General Information

Event name: US-00-012
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Planktonic life , Shellfish
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Suffolk County Department of Health Services, Office of Ecology, South Shore Estuary.)
Event occurred before in this location: Yes (Bloom began in Fall-winter 1999 and continued into 2000, and sporadically since 1985.)
Individuals to contact: NUZZI, Robert

Location & Date

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Location: Latitude: , Longitude:
General location information: South Shore Estuary (Great South, Moriches an, New York, NE Coastal.
HAB Area code(s): US-08
Additional location information: Lagoonal system about 85 kilometers long, with limited fllushing and ocean exchange. Highest cell numbers in Great South Bay.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom began in Fall-Winter 1999 extending into 2000.


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (1,170,000, cells/L)
Value provided for this area for 1999 is incorrect. Should be 732,000,000
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Aureococcus blooms ("brown tide") have occurred sporadically in this region since 1985. Evidence suggests bloom may be related to relative availability of dissolved organic nitrogen/dissolved inorganic nitrogen. The 1999 bloom was preceded by the die-off
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): 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: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
In situ
Growth Comments
Additional Environmental information: Cell numbers declined during winter freeze, and increased to peak cell numbers in June. Numbers decline as water temperature exceeds about 25 degrees C.

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: Effect on shellfish harvest and future year classes.
Management decision: Continue monitoring. Support research on Aureococcus physiology and brown tide dynamics.
Additional harmful effect information: