General Information

Event name: US-91-006
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 (Chronic blooms at least since 1985; N. atomus presence first discovered on Barnegat Bay 1965.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Barnegat Bay., New York.
HAB Area code(s): US-09
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Early June to early September. Peak in early July.


Causative organism known: Yes
Causative Species/Genus: Nannochloris atomus (1,000,000, cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: > 22 g/L Chl. µg/l
Additional bloom information: Blooms at times almost monospecific.
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:
In situ
Growth Comments
Additional Environmental information: Data may be available from NJOEP Division of Science and Research.

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: Ongoing surveillance (NJDEP/USEPA), entrophication study (NJDEP).
Additional harmful effect information: Yellow brown water discoloration, virtually summer-long.