General Information

Event name: US-19-026
Nature of the harmful event:
Seafood toxins , Mass mortalities
Event directly affected:
Shellfish , Aquatic Mammals
Toxicity detected: Yes (Approximate range: Razor clams (Siliqua patula) year max 450 ppm; California mussel (Mytilus californianus) 23-31ppm (alert level 20ppm))
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Razor clams (Siliqua patula), California mussel (Mytilus californianus)
Report the outcome of a monitoring programme: Yes (California Department of Public Health Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes
Individuals to contact: ZUBKOUSKY-WHITE, Vanessa , NORRIS, Tenaya

Location & Date

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Location: Latitude: , Longitude:
General location information: Northern California, Mendocino, Del Norte, and Humboldt counties
HAB Area code(s): US-21
Additional location information: 3/18-10/14 Razor clams (Del Norte & Humboldt), 10/1-10/31 CA mussels (Mendocino & Humboldt)
Bloom event dates (yyyy/mm/dd): Start: 2019-03-18, End: 2019-10-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 09:11 on 8 Apr 2020
Updated at 09:16 on 8 Apr 2020