Harmful Algal Information System: Event FR-93-025

General Information

Event name:	FR-93-025
Country:	FRANCE
Nature of the harmful event:	Seafood toxins
Event directly affected:
Toxicity detected:	Yes
Associated syndrome:
Unexplained toxicity:	Yes
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme:	Yes
Event occurred before in this location:	No
Individuals to contact:	CARRERAS, Antoni

Location & Date

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Location:	Latitude: , Longitude:
General location information:	Toulon Roads (site 100)., Eastern Mediterranean Sea. HAB Area code(s): FR-14
Additional location information:	Area 8.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	March to May then again in November and December.

Microalgae

Causative organism known:	No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:	No toxic or harmful phytoplankton species.
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:

Growth Comments

Additional Environmental information:

Toxin Assay Information

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Mussel (digestive gland)	Okadaic Acid			Bioassay-Mouse
Mussel	Okadaic Acid		Absence	LC
Mussel	Saxitoxins	STX	small quantities	LC

Kit used:

Type of kit used:

Additional information:

Very rapid mortalities of mice with acetone extract of mussel digestive gland. The HPLC analysis showed the absence of DSP toxins, and the presence in April of very small quantities of PSP toxins, not sufficient to explain the mortality of mice. In December, no DSP and no PSP toxins were found in samples.

Economic losses:

Management decision:

Ban of shellfish marketing, from March 30 to June 4 and from November 25 to ?? (the toxicity is still present in April 94).

Additional harmful effect information:

Updated at 02:21 on 3 Dec 2019