General Information

Event name: FR-92-011
Country: FRANCE
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 (1989 (510,000,000 cells/L); 1990 (1,000,000 cells L-); 1991 (26,000,000 cells L-).)
Individuals to contact:

Location & Date

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Location: Latitude: , Longitude:
General location information: Audierne Bay., SOUTHERN BRITTANY.
HAB Area code(s): FR-07
Additional location information: Area 4.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: February 10 to March 24, and November 23 to December 8.


Causative organism known: Yes
Causative Species/Genus: Chaetoceros armatum (1,120,000 cells/L)
during Feb-March.
Chaetoceros armatum (8,520,000 cells/L)
during Nov-Dec.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: Chl a: 1.47 to 592.6 mg.m(-3) (March); 1.28 t µg/l
Additional bloom information:
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: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
Growth Comments Probably advected population.
Additional Environmental information: Temperature: 8.2 to 9.8 C (March), 11.2 to 13 C (Nov). Salinity: 34 to 35 (March), 35 to 36 (Nov). Turbidity: 2.8 to 15 N.T.U. (March), 4 to 9.5 N.T.U (Nov).

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: Continued surveillance.
Additional harmful effect information: Brown to black water.
Updated at 02:00 on 3 Dec 2019