General Information

Event name: FR-95-003
Country: FRANCE
Nature of the harmful event:
Mass mortalities
Event directly affected:
Planktonic life , Natural Fish , Aquaculture Fish , Shellfish
Toxicity detected: Yes
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (Before 1995, it was primarily observed along the west and south coast of Brittany, and between 1976 and 1987, high concentrations of this species were associated with harmful events for scallops: post-larval mortalities, inhibited juvenile growth,)
Individuals to contact: SCHWEIBOLD Laura

Location & Date

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Location: Latitude: , Longitude:
General location information: , ATLANTIC COAST.
HAB Area code(s): FR-07
Additional location information: Before 1995 it was primarily observed along the West and South coast of Brittany.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: The first observation were made on late May in Western Brittany, then there was an extension along Southern Brittany (laye June), then towards South. The event finished from August to October, depending on the areas.


Causative organism known: Yes
Causative Species/Genus: Gymnodinium sp. ( cells/L)
Gymnodinium cf. Nagasakiense
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: The species wich is present in french waters is similar to three species of Gyrodinium or Gymnodinium. Its name is consequently Gymnodinium cf. nagasakiense=Gyrodinium cf. aureolum=Gymnodinium cf. mikimotoi.
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 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: The consequences were very important for mussels fisheries (some of them lost their whole production), sometimes for oyster fisheries, fish in cages, etc...
Management decision:
Additional harmful effect information: In June-July 1995, the exceptional blooms along the Atlantic coasts led to massive kills of all sorts of marine animals: fish (wild one or in cages), shellfish (mussels, oysters...) gastropods, urchins, worms, etc... The bloom was extremely important, con
Updated at 12:43 on 2 Dec 2019