General Information

Event name: NL-20-001
Nature of the harmful event:
High Phyto concentration , Mass mortalities , Foam/Mucilage in the coast
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: No
Individuals to contact: POELMAN, Marnix

Location & Date

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Location: Latitude: 52.105278, Longitude: 4.260833
General location information: Northsea, Coastline Scheveningen
HAB Area code(s): NL-02
Additional location information: A very temporary and local event. Due to unfavorable conditions coming together.
Bloom event dates (yyyy/mm/dd): Event Date:2020-05-11
Start: 2020-04-19, End: 2020-05-11
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom started in April 2020, collapsed in May


Causative organism known: Yes
Causative Species/Genus: Phaeocystis globosa (38000000 cells/L)
Conditions at event site and date not known
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Philippart, K., A. Blauw, H. Bolhuis, K. Brandenburg, C. Brussaard, T. Gerkema, P. Herman, A. Hommersom, P. Jacobs, M. Laanen, M. van Leeuwe, A. van den Oever, S. Peters, M. Philippart, J. Pitarch, T. Prins, K. Ruddick, L. Spaias, D. van de Waal, D. Van der Zande & A. Zuur, 2020. Quick Scan Zeeschuim. Rapport van het Koninklijk Nederlands Instituut voor Onderzoek der Zee (NIOZ-NWOi), Bureau Waardenburg BV, Deltares, Highland Statistics, Italian National Research Council (CNR), Koninklijk Belgisch Instituut voor Natuurwetenschappen (KBIN), Nederlands Instituut voor Ecologie (NIOO-KNAW), Rijkswaterstaat (RWS-WVL), Technische Universiteit Delft (TUD), Universiteit van Amsterdam (UvA), Universiteit Utrecht (UU), Rijksuniversiteit Groningen (RUG) & Water Insight BV. Texel, mei 2020.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction: N
Stratified water: No Oxygen content (nL/L): Wind velocity: 13.9 m/s
Temperature (°C): 11 Oxygen saturation %: Current Direction: NNE
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
Growth: Advected
Growth Comments Beaten up foam was most likely wind-driven to accumulate.
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:
Management decision:
Additional harmful effect information: On May 11th five water sports enthusiasts passed away due to a meters high sea foam in Scheveningen. This was probably caused by a combination of high winds and an exceptionally large amount of foam algae.
Created at 03:28 on 20 Apr 2021
Updated at 08:13 on 16 Jun 2022