 Consequently, elevated levels of domoic acid were measured in stranded marine mammals, prompting the closure of beaches and damaging razor clam, rock crab and Dungeness crab fisheries.In 1961, seabirds attacked the Capitola area in California, and though it was never confirmed, they were thought to be under the influence of domoic acid.In 1987, on Prince Edward Island, Canada, there was a shellfish poisoning resulting in 3 deaths.