General Information

Event name: NL-19-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 20 ug /kg mussels, 153 ugk kg mussel)
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (National Food Safety Programme)
Event occurred before in this location: Yes (since detection in 2015)
Individuals to contact: POELMAN, Marnix

Location & Date

[View larger map]
Location: Latitude: 51.486667, Longitude: 4.113056
General location information: Yerseke Bank, Eastern Scheldt
HAB Area code(s): NL-03
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2019-07-22
Start: 2019-06-20, End: 2019-07-06
Quarantine levels dates (yyyy/mm/dd): First detection: 2019-06-19, End: 2019-07-05
Additional date-related information:


Causative organism known: No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 4 mg/l µg/l
Additional bloom information: Doubts on phytoplanktonic natre of the occurence.
Event-related bibliography:

Environmental Conditions

Weather: Sunny Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): >20 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 30 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °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 153 LC-MS
Mussel Tetrodotoxins TTX 20 LC-MS
Kit used: Yes Type of kit used: Luminex
Additional information: LC-MS-MS according to WFSR proocols
Economic losses: closures of fisheries for oyster outside of the oyster harvesting season, and relaying areas for shellfish
Management decision: Closure for harvest
Additional harmful effect information:
Created at 03:22 on 5 Mar 2020
Updated at 02:16 on 14 Apr 2021