General Information

Event name: FR-91-006
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 (In 1989 (510,000,000 cells/L).In 1990 (1,000,000 cells/L).)
Individuals to contact:

Location & Date

[View larger map]
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: April 11 and November 12.


Causative organism known: Yes
Causative Species/Genus: Chaetoceros armatum (26,240,000 cells/L)
in November
Chaetoceros armatum (4,840,000 cells/L)
In April.
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: 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:
In situ
Growth Comments Probably in situ growth.
Additional Environmental information: Temperature: 10.8 C (April), 12.5 C (November). Salinity: 32.4 (April), 35 (November). Turbidity: 37.5 N.T.U. (April), 11 N.T.U. (November).

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: Green-brown to brown water. A sheet about 500 m in April.
Updated at 12:22 on 3 Dec 2019