Harmful Algal Information System: Event US-90-027

General Information

Event name:	US-90-027
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.)
Individuals to contact:	OLSEN, Paul

Location & Date

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Location:	Latitude: , Longitude:
General location information:	Sandy Hook Bay., New Jersey. HAB Area code(s): US-09
Additional location information:	Sandy Hook Bay, New Jersey, especially the south shore area; Shrewsbury River, especially in the vicinity of Branchport Creek tributary.
Bloom event dates (yyyy/mm/dd):	Event Date:1990-06-29 Start: 1990-06-25, End: 1990-06-30
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Katodinium rotundatum (40,000,000 cells/L) Dominant species
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	Chlorophyll a in bloom from 25 to 120 痢/L on µg/l
Additional bloom information:	Surface and bottom samples by Kemmerer from US EPA helicopter.
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:

Bloom location in the water column:

Growth:

In situ

Growth Comments

Additional Environmental information:

Temperature range 22.5 to 23.2 C (surface), 20,5 to 22.3 C (bottom), slight stratification, salinity 21.9 to 24.0 � (surface), dissolved oxygen 3.36 to 9.9 mg/L (surface); 3.79 to 8.55 (botton).

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:

Joint surveillance by NJ DEP/US EPA: continuation of the estuarine phytoplankton - dissolved oxygen survey initiated in 1989; New York Bight and coastal monitoring by these agencies ongoing.

Additional harmful effect information:

Red to reddish-brown water throughout Raritan and Sandy Hook bays; slight hypoxia (as low as 3.3 mg/l) subsequent to bloom; no fauna kills reported as occurred in 1988; toxicity not suspected.