General Information

Event name: US-91-005
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 (Has been subdominant in annually recurring red tides in the NJ northern estuarine and coastal region; reported as dominant red tide species in adjacent Long Island.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Hudson-Raritan estuary., New York / New Jersey.
HAB Area code(s): US-09
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1991-05-25
Start: 1991-05-20, End: 1991-06-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Peak about May 25.


Causative organism known: Yes
Causative Species/Genus: Prorocentrum minimum (25,000,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Warm, clear. Turbidity (NTU): Wind direction:
Stratified water: Yes 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: Water clear but becoming turbid; generally shallow (<5 m). Slight stratification in deeper areas.

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: Continued monitoring by NJDEP/USEPA.
Additional harmful effect information: Red water in estuary, especially in Sandy Hook Bay south shore area.