General Information

Event name: US-90-013
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: No
Associated syndrome: Aerosolized toxins effects , NSP
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)


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 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.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision: Shellfish harvesting bans south of Port Mansfield from November 1990 to present (March 1, 1991 - continuing)
Additional harmful effect information: Fish Kills and limited reports of aerosol (respiratory irritation)
Updated at 06:19 on 2 Nov 2020