General Information

Event name: US-89-007
Nature of the harmful event:
Water Discoloration
Event directly affected:
Toxicity detected: Yes
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 (One of our most frequent dinoflagellates.)
Individuals to contact: FREUDENTAL, Anita

Location & Date

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Location: Latitude: , Longitude:
General location information: Nassau County, Long Island., New York.
HAB Area code(s): US-08
Additional location information: Near shore L.I. Sound and within the North Shore harbors, especially Hempstead Harbour.
Bloom event dates (yyyy/mm/dd): Event Date:1989-08-01
Start: 1989-08-01,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Initially observed on August 1, 1989, with distinct brown water discoloration.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (700,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Estuarine Immediately succeeding 'crashing' diatom bloom of Eucampia zoodiacus and Chaetoceros socialis
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:
Growth Comments Most of highest counts came in with the incoming tidal waters; lowest counts usually occurred at low tide.
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: Increased surveillance and sampling Toxicity testing with new Japanese 'UBE' test - check for DSP by ELISA.
Additional harmful effect information: One possible illness episode later in fall (2 persons with DSP like symptoms) from local clams; awaiting results from new joint NOAA (Natioal Marine Fish)/Mass. State Health Project. UBE test results indicate 2 stations greater than .05 and several posit
Updated at 02:51 on 6 Feb 2020