General Information

Event name: US-94-006
Nature of the harmful event:
Water Discoloration
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 (1993: <1,000 to 250,000 cells/ml (January-March, August-November); 1992: 1,000 to 1,000,000 cells/ml (January-December); 1991: < 10,000 cells/ml (Janurary-June); 1990: <10,000 cells/ml (May-December); 1989: <24,000 cells/ml (April-September); 1988: 1,000 to 500,000 cells/ml (June-August); 1985, 1986: > 1,000,000 cells/ml.)
Individuals to contact: NUZZI, Robert

Location & Date

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Location: Latitude: , Longitude:
General location information: Great South Bay., New York.
HAB Area code(s): US-08
Additional location information: The bloom was present in the central portion of the bay, from the Robert Moses Causeway bridge to the waters off Sayville.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: June-July, with peack concentrations approaching 1,000,000 cells/ml occurring in late June. A secondary bloom began in mid-August and was still present in late October, when densities up to 12,000 cells/ml were found.


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (1,000,000, cells/L)
Late June
Aureococcus anophagefferens (12,000,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): >0.5 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: 28 °C, Min: 18 °C
Salinity Range During Event: Max: 29, Min: 24
Bloom location in the water column:
In situ
Growth Comments Probably.
Additional Environmental information: Dissolved oxygen: 5.8 - 11.3 mg/l.

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: Increase the frequency of monitoring activities.
Additional harmful effect information: Effects: Primarily aesthetic - water column discoloration (brownish) and reduced transparency. Effects on various shellfish species have previously been reported.