General Information

Event name: US-90-006
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 (The bloom was present throughout the entire Peconic Bay system during 1985 and 1986, with cell numbers exceeding 10(6) cells/ml. West Neck Bay, however, was not sampled until 1987, when counts ranged form 1 x 10(5) to 8 x 10(5) cells/ml. Cell numbers declined through 1988 (ranging from undetectable to 2 x 10(5) cells/ml) and 1989 (less than 3 x 10 cells/ml), before increasing in density durgin 1990.)
Individuals to contact: NUZZI, Robert

Location & Date

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Location: Latitude: , Longitude:
General location information: West Neck Bay, Shelter Island, New York.
HAB Area code(s): US-08
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: April - July (>5.6 x 10(5) cells/ml on 7/10/90) September - October (>1.8 x 10(4) cells/ml on 10/10/90)


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (560,000,00 cells/L)
Aureococcus anophagefferens (<18,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): < 1 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: 27 °C, Min: 11 °C
Salinity Range During Event: Max: 28, Min: 25
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information: Dissolved Oxygen: 6.1 - 8.8 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: Continue weekly monitoring program
Additional harmful effect information: Primarily aesthetic - water discoloration (brown) and reduced transparency - secchi readings of less than 1 meter were recorded during peak concentrations. Effects on various shellfish species have previously been reported for other embayments.