General Information

Event name: US-99-008
Nature of the harmful event:
Water Discoloration , High Phyto concentration
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
Individuals to contact: MONCREIFF, Cynthia A.

Location & Date

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Location: Latitude: 30.220800, Longitude: -89.111783
General location information: Coastal waters of Mississippi., Gulf of Mexico, Florida.
HAB Area code(s): US-17
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1999-04-29
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Initial and final date: Not known.


Causative organism known: Yes
Causative Species/Genus: Prorocentrum sp. (84,000 cells/L)
Phytoplankton roughly half dinoflagellates; P. Micans, P. Gracile, and P. Mexicanum dominant species present
Prorocentrum micans ( cells/L)
Prorocentrum mexicanum ( cells/L)
Prorocentrum gracile ( cells/L)
Prorocentrum minimum ( cells/L)
Co-Ocurring Species/Genus: Leptocylindrus danicus ( cells/L)
Rhizosolenia setigera ( cells/L)
Chlorophyll concentration, if known: Not performed. µg/l
Additional bloom information: Causative species: Prorocentrum species- P. micans, P. mexicanum, P. gracile, P. minimum. Add. esp: Leptocylindrus danicus, Rhizosolenia setigera; other centric and pennate diatoms. (~ 84,000 cel/L) A list of other genera of microalgae (predominantly di
Event-related bibliography: None

Environmental Conditions

Weather: Variable. Turbidity (NTU): Wind direction: SW
Stratified water: No Oxygen content (nL/L): Wind velocity: 7- 10
Temperature (°C): 30 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 25 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
In situ
Growth Comments Assume in situ growth. Prorocentrum reported to be benthic; species observed in phytoplankton may have3 been displaced from bottom.
Additional Environmental information: Subsurface / throughout water column; water depth shallow (<2m).

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: None reported.
Management decision: None taken.
Additional harmful effect information: None reported.