General Information

Event name: NL-07-001
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 54 ug OA /kg)
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (National Shellfish Quality Program)
Event occurred before in this location: No
Individuals to contact: POELMAN, Marnix

Location & Date

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Location: Latitude: , Longitude:
General location information: Lake Grevelingen,
HAB Area code(s): NL-03
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2007-06-18
Start: 2007-06-12, End: 2007-07-03
Quarantine levels dates (yyyy/mm/dd): First detection: 2007-06-12, End: 2007-06-12
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (1700 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 17 °C, Min: 21 °C
Salinity Range During Event:
Bloom location in the water column: Whole column
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Oyster (Crassostra gigas) Okadaic Acid OA Bioassay-Rat
Oyster (Crassostrea gigas) Okadaic Acid OA 54 ug/kg LC-MS
Kit used: No Type of kit used:
Additional information: Toxin concentrations well below threshold values.
Economic losses: Not known.
Management decision: The area was taken into quarantaine. Administrative (registration of harvested shellfish) measures were enforced.
Additional harmful effect information:
Updated at 01:58 on 22 Feb 2018