General Information

Event name: NL-86-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Positive rat bioassay)
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): mussel
Report the outcome of a monitoring programme: Yes (National Shellfish Monitoring)
Event occurred before in this location: Yes (1976, 1979, 1981)
Individuals to contact: POELMAN, Marnix

Location & Date

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Location: Latitude: 53.336667, Longitude: 5.319722
General location information: Wadden Sea, Meep
HAB Area code(s): NL-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1986-09-08
Start: 1986-09-08, End: 1986-10-27
Quarantine levels dates (yyyy/mm/dd): First detection: 1986-09-22, End: 1986-11-17
Additional date-related information: Toxicity started, dissapeared and returned.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (100 cells/L)
20-100 c/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: 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: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column: Whole column
Growth: Advected
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mussels Okadaic Acid OA Positive Bioassay-Rat
Kit used: No Type of kit used:
Additional information: Positive rat bioassay. No chemical analysis performed.
Economic losses: The indusrty was closed for 2 weeks, followed by a 4 week opening. Then toxicity returned for 4 weeks.
Management decision: Closure for shellfish fisheries.
Additional harmful effect information:
Created at 04:49 on 16 Apr 2015