General Information

Event name: NL-22-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 1383 ug TTX / kg product)
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (National Shellfihs Toxin monitoring (SSO))
Event occurred before in this location: Yes (since 2020)
Individuals to contact: POELMAN, Marnix

Location & Date

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Location: Latitude: 51.691944, Longitude: 4.114444
General location information: Lake Grevelingen, South West
HAB Area code(s): NL-03
Additional location information: No bloom reported.
Bloom event dates (yyyy/mm/dd): Event Date:2022-06-15
Start: 2022-06-13, End: 2022-06-19
Quarantine levels dates (yyyy/mm/dd): First detection: 2022-06-15, End: 2022-06-19
Additional date-related information: Before 15th of June no toxin reported.


Causative organism known: Yes
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Causative species non algae related
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:
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Japanese ribbon worm Tetrodotoxins TTX 1383 LC-MS
Kit used: No Type of kit used:
Additional information:
Economic losses: Closures for the mussel and oyster industry. No commercial oyster production effected. Mussels rope cultures were closed for 2 weeks.
Management decision: No harvest allowed at levels above 44 ug / kg.
Additional harmful effect information:
Created at 08:09 on 21 Mar 2023