General Information

Event name: US-05-001
Nature of the harmful event:
High Phyto concentration , Seafood toxins , Mass mortalities
Event directly affected:
Shellfish , Aquatic Mammals
Toxicity detected: Yes (Approximate range: 31 - 290 ug/g tissue)
Associated syndrome: ASP
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (California Department of Health Services Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes (Late spring/early summer event in central/southern California typical over the past four years)
Individuals to contact: LANGLOIS, Gregg

Location & Date

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Location: Latitude: , Longitude:
General location information: California, South Coast, Central Coast, Northern Coast
HAB Area code(s): US-19 US-20 US-21
Additional location information: 1. Offshore of Santa Barbara County (19) and Ventura County.: South of Pt. Conception 2. Humboldt County (21): Northern California. 3. Del Norte County, Northern California, borders Oregon.
Bloom event dates (yyyy/mm/dd): Start: 2005-03-01, End: 2005-07-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 1. Santa Barbara: DA levels low to moderate (2-15 ppm) throughout June at site .75 miles offshore.exceed alert level by late April through early May: 87 ppm in mussels and 26 ppm in pacific oysters. Santa Barbara and Ventura counties, offshore near Channel Islands: alert levels of DA in lobster viscera in October (290 ppm) 2. Del Norte County: DA concentration above alert level detected by mid October: 42 ppm in mussels.


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: 1. Santa Barbara/Ventura counties: Evidence of persistent offshore bloom of Pseudo-nitzschia in samples from volunteer network. Low cell numbers at near shore sites. DA toxin levels mirrored this pattern.
Event-related bibliography: Monthly/Annual reports issued by CDHS Marine Biotoxin Monitoring Program.

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
Mytilus californianus Domoic Acid 45 ppm LC
M. galloprovincialis Domoic Acid 87 ppm LC
Crassostrea gigas Domoic Acid 26 ppm LC
Siliqua patula Domoic Acid 170 ppm LC
Kit used: Yes Type of kit used: Jellet rapid extraction kit us
Additional information:
Economic losses:
Management decision: Harvest closures in commercial aquaculture areas; Health Advisory for sportharvesting of shellfish in Northern California.
Additional harmful effect information: HPLC
Updated at 01:18 on 10 Oct 2020