General Information

Event name: US-89-004
Nature of the harmful event:
Water Discoloration , Foam/Mucilage in the coast
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 (These bloom normally occur earlier or later in the year, however, summer diatom blooms have been common in recent years.)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Raritan / Sandy Hook Bay., New Jersey Coast.
HAB Area code(s): US-09
Additional location information: Most intense and persistent in the stuary.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Mid-July - early September.


Causative organism known: Yes
Causative Species/Genus: Skeletonema costatum ( cells/L)
Dominant species
Cylindrotheca closterium ( cells/L)
Dominant species
Thalassiosira spp. ( cells/L)
Subdominant species
Hemiaulus sinensis ( cells/L)
Subdominant species
Chaetoceros spp. ( cells/L)
Subdominant species
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: >30 to >100 g/L Chl. µg/l
Additional bloom information: Several other dinoflagellates and diatoms species abundant. Total cell counts attaining well in excess of 100,000,000.
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: Max: 27, Min: 21
Bloom location in the water column:
In situ
Growth Comments Primarly in situ except possible in the estuary. C. closterium is the only dominant species more characteristic of the estuary than of these coastal waters.
Additional Environmental information: Water turbid.

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: Continues surveillance, intensive survey of the estuaries area.
Additional harmful effect information: Brown water discoloration throughout, especially in the estuary and adjacent coastal waters. Resultant brown flocculent material and foam deposits on the area shores.