General Information

Event name: US-91-004
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 (Nuisance blooms have occurred only occasionally (usually localized) on this relatively small estuary. Occasional red tides in the adjacent coastal waters, dominated by Prorocentrum micans/redfieldi, have had greater adverse impact (i.e. complaints of respiratory irritation by bathers); occurrences were in 1968, 1972 and 1980-82.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Shark River., New York.
HAB Area code(s): US-09
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1991-07-30
Start: 1991-07-25, End: 1991-08-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Peak July 30.


Causative organism known: Yes
Causative Species/Genus: Prorocentrum redfieldii ( cells/L)
Prorocentrum minimum ( cells/L)
Gyrodinium sp. ( cells/L)
Euglena sp. ( cells/L)
Katodinium rotundatum ( cells/L)
Chroomonas spp. ( cells/L)
Thalassiosira sp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: concentrations of dominant species to 20,000,000 cells/L.
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:
Growth: Advected
In situ
Growth Comments Probably in-situ but possibly advected near the inlet by tidal action (different species were dominant here than in upper estuary).
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: Surveillance by the Monmouth County Health Dept. in liaison with NJDEP.
Additional harmful effect information: Patches of green water, dark green near head of tide to light green near inlet to Atlantic Ocean.