General Information

Event name: US-89-005
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 (Presence of N. atomus first recorded in mid 1960's; intense bloom first noted in 1985; A. anophagefferens detected in 1988.)
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):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Mid June - early October.


Causative organism known: Yes
Causative Species/Genus: Nannochloris atomus (>1,000,000 cells/L)
Dominant species.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 20 to >30 g/L Chl. µg/l
Additional bloom information: (coccoid picoplankton) we did not analyze for Aureococcus this year, but it was detected in low numbers last year (<7.5%)
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 in situ population of N. atomus
Additional Environmental information: Water turbid; (salinity, temp., dissolved oxygen may be available from NJDEP, DSR)

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 routine surveillance (NJ DEP/USEPA); A eutrophication study by NJDEP Div. of Science and Research (DSR) is underway.
Additional harmful effect information: Brownish water discoloration; large mats of dead eelgrass on shores coincident with brown water; sport fish catches probably affected.