General Information

Event name: US-01-004
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
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
Individuals to contact: LANGLOIS, Gregg

Location & Date

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Location: Latitude: , Longitude:
General location information: Marin County., California: Northern, Central.
HAB Area code(s): US-21
Additional location information: Highest relative abundances and cell masses observed inside Drakes Estero and Tomales Bay (Marin Co.) and at several southern California sites.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Detection date: Ceratium spp. (primarily C. furca) became abundant in October im Marin, September at southern California sites where it replaced Gonyaulax polyedra. Bloom continued through October and into November at some sites.


Causative organism known: Yes
Causative Species/Genus: Ceratium furca ( cells/L)
Ceratium spp. ( cells/L)
Ceratium spp. (mostly C. furca). Qualitative assessment showed this species was abundant.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Documented in our program's monthly/quarterly reports.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No 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: Whole column
Growth: Advected
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: