General Information

Event name: US-20-019
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Natural Fish
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: Long Island, New York
HAB Area code(s): US-08
Additional location information: Great South Bay, Narrow Bay, Moriches Bay, Quantuck Bay, Shinnecock Bay, Moneybogue Bay
Bloom event dates (yyyy/mm/dd): Start: 2020-05-21, End: 2020-10-09
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (41,773,000 cells/L)
Co-Ocurring Species/Genus: Synechococcus spp. (>3,000,000,000 cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information: The year 2020 marks the third consecutive year in 13 years that maximum concentrations of Aureococcus anophagefferens did not exceed 1.5 billion cells/L in the affected 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: 27.3 °C, Min: 15.8 °C
Salinity Range During Event: Max: 31.3, Min: 26.3
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 08:04 on 23 Apr 2021