General Information

Event name: US-94-007
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 (at least since the 1960s).)
Individuals to contact: OLSEN, Paul

Location & Date

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Location: Latitude: , Longitude:
General location information: Raritan Bay., New Jersey.
HAB Area code(s): US-09
Additional location information: South shore area, to Sandy Hook Bay (centrering off East Keansburg).
Bloom event dates (yyyy/mm/dd): Event Date:1994-08-03
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: June-September - intermittent blooms peak early August (approximately 3 August).


Causative organism known: Yes
Causative Species/Genus: Euglena sp. ( cells/L)
Euglena/Eutrepia spp.
Chaetoceros spp. ( cells/L)
Thalassiosira sp. ( cells/L)
Skeletonema costatum ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: Levels up to > 115 mg/L Chl™. µg/l
Additional bloom information: Maximum cell counts of dominant species >20,000,000 cells/L
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): 0.5 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: 24 °C, Min: 23 °C
Salinity Range During Event: Max: 22, Min: 20
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information: Dissolved oxygen 6-9 mg/L.

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 NJOEP/EPA and Monmouth county Health Department.
Additional harmful effect information: Heavy red to brown water discoloration, flocculent deposits on shore, possile hypoxia from algal decomposition; has been associated with occasional localized fish kills (none in 1994).