General Information

Event name: FR-94-003
Country: FRANCE
Nature of the harmful event:
Mass mortalities
Event directly affected:
Aquaculture Fish
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (The French Monitoring Network (REPHY).)
Event occurred before in this location: Yes (H. akashiwo was observed a few times before, in Atlantic and Channel waters, but it never reached such concentrations. So it is the first time that this species is associated with fish mortality in France.)
Individuals to contact: SCHWEIBOLD Laura

Location & Date

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Location: Latitude: , Longitude:
General location information: Camaret Bay., Western Brittany.
HAB Area code(s): FR-06
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1994-09-27
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Agoust-September. The responsible species had been observed since later august in this area. On septemebr 27-28 the cells counts increased rapidly.


Causative organism known: Yes
Causative Species/Genus: Heterosigma akashiwo (130,000,00 cells/L)
27-28 Sept.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Rains, followed by sunny weather and absence of wind during a few days, associated with the fast growing of the species, might explain this unexpected increase of concentrations. 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 Comments
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:
Additional harmful effect information:
Updated at 02:23 on 3 Dec 2019