General Information

Event name: US-04-011
Nature of the harmful event:
Mass mortalities
Event directly affected:
Natural Fish
Toxicity detected: Yes (Approximate range: suspected)
Associated syndrome:
Unexplained toxicity: Yes (suspected ichthyotoxin)
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Statewide fish kill hotline and response to HAB events)
Event occurred before in this location: Yes (1990 and 1996)
Individuals to contact: LANDSBERG, Jan , WOLNY, Jennifer

Location & Date

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Location: Latitude: , Longitude:
General location information: Indian River Lagoon, near Fort Pierce, FL; St, Florida east coast
HAB Area code(s): US-15
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: ? 08/15/04-08/31/04 for ongoing fish kills and bloom.


Causative organism known: Yes
Causative Species/Genus: Takayama pulchella (8,800,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Steidinger, K.A., Landsberg, J.H., Truby, E.W. and Roberts, B. S. 1998. First report of Gymnodinium pulchellum Larsen 1994 (Dinophyceae) in North America and associated fish kills in the Indian River, Florida. J. Phycol. 34: 431-437.

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
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Takayama pulchella Brevetoxins ELISA
Kit used: No Type of kit used:
Additional information: Toxin:? suspected Pb-Tx. Negative for Pb-Tx - unidentified ichthyotoxin suspected.
Economic losses:
Management decision:
Additional harmful effect information: Unconfirmed reports of respiratory irritation.