General Information

Event name: US-92-015
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 200 g in the siphon and 150 g in the viscera. (g STXeq / 100 g.))
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 (1927, 1929, 1930, 1932, 1937, 1954, 1962, 1968, 1969, 1970, 1971, 1976, 1980, 1981, 1982, 1984, 1989, 1990, 1991)
Individuals to contact: ROSS, Maria R.

Location & Date

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Location: Latitude: , Longitude:
General location information: Sonoma County., California.
HAB Area code(s): US-21
Additional location information: California areas and shellfish affected Bodega Harbor, outer (Washington clam).
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: April, July, November.


Causative organism known: Yes
Causative Species/Genus: Alexandrium 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 No bloom conditions were reported.
Additional Environmental information: No data available.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: No Type of kit used:
Additional information: The paralytic shellfish toxin levels in the Washington clam were siphon assayd 120 g/100 g, the viscera 54 g in April; during July PSP levels increased to 200 g in the siphon and 150 g in the viscera; toxin levels in November were 120 g in siphon and 100 g in viscera. No samples had been submitted during the rest of the time.
Economic losses:
Management decision: The California Annual Quarantine was extended to inclurde the Washington clam even beyond the normal Quarantine period.
Additional harmful effect information: