General Information

Event name: US-16-008
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 3-6ppm)
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector): Quahogs
Report the outcome of a monitoring programme: Yes (RI DEM Shellfish Program)
Event occurred before in this location: No
Individuals to contact: BORKMAN, David

Location & Date

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Location: Latitude: , Longitude:
General location information: Lower Narragansett Bay, RI, RI
HAB Area code(s): US-07
Additional location information: Narragansett Bay closed to shellfish harvest (wild and aquaculture) from 10/7/2016 to 10/15/2016 and 10/20/2016 to 10/29/2016 due to ASP threat.
Bloom event dates (yyyy/mm/dd): Start: 2016-10-07, End: 2016-10-20
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. (2000000 cells/L)
pennate diatom
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: related information at:

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: 18 °C, Min: 9 °C
Salinity Range During Event:
Bloom location in the water column: Whole column
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Quahogs (Mercenaria mercenaria) Domoic Acid 6ppm Other
Kit used: Type of kit used:
Additional information: HPLC and also quick kits Scotia for Domoic Acid
Economic losses:
Management decision: Closure of shellfish harvesting (wild harvest and aquaculture)
Additional harmful effect information:
Created at 10:23 on 27 Feb 2017
Updated at 02:48 on 6 Feb 2020