General Information

Event name: FR-90-007
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 (Alexandrium minutum: 1989 (3,000,000 cells/L))
Individuals to contact:

Location & Date

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Location: Latitude: , Longitude:
General location information: Morlaix River, Northern Brittany.
HAB Area code(s): FR-05
Additional location information: Area 3.
Bloom event dates (yyyy/mm/dd): Start: 1990-06-13, End: 1990-06-22
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Gonyaulax spinifera (2,300,000 cells/L)
Alexandrium lusitanicum (2,500,000 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: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): 2.5-3.5 Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 18 °C, Min: 15 °C
Salinity Range During Event: Max: 32, Min: 22
Bloom location in the water column:
Growth Comments Probably in situ growth for Alexandrium minutum, which has developped in the river since 1989 (presence of systs in silt). No data for Gonyaulax spinifera.
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: Increased surveillance.
Additional harmful effect information: Reddish and brown water. The sheet of discolored water was located at first at the mouth of the river, then spread out into the river.
Updated at 12:06 on 3 Dec 2019