Harmful Algal Information System: Event US-94-012

General Information

Event name:	US-94-012
Country:	UNITED STATES
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:	No
Individuals to contact:	DORTCH, Quay

Location:	Latitude: , Longitude:
General location information:	, Lousiana. HAB Area code(s): US-17
Additional location information:	Louisiana continental shelf from barrier islands to at least 20 miles offshore south of Terrebonne Bay.
Bloom event dates (yyyy/mm/dd):	Event Date:1994-03-07
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	7 March (star of bloom unknown).

Causative organism known:	Yes
Causative Species/Genus:	Heterosigma sp. (10,000 cells/L) Heterosigma cf. Akashiwo. Nearest shore. Heterosigma sp. (5,000,000 cells/L) Heterosigma cf. Akashiwo. Offshore.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:	Surface water samples. This species was observed earlier at low levels in Terrebonne Bay estuary, along with possible benthic palmelloid stage.
Event-related bibliography:

Nutrient information:

Temperature Range During Event:

Max: 19 °C, Min: 17 °C

Salinity Range During Event:

Max: 29, Min: 21

Bloom location in the water column:

Growth:

Growth Comments

Not known.

Additional Environmental information:

Bloom dispersed by severe storm and not seen again that year, obviating need for over flights.

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 (over flights planned before bloom dispersed by strom).

Additional harmful effect information:

Effect: Water discoloration.