Harmful Algal Information System: Event US-94-006

General Information

Event name:	US-94-006
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 (1993: <1,000 to 250,000 cells/ml (January-March, August-November); 1992: 1,000 to 1,000,000 cells/ml (January-December); 1991: < 10,000 cells/ml (Janurary-June); 1990: <10,000 cells/ml (May-December); 1989: <24,000 cells/ml (April-September); 1988: 1,000 to 500,000 cells/ml (June-August); 1985, 1986: > 1,000,000 cells/ml.)
Individuals to contact:	NUZZI, Robert

Location & Date

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Location:	Latitude: , Longitude:
General location information:	Great South Bay., New York. HAB Area code(s): US-08
Additional location information:	The bloom was present in the central portion of the bay, from the Robert Moses Causeway bridge to the waters off Sayville.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	June-July, with peack concentrations approaching 1,000,000 cells/ml occurring in late June. A secondary bloom began in mid-August and was still present in late October, when densities up to 12,000 cells/ml were found.

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Aureococcus anophagefferens (1,000,000, cells/L) Late June Aureococcus anophagefferens (12,000,000 cells/L) Mid-August
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:
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: 28 °C, Min: 18 °C

Salinity Range During Event:

Max: 29, Min: 24

Bloom location in the water column:

Growth:

In situ

Growth Comments

Probably.

Additional Environmental information:

Dissolved oxygen: 5.8 - 11.3 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:

Increase the frequency of monitoring activities.

Additional harmful effect information:

Effects: Primarily aesthetic - water column discoloration (brownish) and reduced transparency. Effects on various shellfish species have previously been reported.