General Information

Event name: US-17-019
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Domoic acid @ 32 ug/g max in shellfish)
Associated syndrome: ASP
Unexplained toxicity:
Species implicated in toxin transmission (transvector): Shellfish harvest closure in southern Narragansett Bay, RI, USA due to a Pseudo-nitzschia spp, bloom and domoic acid detection in shellfish (Northern Quahogs (Nercenaria mercenaria). Closure duration was 3/1/2017 to 3/24/2017, max domoic acid was 32ug/g
Report the outcome of a monitoring programme: Yes (RI DEM and DOH HAB phytoplankton monitoring program)
Event occurred before in this location: Yes (ASP closure in this area during October 2016.)
Individuals to contact: BORKMAN, David

Location & Date

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Location: Latitude: 41.532778, Longitude: -71.415278
General location information: Lower Narragansett Bay, RI, Rhode Island
HAB Area code(s): US-07
Additional location information: Shellfish closure of lower Narragansett Bay, RI includes West Passage south of Jamestown Bridge, East Passage south of Newport Bridge and southern half of Sakonnet River. Estuarine ecosytem. Pseudo-nitzschia spp. bloom in October 2016 was followed by
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2017-03-01, End: 2017-03-24
Additional date-related information: decreased abundance during Nov, Dec, Jan.


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. (200000 cells/L)
Class bacillariophyceae
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: ~10-20 ug/L µg/l
Additional bloom information: Information at:
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:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 09:37 on 23 Apr 2018