In humans, this type of poisoning is caused by the accumulation of domoic acid. Domoic acid acts as a neurotoxin, crossing into the brain and interfering with nerve signal transmission. Symptoms range from vomiting, nausea, seizures, diarrhea, headaches, dizziness, disorientation, short term memory loss, and permanent brain damage. Species found to contain domoic acid in Australia to date inlcude;
Pseudo-nitzschia multistriata
Pseudo-nitzschia cuspidata
Pseudo-nitzschia australis