General Information

Event name: FR-93-002
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: No
Individuals to contact: SCHWEIBOLD Laura

Location & Date

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Location: Latitude: , Longitude:
General location information: Mont St. Michel Bay (site 023)., Northern Brittany.
HAB Area code(s): FR-04
Additional location information: Area 3.
Bloom event dates (yyyy/mm/dd): Event Date:1993-03-22
Start: 1993-03-22,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Thalassiosira gravida (98,100 cells/L)
Thalassiosira rotula/gravida
Skeletonema costatum (72,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 3.11 mg/m≥ Chl™.Phaeopigments: 0.84 mg. m-3 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): 9.1 Oxygen saturation %: Current Direction:
Sechhi disk (m): 4 Salinity: 34.8 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments No data available.
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: Continued surveillance.
Additional harmful effect information: Discolored water.
Updated at 02:07 on 3 Dec 2019