Harmful Algal Information System: Event US-90-013

General Information

Event name:	US-90-013
Country:	UNITED STATES
Nature of the harmful event:	Mass mortalities
Event directly affected:
Toxicity detected:	No
Associated syndrome:	NSP , Aerosolized toxins effects
Unexplained toxicity:	No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	Yes
Event occurred before in this location:	Yes (1986 - G. breve bloom extended along much of Texas coast, although unsure if bloom occurred in the ship channel at that time.)
Individuals to contact:	COX, Frank , REISINGER, Tony

Location & Date

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Location:	Latitude: , Longitude:
General location information:	Laguna Madre., Texas. HAB Area code(s): US-18
Additional location information:	In ship channel running off Laguna Madre near Brownsville
Bloom event dates (yyyy/mm/dd):	Start: 1990-11-01, End: 1991-03-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	November 1990 through March 1991 (continuing)

Microalgae

Causative organism known:	Yes
Causative Species/Genus:	Gymnodinium breve (300,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:
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:

Growth Comments

Probably advected - Satellite imagery of November 18, 1990 showed a 'slug' of 20.7� C water at mouth of Laguna Madre which may have affected ship channel, but nothing positive.

Additional Environmental information:

End of ship channel farthers from coastal access. In November, temperatures were around 19� c.