General Information

Event name: NL-16-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 20-250 ug TTX / kg)
Associated syndrome: OTHER
Unexplained toxicity: Yes (Confirmation of source is in prep.)
Species implicated in toxin transmission (transvector): Most likely bacteria (Vibrio)
Report the outcome of a monitoring programme: Yes (Monitoring Shellfish Quality Netherlands)
Event occurred before in this location: Yes (2015 first detection)
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:
Bloom event dates (yyyy/mm/dd): Event Date:2016-06-23
Start: 2016-06-15, End: 2016-07-13
Quarantine levels dates (yyyy/mm/dd): First detection: 2016-06-23, End: 2016-07-20
Additional date-related information:


Causative organism known: No
Causative Species/Genus: Vorticella cincta Müller 1832 ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Potentially a microbiological source. This is under investigation.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: 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 250 mg TTX LC-MS
Mussels Tetrodotoxins TTX 44 mg TTX / kg LC-MS
Kit used: Type of kit used:
Additional information:
Economic losses: Start of season. Area is used for storage. New processing routes required. High economic losses due to less sales, need to be confirmed.
Management decision: Closure of the associated area.
Additional harmful effect information:
Created at 11:34 on 22 Mar 2017
Updated at 02:18 on 14 Apr 2021