General Information

Event name: US-90-027
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 annual blooms.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Sandy Hook Bay., New Jersey.
HAB Area code(s): US-09
Additional location information: Sandy Hook Bay, New Jersey, especially the south shore area; Shrewsbury River, especially in the vicinity of Branchport Creek tributary.
Bloom event dates (yyyy/mm/dd): Event Date:1990-06-29
Start: 1990-06-25, End: 1990-06-30
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Katodinium rotundatum (40,000,000 cells/L)
Dominant species
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: Chlorophyll a in bloom from 25 to 120 g/L on µg/l
Additional bloom information: Surface and bottom samples by Kemmerer from US EPA helicopter.
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: Temperature range 22.5 to 23.2 C (surface), 20,5 to 22.3 C (bottom), slight stratification, salinity 21.9 to 24.0 (surface), dissolved oxygen 3.36 to 9.9 mg/L (surface); 3.79 to 8.55 (botton).

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: Joint surveillance by NJ DEP/US EPA: continuation of the estuarine phytoplankton - dissolved oxygen survey initiated in 1989; New York Bight and coastal monitoring by these agencies ongoing.
Additional harmful effect information: Red to reddish-brown water throughout Raritan and Sandy Hook bays; slight hypoxia (as low as 3.3 mg/l) subsequent to bloom; no fauna kills reported as occurred in 1988; toxicity not suspected.