General Information

Event name: NL-23-002
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 56 - 150 ug TTX / kg)
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: 51.719444, Longitude: 4.014167
General location information: Lake Grevelingen, South West
HAB Area code(s): NL-03
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2023-06-19
Start: 2023-06-19, End: 2023-07-11
Quarantine levels dates (yyyy/mm/dd): First detection: 2023-06-21, End: 2023-07-13
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus:
Co-Ocurring Species/Genus: Centrodinium elongatum Kofoid 1907 ( cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: Good Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity: 2-4
Temperature (°C): 21.3 Oxygen saturation %: Current Direction: SE
Sechhi disk (m): Salinity: 29 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 20.2 °C, Min: 21.3 °C
Salinity Range During Event:
Bloom location in the water column: Whole column
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses: Closure of the area. No direct losses.
Management decision: Closure of the area. Restrictions on fisheries / harvest.
Additional harmful effect information:
Created at 00:00 on 30 Nov -1
Updated at 01:19 on 19 Apr 2024
Checked at 00:00 on 30 Nov -1