General Information

Event name: US-06-002
Nature of the harmful event:
High Phyto concentration , Mass mortalities
Event directly affected:
Shellfish , Aquatic Mammals
Toxicity detected: Yes (Approximate range: 1-169 ug/g tissue)
Associated syndrome: ASP
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (CA Department of Health Services Marine Biotoxin Monitoring Program)
Event occurred before in this location: Yes (Early spring/early summer event in central/southern CA typical over the past several 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. Santa Barbara, Ventura, LA, and Orange Counties (19): South of Pt Conception
Bloom event dates (yyyy/mm/dd): Start: 2006-03-01, End: 2006-04-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: 1. March: Elevated DA levels in mussels from SB (22 ppm), lobster viscera from Channel Islands (70 ppm), and sardines (viscera) from LA/Orange region. Low DA levels persisted at a number of sites through April, with mussels from an oil platform off of LA/Orange exceeding the alert level (20 ppm). Santa Barbara and Ventura counties, offshore near Channel Islands: alert levels of DA in lobster viscera in December (169 ppm).


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: Samples from volunteer monitoring network caught dramatic increase in Pseudo-nitzchia from Feb to March along the Southern California coast. Numbers declined but this diatom remained a common member of the phytoplankton
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 23 ppm LC
Kit used: Yes Type of kit used: Jellet rapid extraction kit us
Additional information: HPLC
Economic losses:
Management decision: Harvest closures in commercial aquaculture areas; Health Advisory for sportharvested shellfish and viscera of sardine, anchovy, crab and lobster in Southern California.
Additional harmful effect information:
Updated at 01:18 on 10 Oct 2020