General Information

Event name: NL-15-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 20-124 g TTX/kg)
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Potentially bacteria, through mussel and oyster
Report the outcome of a monitoring programme: Yes (Monitoring Shellfish Quality Netherlands)
Event occurred before in this location: No
Individuals to contact: POELMAN, Marnix

Location & Date

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Location: Latitude: 51.473889, Longitude: 4.162778
General location information: Yerseke Bank, Oosterscheldt
HAB Area code(s): NL-03
Additional location information: Started June 2nd. Toxin reported in 16 out of 401 samples.
Bloom event dates (yyyy/mm/dd): Event Date:2015-06-02
End: 2015-08-06
Quarantine levels dates (yyyy/mm/dd): First detection: 2015-09-01,
Additional date-related information: Data was derived from post sampling analyses.


Causative organism known: No
Causative Species/Genus:
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): 18 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 18 °C, Min: 20 °C
Salinity Range During Event:
Bloom location in the water column: Whole column
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Oyster Tetrodotoxins TTX 127 LC-MS
Mussels Tetrodotoxins TTX 33 LC-MS
Kit used: Type of kit used:
Additional information: LC-MSMS According to adapted method A. Turner (2015).
Economic losses: None, due to post event sampling.
Management decision: Risk Assessment was performed. Specific limit was set for Dutch production areas (20 ug TTX/kg).
Additional harmful effect information:
Created at 11:20 on 22 Mar 2017
Updated at 01:51 on 22 Feb 2018