General Information

Event name: US-98-008
Nature of the harmful event:
Water Discoloration
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Normal spring and summer occurrences.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Raritan - Sandy Hook Bay., New Jersey.
HAB Area code(s): US-09
Additional location information: Northern Monmouth County coast.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: May 19-27, 1998; June 17-24, 1998; July 24-30, 1998


Causative organism known: Yes
Causative Species/Genus: Rhizosolenia spp. ( cells/L)
Skeletonema costatum ( cells/L)
Thalassiosira spp. ( cells/L)
Asterionella glacialis ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Total cell densities to 50,000,000 cells/L
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: 25 °C, Min: 0 °C
Salinity Range During Event: Max: 28, Min: 19
Bloom location in the water column:
Growth: Advected
In situ
Growth Comments in situ growth, or advected from adjacent nearshore areas.
Additional Environmental information:

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: Maintain current surveillance.
Additional harmful effect information: Brown water; algal foams, floc Subsequent bottom hypoxia (1.2-2.7 mg/L - late summer, one to three miles off southern Monmouth - northern Ocean Co. (Belmar to Seaside), south of primary bloom area.