General Information

Event name: US-19-003
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: Yes (Approximate range: .04 - .12 OA eq)
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (DMF Phytoplankton Monitoring Program)
Event occurred before in this location: Yes (Closure in 2015)
Individuals to contact: O'NEIL, Terry

Location & Date

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Location: Latitude: , Longitude:
General location information: Nauset Estuary, Orleans and Eastham, MA,
HAB Area code(s): US-06
Additional location information: 1540 acre estuary on Cape Cod
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2019-07-10, End: 2019-07-19
Additional date-related information: No shellfish tested above 16 g/100g


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata ( 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: °C, Min: °C
Salinity Range During Event:
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 Okadaic Acid .12 OA eq ELISA
Kit used: Type of kit used:
Additional information: Assay run by Jonathan Deeds at the FDA lab in College Park, MD
Economic losses: Recreational Shellfishing area closed for 9 days.
Management decision: Area OC:6 Salt Pond closed to all shellfishing from 7/10/19 through 7/19/19
Additional harmful effect information:
Created at 03:50 on 10 Feb 2020