General Information

Event name: NL-09-001
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 (National Shellfish Quality Program)
Event occurred before in this location: Yes
Individuals to contact: POELMAN, Marnix

Location & Date

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Location: Latitude: , Longitude:
General location information: Lake Grevelingen, Delta area
HAB Area code(s): NL-03
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2009-08-25
Start: 2009-07-14, End: 2009-09-29
Quarantine levels dates (yyyy/mm/dd): First detection: 2009-07-14, End: 2009-09-29
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (3200 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Decissions made on closures of the area, by the competent authority. Product Board of Fish

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: 16 °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
None Okadaic Acid LC-MS
None Okadaic Acid Bioassay-Rat
Kit used: No Type of kit used:
Additional information: Chemical testing was performed using VHP-LC-MS-MS No toxins were found.
Economic losses: Not known.
Management decision: The area was taken into quarantaine.
Additional harmful effect information:
Updated at 01:59 on 22 Feb 2018