General Information

Event name: US-92-016
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 96 g STXeq / 100 g. tissue.)
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, 1954, 1962, 1963, 1964, 1965, 1966, 1970, 1971, 1976, 1980, 1981, 1982, 1984, 1986, 1987, 1988, 1989, 1990, 1991.)
Individuals to contact: ROSS, Maria R.

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: Marin County., California.
HAB Area code(s): US-21
Additional location information: California areas and shellfish affected Chimney Rock LBS Drakes Bay (sentinel sea mussel), Stinson Beach south rocks (wild sea mussel)
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: April, June: PSP above alert contentration. March, May and September: toxin high measurable below alert levels.


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 report of a bloom condition during these time periods.
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: Sentinel sea mussel content assayed 96 g/100 g tissue; wild sea mussel concentration recorded at 96 g/100 g of mussel tissue. In March the cultured bay mussel PSP concentration was 53 g and in September PSP level in cultured Pacific oysters rose to 58 g.
Economic losses:
Management decision: The Annual quarantine on sport harvested mussels went into effect on May 1, 1992 and continued through October 31, 1992.
Additional harmful effect information: .