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Table 5 CEFAS water sample results for four toxic marine microalgae species from 1999-2009 in Wales and England

From: Toxic marine microalgae and shellfish poisoning in the British isles: history, review of epidemiology, and future implications

   Dinophysis spp. Prorocentrum spp. Alexandrium spp Pseudo-nitzschia  
  No. water samples tested % Present %> limit % Present %> limit % Present % Present %> limit Reference
April 1999 - March 2000 320 NA 1 (0.3%) NA NA 4 (1.3%) NA 0 [49]
April 2000 - March 2001 350 25 (7.1%) 2 (0.6%) NA NA NA 15 (4.3%) 0 [56]
April 2001 - March 2002 195 NA 0 NA NA NA 14 (7.2%) 0 [57]
April 2002 - March 2003 1529 23 (1.5%) 1 (0.1%) NA NA NA 50 (3.3%) 0 [58]
April 2003 - March 2004 388 0 0 NA NA 13 ( 3.4%) 18 (4.6%) 0 [59]
April 2004 - March 2005 314 6 (1.9%) 1 (0.3%) 6 (1.9%) 1 (1.9%) 6 (1.9%) 28 (8.9%) 0 [50]
April 2005 - March 2006 737 23 (3.1%) 7 (0.9%) 3 (0.4%) 1 (0.1%) 80 (10.9%) 277 (37.6%) 3 (0.4%) [60]
April 2006 - March 2007 879 83 (9.4%) 31 (3.5%) 10 (1.1%) 5 (0.6%) 150 (17.1%) 374 (42.5%) 32 (3.6%) [61]
April 2007 - March 2008 1122 18 (1.6%) 4 (0.4%) 3 (0.3%) 0 139 (12.4%) 570 (50.8%) 4 (0.4%) [62]
April 2008 - March 2009 1079 25 (2.3%) 4 (0.4%) 11 (1.0%) 5 (0.5%) 75 (6.9%) 438 (40.6%) 21 (1.9%) [51]
  1. The number of water samples tested, with the species % present in each sample, and the % of samples exceeding the action limit have been recorded. (NA = no results during that time period).