Harmful Algal Information System: Event US-91-013

General Information

Event name:	US-91-013
Country:	UNITED STATES
Nature of the harmful event:	Seafood toxins
Event directly affected:
Toxicity detected:	Yes (Approximate range: 390 痢 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 (1970, 1971, 1982, 1983, 194, 1986, 1987, 1988, 1989, 1990.)
Individuals to contact:	ROSS, Maria R.

Location & Date

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Location:	Latitude: , Longitude:
General location information:	San Mateo County., California. HAB Area code(s): US-20
Additional location information:	Pescadero State Beach, Linda Mar, Moss Beach, Bean Hollow State Beach (Wild Sea Mussels).
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	January, February, April, May, June, July, October, November.

Microalgae

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:

In situ

Growth Comments

This appears to be an in situ population.

Additional Environmental information:

No data available.

Toxin Assay Information

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Wild sea mussel (June Pescadero)	Saxitoxins	STX eq	173	Bioassay-Mouse
Wild sea mussel (Ben Hollow)	Saxitoxins	STX eq	390	Bioassay-Mouse
Wild sea mussel (Linda Mar)	Saxitoxins	STX eq	110	Bioassay-Mouse

Kit used: No

Type of kit used:

Additional information:

Economic losses:

Management decision:

The California Annual Mussel Quarantine was in effect.

Additional harmful effect information:

In June Pescadero State Beach wild sea mussel samples assayed 173 痢 PSP; July wild sea mussel samples from Ben Hollow State Beach reached 390 痢/100g and at Linda Mar 110 痢, while the Pescadero State Beach samples remained at 100 痢; October samples fro