General Information

Event name: US-19-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 0-388 g/100g)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (MA DMF Biotoxin Monitoring Program)
Event occurred before in this location: Yes
Individuals to contact: O'NEIL, Terry

Location & Date

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Location: Latitude: , Longitude:
General location information: North and South Shore of Massachusetts,
HAB Area code(s): US-04
Additional location information: Closure covered all State waters from the NH/MA line southward to Duxbury MA.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2019-06-19, End: 2019-07-19
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium sp. ( 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: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 20 °C, Min: 15 °C
Salinity Range During Event: Max: 34, Min: 25
Bloom location in the water column: Whole column
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue Mussels Saxitoxins 388 g/100g Bioassay-Mouse
Kit used: No Type of kit used:
Additional information:
Economic losses: Commercial and recreational shellfisheries along coastline closed for approximately 30 days.
Management decision: Coastline closed to shellfishing 6/19/19 through 7/19/19.
Additional harmful effect information:
Created at 03:21 on 10 Feb 2020