Harmful Algal Information System: Event US-94-007

General Information

Event name:	US-94-007
Country:	UNITED STATES
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).

Microalgae

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 Chlª. 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:

Growth:

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).