Strains of the P. cf. granii from Ocean Station Papa (50°N, 145°W) have been confirmed to produce domoic acid at the level 0.0004 fg/cell
Trick, C. G.; Bill, B. D.; Cochlan, W. P.; Wells, M. L.; Trainer, V. L.; Pickelld, L. D. (2010). Iron enrichment stimulates toxic diatom production in high-nitrate, low-chlorophyll areas. <em>Proc Natl Acad Sci U S A.</em> 107(13), 5887-5892.