General Information

Event name: US-05-018
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector): Possible toxicity noted for soft clam (Mya arenaria) and oyster (Crassostrea virginica) but not confirmed
Report the outcome of a monitoring programme: Yes (Suffolk County Department of Health Services Marine Monitoring Program, Peconic Estuary Program)
Event occurred before in this location: Yes (First noted in West Neck Bay in 2002, then in Flanders and Great Peconic Bays in 2004, advecting into Shinnecock Bay through a one-way flow canal)
Individuals to contact: NUZZI, Robert

Location & Date

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Location: Latitude: , Longitude:
General location information: Peconic Estuary, Northeast
HAB Area code(s): US-08
Additional location information: Possible initiation in western tributaries, with patchy spread throughout the estuary to approximately Shelter Island - about twenty miles. Possible secondary initiation in eastern tributaries.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Late August - mid September


Causative organism known: Yes
Causative Species/Genus: Cochlodinium polykrikoides (19,500,000 cells/L)
in middle of bloom patch
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Nuzzi, R., 2004. Cochlodinium polykrikoides in the Peconic Estuary. Harmful Algae News, 27:10-11.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: 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:
In situ
Growth Comments Possibly occurred first in tributaries, advancing into main bays
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:
Additional harmful effect information: