State health agencies determined last spring that razor clams in Humboldt and Del Norte counties had unhealthy levels of domoic acid and recommended fishery closure in April 2016. The California Fish and Game Commission closed the fishery under emergency rules from April to October 2016 and extended the closure to Jan. 26, 2017.
Domoic acid is a potent neurotoxin produced by a naturally occurring marine algae. It causes illness and sometimes death in a variety of birds and marine mammals that consume affected organisms. At low levels, domoic acid exposure can cause nausea, diarrhea and dizziness in humans. At higher levels, it can cause persistent short-term memory loss, seizures and can in some cases be fatal.