General Information

Event name: US-96-003
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 (Bloom has been on-going since 1991 but the intensity and geographic coverage varies seasonally.)
Individuals to contact: STEIDINGER, Karen A.

Location & Date

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Location: Latitude: , Longitude:
General location information: Florida Bay., Florida.
HAB Area code(s): US-16
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: January 1996 - January 1997.


Causative organism known: Yes
Causative Species/Genus: Synechococcus elongatus (1,000,000, cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: Levels up to > 20 g/L Chl. µg/l
Additional bloom information: The bloom can co-occur with small (<10 m) centric diatoms and other cyanobacteria, particularly coccoid forms.
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: 33 °C, Min: 20 °C
Salinity Range During Event: Max: 38, Min: 33
Bloom location in the water column:
In situ
Growth Comments In situ growth within sub-basins of bay. High residency time within sub-basins, but sub-basins flushed by rain and storm events through narrow channels.
Additional Environmental information: Shallow subtropical lagoon with salinities from essentially freshwater to marine (up to 38.3 0/00). In previous years, the bay has been hypersaline. Resuspension events from winds and tidal action common. Resuspended sediments can change surface discolor

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: Restoration of the bay is the long term goal of an interagency plan, part of the restoration involves freshwater delivery.
Additional harmful effect information: In a previous year, sponge mortality coincidental with bloom areas.