General Information

Event name: NL-94-003
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (RIVO-DLO Early Warning System. DLO Netherlands Institute for Fishery Research.)
Event occurred before in this location: Yes (This bloom was the first one since a number of years without Dinophysis.)
Individuals to contact: PEPERZAK, Louis , Cadee, Gerhard , DIJKEMA, Renger

Location & Date

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Location: Latitude: , Longitude:
General location information: , North Sea.
HAB Area code(s): NL-02
Additional location information: 10 Km off Noordwijk. The bloom was detected in week 30, moving north with the residual current. The bloom reached the Marsdiep, the southernmost inlet of the Wadden Sea (600 cell/L) in week 32, and subsequently, increased cell counts (40-70 cell/L) were reported in one station in the Wadden Sea.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: July.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (5,000 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: 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: The bloom took place offshore.

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: A preventive, partial closure of mussel culture areas in the western Wadden Sea was effectuated for one week.
Additional harmful effect information: As this bloom took place offshore, no toxicity was determined in shellfish.
Updated at 02:12 on 2 Dec 2019