General Information

Event name: NL-94-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Mussels (Mytilus edulis).
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: No
Individuals to contact: PEPERZAK, Louis

Location & Date

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Location: Latitude: , Longitude:
General location information: Lake Grevelingen.,
HAB Area code(s): NL-03
Additional location information: Western part of the lake.
Bloom event dates (yyyy/mm/dd): Event Date:1994-07-20
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: July- October.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (4,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: D. acuminata counts reverted to nil by the first week of September.
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: 18 °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: The opening of the oyster harvesting season was delayed until October.
Additional harmful effect information: No toxicity was found in oysters (Ostrea edulis). As the monitoring program for toxicity is restricted to the oyster harvesting starting in September, toxicity was only detected after a number of people became intoxicated after aeating mussels, hand-colle
Updated at 04:10 on 28 Feb 2018