General Information

Event name: US-17-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Long Island Marine Monitoring Network)
Event occurred before in this location: Yes
Individuals to contact: Young, Craig

Location & Date

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Location: Latitude: , Longitude:
General location information: Great South Bay, South Oyster Bay, Quantuck Bay, Moriches Bay, Shinnecock Bay, Moneybogue Bay, Hewlett Bay, 8
HAB Area code(s): US-08
Additional location information: The area affected covers over 100km of shoreline within multiple estuaries
Bloom event dates (yyyy/mm/dd): Event Date:2017-05-03
Start: 2017-05-03, End: 2017-10-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Ended Aug 7th, reappeared Oct 5th until 10/31


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (1942685000 cells/L)
Class pelagophyceae
Co-Ocurring Species/Genus: Synechococcus sp. (>3000000000 cells/L)
Class Cyanophyceae
Chlorophyll concentration, if known: 28.3 µg/l
Additional bloom information: The year 2017 marks the 8th consecutive year that max concentrations of Aureococcus anophageffrens exceeded 1.5 billion cells/L in this region.
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: 29.3 °C, Min: 14.4 °C
Salinity Range During Event: Max: 31.8, Min: 19.5
Bloom location in the water column:
In situ
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 04:06 on 23 Apr 2018