General Information

Event name: US-94-013
Nature of the harmful event:
High Phyto concentration
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 (Occurs annually in very predictable pattern in coastal zone with large blooms in April (based on five-year data). Occurrence in estuary less predictable (based on two-ywar data). Historical data indicate presence in high numbers back to 1950s.)
Individuals to contact: DORTCH, Quay

Location & Date

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Location: Latitude: , Longitude:
General location information: Louisiana continental shelf and estuaries., Louisiana.
HAB Area code(s): US-17
Additional location information:
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: All seasons sampled (March-October), peak concentrations occurred in April and October.


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia spp. (10,000,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Pseudonitzschia spp., present in 64% of samples collected in shelf and estuarine areas. Species not generally identified, but earlier studies have identified P. multiseries, P. pungens and P. pseudodelicatissima.
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: 32 °C, Min: 9 °C
Salinity Range During Event: Max: 36,
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information: Most abundant at 22-32, and at 21 C. Occurs more frequently and at higher concentrations in coastal zone in comparison with estuary. Blooms in moderately well-mixed water.

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.
Additional harmful effect information: No monitoring for effects.