General Information

Event name: US-90-010
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 summer blooms, at least since 1985.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Barnegat Bay., New Jersey.
HAB Area code(s): US-09
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1990-06-15, End: 1990-09-15
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Mid June to mid September


Causative organism known: Yes
Causative Species/Genus: Nannochloris atomus (>1,000,000 cells/L)
Bloom peaks in late July and Late August
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: From 15.71 to 24.26 g/L Chl between June 12 µg/l
Additional bloom information:
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: Other measurements may be available from the NJ DEP 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 as part of NJ DEP/US EPA coastal monitoring program; eutrophication study by NJ DEP Division of Science and Research still underway.
Additional harmful effect information: Summer-long bloom, yellowish-brown water discoloration; mats of dead eelgrass on shores coincident.