General Information

Event name: US-19-027
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 41 ug STX eq/100g)
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (CT Department of Agriculture Bureau of Aquaculture)
Event occurred before in this location: Yes (Rarely)
Individuals to contact: VAN GULICK, Emily

Location & Date

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Location: Latitude: , Longitude:
General location information: Palmer Cove, Connecticut Coast
HAB Area code(s): US-07
Additional location information: 41.32131, -72.00263
Bloom event dates (yyyy/mm/dd): Event Date:2019-06-13
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Follow up MBAs on 6/19 and 6/25 were negative


Causative organism known: Yes
Causative Species/Genus: Alexandrium spp. (92 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: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): 21.1 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 27.2 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 21.1 °C, Min: 16.6 °C
Salinity Range During Event: Max: 29.3, Min: 27.2
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information: Alexandrium pseudogonyaulax "bloom" >1,000 cells/L in the Poquonnock River, Groton, CT associated with heavy rainfall, and is likely also associated with coastal Alexandrium blooms. >1 inch of rain fell 6/10-11, just prior to the positive MBA.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Blue mussel Saxitoxins 41 ug/100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information: The STX concentration detected was just above the lab's detection limit (~33-39 ug STX eq/100g shellfish).
Economic losses: The recreational area outside of Palmer Cove was precautionarily closed for a short period of time, but there was no major economic loss. No commercial areas had to be closed.
Management decision: Immediate precautionary closure of recreational area outside of Palmer Cove and follow up testing in recreational and commercial areas nearby. There were no positive results in surrounding areas, and the MBA in Palmer Cove the next week was negative.
Additional harmful effect information:
Created at 09:35 on 8 Apr 2020
Updated at 10:11 on 8 Apr 2020