General Information

Event name: US-89-013
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 1,800 g STXeq / 100 g meat.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (1962, 1963, 1964, 1965, 1980, 1982, 1984, 1986, 1988, and early 1989.)
Individuals to contact: ROSS, Maria R.

Location & Date

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Location: Latitude: , Longitude:
General location information: Marin County, California
HAB Area code(s): US-21
Additional location information: Areas affected fot the second time: Drakes Bay Chimney Rock, Drakes Estero Area (#7, #8, #12, #20, #38), Limantour Beach, Tomales Bay (Tomales Point, Lawson's Landing, lease M430-11), Rodeo Beach (high and low rock)
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: August, September, early October, December


Causative organism known: Yes
Causative Species/Genus: Protogonyaulax catenella ( 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: 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:
Growth Comments Both advected and in situ growth appeared to have contributed to bloom conditions.
Additional Environmental information: No data available

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Japanese scallop Saxitoxins 1,800 Bioassay-Mouse
Cultured Pacific oyster Saxitoxins 360 Bioassay-Mouse
Cultured bay mussel Saxitoxins 1,500 Bioassay-Mouse
Wild bay mussel Saxitoxins 900 Bioassay-Mouse
sentinel sea mussel Saxitoxins 1,800 Bioassay-Mouse
Wild sea musse Saxitoxins 210 Bioassay-Mouse
Unidentified mussel Saxitoxins 460 Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses:
Management decision: Department of Health Services issued an immediate public PSP alert via the news media warnign aboutthe developing bloom. Since the annual mussel quarantine was still in effect the importance of complying with it was stressed.
Additional harmful effect information: