The California Department of Public Health(opens in new tab) (CDPH) coordinates a routine monitoring program along the California coast to sample mussels and other shellfish like clams and scallops for the presence of Paralytic Shellfish Poisoning (PSP) and domoic acid toxins. Commercial shellfish harvesters are also required to provide weekly shellfish samples to CDPH for PSP toxin assay and domoic acid analysis. If toxin levels are high enough, warnings and quarantines are issued to protect the recreational fishing public and shellfish consumers.
CDPH also has a coastwide, monthly seawater monitoring program(opens in new tab) which detects the naturally occurring, microscopic algae that produce PSP and domoic acid toxins. When toxin levels begin increasing, CDPH may expand its mussel sampling effort to include other seafood species. If toxin levels increase quickly beyond the federal alert level for either toxin, then CDPH may immediately issue a health advisory for all potentially impacted seafood species in the affected region.
This page was established as a source of information for fishermen and the fishing industry. When circumstances arise, CDPH(opens in new tab) warnings, quarantine information, and health advisories about consuming California's ocean finfish, shellfish and crustaceans will be posted here.
The Office of Environmental Health Hazard Assessment(opens in new tab) (OEHHA) also issues consumption advisories(opens in new tab) based on the amount of mercury or other chemical toxins found in finfish, shellfish and crustaceans. Safe eating guidelines(opens in new tab) to help you to reduce your exposure to chemicals in sport fish—fish that you and your family or friends catch—are also available from OEHHA.
News Releases
Razor Clam Fishery
CDFW has closed the recreational razor clam fishery in Del Norte County as of November 9, 2023, and in Humboldt County as of May 2, 2024.
Spiny Lobster Fisheries: Open and Closed Ocean Waters
Dungeness and Rock Crab Fisheries: Open and Closed Ocean Waters
Recreational Fisheries for Dungeness Crab and Rock Crab
- For recreational Dungeness crab fishing season dates and regulations that apply in open areas, review ocean sport fishing regulations.
- For recreational rock crab fishing regulation information please see the ocean sport fishing regulations. NOTE: The CDPH and OEHHA strongly recommend that consumers avoid eating rock crab viscera (internal organs, also known as “butter” or “guts”) because the viscera usually contain much higher levels of domoic acid(opens in new tab) than crab body meat.
- For the latest information on season delays, closures or trap use restrictions due to marine mammal or sea turtle entanglement risks, visit the CDFW Whale Safe Fisheries page.
- Check this page frequently, or call the Domoic Acid Fishery Closure Information Line at (831) 649-2883, for the most up-to-date information.
- CDPH shellfish consumption advisories are listed here and on the CDPH website(opens in new tab).
Commercial Fisheries for Dungeness Crab and Rock Crab
- The commercial rock crab season is open from the California/Oregon border to the north jetty at the Humboldt Bay entrance (40° 46.15’ N. Lat.) as of April 24, 2025. The November 8, 2016 closure from Cape Mendocino, Humboldt County (40° 30.00’ N. Lat.) to the Mendocino/Humboldt County line (40° 00.00’ N. Lat.) remains in effect. South of the Mendocino/Humboldt county line, the commercial rock crab fishery is open. The closure in Humboldt County will continue until state health agencies determine that domoic acid levels no longer pose a significant risk to public health in that area and recommend the fishery be opened, and the CDFW director provides notification of fishery reopening to commercial fishermen.
- For commercial Dungeness crab season dates, see the commercial fishing regulations.
- For the latest information on season delays or closures caused by entanglement risks, visit the CDFW Whale Safe Fisheries page.
- Check this page frequently or call the Domoic Acid Fishery Closure Information Line at (831) 649-2883 for the most up-to-date information.
Additional Information