General Information

Event name: US-09-012
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins
Event directly affected:
Planktonic life , Natural Fish , Shellfish
Toxicity detected: Yes
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Pyrodinium bahamense
Report the outcome of a monitoring programme: Yes (Fish and Wildlife Research Institute HAB Monitoring Program: Event Response)
Event occurred before in this location: Yes (Annually since 2004)
Individuals to contact: SCOTT, Paula

Location & Date

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Location: Latitude: , Longitude:
General location information: Tampa Bay, West Coast of Florida
HAB Area code(s): US-16
Additional location information: Latitude: 28.031490 N, 27.875020 S Longitude: -82.537880 E, -82.698920 W, 13 miles north to south
Bloom event dates (yyyy/mm/dd): Start: 2009/06/17, End: 2009/09/09
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pyrodinium bahamense (3,761,300 cells/L)
saxitoxin producer
Co-Ocurring Species/Genus: Pseudo-nitzschia spp. (267,000 cells/L)
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): 2.5-9.9 Wind velocity:
Temperature (°C): 27.1-34.0 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 14.7-31.9 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 34 °C, Min: 27.1 °C
Salinity Range During Event: Max: 31.9, Min: 14.7
Bloom location in the water column: Whole column
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Hard clams and oysters Saxitoxins Other
Kit used: Yes Type of kit used:
Additional information: 3.10 ug STX eq./L seawater
Economic losses: Shellfish harvesting is prohibited in the areas affected. The bloom did not reach the lower portion of the bay when harvesting is permitted
Management decision: Shellfish harvesting closures when tested above the regulatory limit. Areas remain closed until two consecutive mouse bioassays, collected at least 7 days apart return with results below 80 micrograms STX/100 grams shellfish
Additional harmful effect information: