General Information

Event name: NL-02-002
Nature of the harmful event:
High Phyto concentration , Seafood toxins
Event directly affected:
Toxicity detected: Yes
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Monitoring Shellfish Quality Netherlands)
Event occurred before in this location: Yes
Individuals to contact: POELMAN, Marnix

Location & Date

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Location: Latitude: 53.350556, Longitude: 5.235278
General location information: Waddenzee, Oosterom
HAB Area code(s): NL-01
Additional location information: Bloom covered approx. 3000 km2 ICES fishing area: IV c.
Bloom event dates (yyyy/mm/dd): Start: 2002-08-12, End: 2002-10-28
Quarantine levels dates (yyyy/mm/dd): First detection: 2002-11-04, End: 2002-12-19
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (400 cells/L)
Toxin appearance after bloom disappearance.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: "Bloom" remained after severe storm. Toxin was detected 2 weeks after appearance D. acuminata. Toxin thresholds were exceeded 12 weeks after appearance bloom and 1 week after disappearance bloom.
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
Mussel Okadaic Acid OA 45ug/kg LC
Mussel Okadaic Acid OA Bioassay-Rat
Kit used: Type of kit used:
Additional information: Positieve animal assay
Economic losses: The industry was shut down till the toxins disappeared.
Management decision: Closure.
Additional harmful effect information:
Updated at 01:56 on 22 Feb 2018