General Information

Event name: NL-89-009
Nature of the harmful event:
High Phyto concentration
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 (Phytoplankton Monitoring program. Rijkswaterstaat's North Sea Directorate.)
Event occurred before in this location: No
Individuals to contact: WETSTEYN, L.P.M.J

Location & Date

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Location: Latitude: , Longitude:
General location information: , Wadden Sea.
HAB Area code(s): NL-01
Additional location information: stations W30, W420, W590, E250.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: July-October.


Causative organism known: Yes
Causative Species/Genus: Gyrodinium aureolum (150-1,900 cells/L)
Station W590
Gyrodinium aureolum (100-600 cells/L)
Station W420
Gyrodinium aureolum (600 - 6,50 cells/L)
Station w30
Gyrodinium aureolum (200 cells/L)
Station E250
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Founded in a few samples.
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:
Management decision: Although the toxicity measured by the rat bioassays was low, closure of musselproduction in the western Wadden sea during October-November was necessary.
Additional harmful effect information: In 1989 DSP was measured in samples from the western Wadden sea.
Updated at 04:07 on 28 Feb 2018