General Information

Event name: US-94-010
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 for several years.)
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 1994 -January 1995.


Causative organism known: Yes
Causative Species/Genus: Synechococcus elongatus (7,100,000, cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: Levels up to > 30 g/L Chl. µg/l
Additional bloom information: Synechococcus elongatus can co-occur with small (<10 m) centric diatoms and other cyanobacteria.
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: 34 °C, Min: 18 °C
Salinity Range During Event:
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 hypersaline (> 50). Resuspension events from winds and tidal action common.

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: None in 1994, although restoration of the bay is part of a long-range interagency plan.
Additional harmful effect information: Effects: Yellow-green to pea-green discolored seawater with decreased water clarity. In a previous year, sponge mortality coincidental with bloom areas.