General Information

Event name: US-91-002
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
Event occurred before in this location: Yes (The bloom was present throughout the entire Peconic Bay system from 1985 through 1987, with cell density occasionally exceeding 1,000,000 cells/ml. Cell numbers declined through 1988 and 1989 and were generally undetectable during 1990 except for West Neck Bay.)
Individuals to contact: NUZZI, Robert

Location & Date

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Location: Latitude: , Longitude:
General location information: Peconic Bay system., New York.
HAB Area code(s): US-08
Additional location information: From Flanders Bay to Gardiners Bay. Highest densities in Flanders Bay (westernmost area) and West Neck Bay (Shelter Island).
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: May through September with peak concentrations (2,000,000 cells/ml) in mid June.


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (2,000,000, cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): <1.0 Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 29 °C, Min: 11 °C
Salinity Range During Event: Max: 30, Min: 20
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: No Type of kit used:
Additional information:
Economic losses:
Management decision: Continue weekly monitoring.
Additional harmful effect information: Water column discoloration (brown) and reduced transparency. Secchi depth < 1.0 m during peak bloom period.