General Information

Event name: US-08-005
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Shellfish , Aquatic Mammals
Toxicity detected: Yes (Approximate range: 1 - 12 ppm; single sample at 37 ppm)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (California Dept. of Public Health, Marine Biotoxin Program)
Event occurred before in this location: Yes
Individuals to contact: LANGLOIS, Gregg

Location & Date

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Location: Latitude: 34.008889, Longitude:
General location information: Anacapa Island, Southern California, Channel Islands
HAB Area code(s): US-19 US-21
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2008-12-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: With the exception of this one sample above the alert level, we experienced persistent low levels of domoic acid at various locations along the southern California coast from Jan. through Sept. We had a rare bloom of Pseudo-Nitzschia at our monitoring sites in Marin and Sonoma counties, with low levels of DA detected in sentinel mussels (1-5 ppm). This is the first year since 2000 that we did not experience significant DA concentrations above the alert level.


Causative organism known: No
Causative Species/Genus: Pseudo-nitzschia spp. ( cells/L)
Area 19: March-April peak activity between SB and LA, Area 20: May peak activity, Area 21: August peak activity
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: 0
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
Pacific Oysters (Crassostrea Gigas) Domoic Acid 37 ppm LC
Bivalve Shellfish (Mussels, Bay Mussels) Domoic Acid 37 ppm LC
Low Frequency Crustaceans, Scallops Domoic Acid 37 ppm LC
Kit used: Yes Type of kit used: Jellett: rapid extraction in t
Additional information:
Economic losses:
Management decision: no commercial closure warranted
Additional harmful effect information: