Steeping FMU4 siteslatest 9 Jun 2005
  50. Stiffkey4 siteslatest 1 May 2026
  51. Testwood & Nursling Fishery4 siteslatest 13 Aug 2025
  52. Trader/Maud Foster Drain4 siteslatest 29 Jun 2009
  53. U/S Boston4 siteslatest 25 Jul 2005
  54. Wroxham Broad4 siteslatest 11 Aug 2005
  55. Asheldham Brook3 siteslatest 24 Apr 2003
  56. Babingley3 siteslatest 7 May 1996
  57. Blakeney Brook (Blackpool Brook)3 siteslatest 28 Jul 2021
  58. C&B Navigation (Long Pond)3 siteslatest 19 Oct 2004
  59. Chestle Pill Rhine3 siteslatest 9 Oct 2013
  60. Eel Survey3 siteslatest 16 Jul 2013
  61. Ely Ouse3 siteslatest 22 Sept 2006
  62. Great Stour - main river3 siteslatest 29 Sept 2009
  63. Heacham3 siteslatest 19 May 2008
  64. Old West River3 siteslatest 30 Sept 2003
  65. Ravensbourne3 siteslatest 8 Apr 2008
  66. River Alde (Main Reaches)3 siteslatest 14 Jul 2010
  67. River Cam3 siteslatest 14 May 2002
  68. River Don3 siteslatest 4 Aug 2025
  69. River Frome (West Midlands)3 siteslatest 16 Aug 2024
  70. River Swilgate3 siteslatest 7 Sept 2021
  71. River Went3 siteslatest 11 Jul 2017
  72. South Dike FMU3 siteslatest 5 Jun 1995
  73. U/S Tattershall Bridge3 siteslatest 15 Jul 2003
  74. Waithe Beck FMU3 siteslatest 16 May 2018
  75. Aldingbourne Rife2 siteslatest 30 Apr 2014
  76. Arram Beck2 siteslatest 26 Sept 2016
  77. Arun (Solent and South Downs)2 siteslatest 16 Jul 2019
  78. Beeleigh Weir Elver Traps2 siteslatest 8 Jul 2023
  79. Belstead Brook 2 siteslatest 20 May 2004
  80. Beverley Brook2 siteslatest 18 Jun 2012

Distribution

By ecology region

  • East Anglia235 sites
  • Lincolnshire and Northamptonshire84 sites
  • Wessex53 sites
  • Cumbria and Lancashire51 sites
  • Yorkshire44 sites
  • West Midlands42 sites
  • Devon and Cornwall and the Isles of Scilly36 sites
  • Solent and South Downs35 sites
  • North East16 sites
  • Kent, South London and East Sussex15 sites
  • East Midlands13 sites
  • Greater Manchester Merseyside and Cheshire12 sites
  • Hertfordshire and North London7 sites
  • Thames2 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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