The molecule appears to be detoxified fairly rapidly in the body.
Symptoms are neurological if it is present above the threshold level for activity.
It is likely to be a close relative of gymnodimine. The activity shows up as a positive in our regulatory tests, so areas affected by this toxin at above the threshold level would closed for shellfish harvesting. It is my understanding that Gymnodinium mikimotoi strains from other parts of the world are not thought to cause shellfish toxicity. I'd be interested in hearing from anyone who has experience of G. mikimotoi blooms and shellfish toxicity. The more input into toxic blooms the better.