Chains of Pseudo-nitzschia sp. isolated from the Gulf of Maine. (L. Fernandes)

Antibody probed, immunofluorescent image (left) and bright field image (right) of Pseudo-nitzschia multiseries. (D. Anderson)

Pseudo-nitzschia viewed through a SEM microscope. (S. Bates)

Pseudo-nitzschia australis. (J. Rines)

Sea lion affected by domoic acid. (Photo credit unknown)

A pelican killed by domoic acid. (T. Work)

California sea lion killed by domoic acid poisoning. (Five Cities Gazette)