MENDOCINO Co., 10/15/19 — The California Department of Public Health (CDPH) has issued a warning against eating "sports-harvested mussels, clams, or whole scallops" from Mendocino and Humboldt counties, due to findings of domoic acid, which can lead to illness or death. The warning lasts until October 31, and does not apply to commercially harvested mussels, clams, scallops and oysters "from approved sources."
The symptoms of domoic acid poisoning can kick in between 30 minutes to 24 hours after consuming the toxin, and include "vomiting, diarrhea, abdominal cramps, headache and dizziness," however more serious cases can lead to trouble breathing, seizures, memory loss, comas, and death. More details are included below.
Testing will continue and the CDPH will update the warnings to the public if domoic acid decrease. You can find out the most current information by calling CDPH’s toll-free Shellfish Information Line at (800) 553-4133 or by going to the CDPH Marine Biotoxin Monitoring Web page.
Here's the full announcement from CDPH:
Shellfish Safety Notification: Sport-Harvested Bivalve Shellfish from Humboldt and Mendocino Counties
Dangerous levels of domoic acid have been detected in mussels from Humboldt and Mendocino Counties. The naturally occurring toxin is also referred to as Amnesic Shellfish Poisoning (ASP) and can cause illness or death in humans. Cooking does not destroy the toxin.
The California Department of Public Health (CDPH) is advising consumers not to eat sports-harvested mussels, clams, or whole scallops from those counties.
This shellfish safety notification is in addition to the annual mussel quarantine. The annual quarantine applies to all species of mussels harvested along the California coast, as well as all bays and estuaries, and will continue through at least October 31. The warning against eating sport-harvested razor clams in Del Norte and Humboldt counties also remains in effect, due to continued elevated levels of domoic acid.
This warning does not apply to commercially sold clams, mussels, scallops or oysters from approved sources. State law permits only state-certified commercial shellfish harvesters or dealers to sell these products. Shellfish sold by certified harvesters and dealers are subject to frequent mandatory testing to monitor for toxins.
Symptoms of ASP can occur within 30 minutes to 24 hours after eating toxic seafood. In mild cases, symptoms may include vomiting, diarrhea, abdominal cramps, headache and dizziness. These symptoms disappear within several days. In severe cases, the victim may experience trouble breathing, confusion, disorientation, cardiovascular instability, seizures, excessive bronchial secretions, permanent loss of short-term memory, coma or death. No cases of human ASP from domoic acid are known to have occurred in California.CDPH press release, October 15, 2019.
You can get the most current information on shellfish advisories and quarantines by calling CDPH’s toll-free Shellfish Information Line at (800) 553-4133. For additional information, please visit the CDPH Marine Biotoxin Monitoring Web page.