December 18, 2025 — Delays in California’s Dungeness crab season are continuing to impact Humboldt County and other parts of Northern California as state wildlife officials conduct safety testing for domoic acid, a naturally occurring toxin that can accumulate in shellfish.
While much of Humboldt County remains closed to crabbing, the ripple effects of the delay are already being felt across the state. With local crab limited or unavailable in several regions, seafood markets are turning to out-of-state supply, driving prices higher during what is typically one of the busiest times of year.
The delays stem from elevated levels of domoic acid detected during preseason testing conducted by the California Department of Fish and Wildlife. Domoic acid is a neurotoxin produced by certain types of marine algae and can build up in shellfish under specific ocean conditions.
“Domoic acid is produced by a naturally occurring single-celled marine alga,” said Christy Juhasz, a senior environmental scientist specialist with the California Department of Fish and Wildlife’s Marine Region. “Under certain ocean conditions, that alga can proliferate and release this toxin into the water.”