General Information

Event name: US-01-011
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 260 g STX eq /100 g.)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Massachusetts Division of Marine Fisheries PSP Monitoring Program.)
Event occurred before in this location: Yes (This has become a relatively common annual event in the Nauset System.)
Individuals to contact: WHITTAKER, Dave

Location & Date

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Location: Latitude: , Longitude:
General location information: Nauset Estuary, Cape Cod., Massachusetts.
HAB Area code(s): US-05
Additional location information: The Nauset System encompasses the towns of Orleans and Eastham. Toxicity in Mytilus and Mya found in different areas of estuary.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Date of quarantine levels: 10/04/01 - 21/05/01.


Causative organism known: Yes
Causative Species/Genus: Alexandrium tamarense ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Cloudy. Turbidity (NTU): Wind direction: E
Stratified water: No Oxygen content (nL/L): Wind velocity: 5-10
Temperature (°C): 15.5 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 31 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 15 °C, Min: 7 °C
Salinity Range During Event: Max: 31, Min: 30
Bloom location in the water column:
Growth Comments
Additional Environmental information: Environmental data are from Roberts Cove, Orleans, MA 21/05/01.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus Saxitoxins STX eq 260 Bioassay-Mouse
Mya Saxitoxins STX eq Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses: Economic impact not quantified. However, the area is an active shellfishing area with at least two private shellfish grants. Taking of all shellfish disallowed during entire closure period from 10/4/01 to 29/6/01.
Management decision:
Additional harmful effect information: