General Information

Event name: US-98-031
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity:
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (Spatial and temporal occurrence patterns repeated every year since 1990 in Mississippi River plume, since 1993 in Terrebonne Bay estuary)
Individuals to contact: DORTCH, Quay

Location & Date

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Location: Latitude: , Longitude:
General location information: , Louisiana
HAB Area code(s): US-18
Additional location information: Eutrophic, shallow estuaries and the highly eutrophic plume of the Mississippi River
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: all year occurrence, higher in fall-spring


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia multiseries ( cells/L)
Pseudo-nitzschia delicatissima ( cells/L)
Pseudo-nitzschia pseudodelicatissima ( cells/L)
Pseudo-nitzschia pungens ( cells/L)
Pseudo-nitzschia subfraudulenta ( cells/L)
Pseudo-nitzschia americana (Hasle) Fryxell 1993 ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 30 °C, Min: 9 °C
Salinity Range During Event: Max: 36, Min: 2
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: