Toxic or Harmful Microalgal Species

Paralytic Shellfish Poisoning (PSP) - Causative Organisms:

Alexandrium spp.

 
Alexandrium tamarense
(Photo credit - Larry Fritz)
  Alexandrium tamarense - cyst form
(Photo credit - Y. Fukuyo)
   
  Immunofluorescently-labeled Alexandrium
cell sp. (most likely fundyense)

(Photo credit - Kristin Gribble/WHOI)