General Information

Event name: NL-91-007
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Phytoplankton Monitoring program. Tidal Waters Division.)
Event occurred before in this location: No
Individuals to contact: WETSTEYN, L.P.M.J

Location & Date

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Location: Latitude: 51.592222, Longitude: 3.302778
General location information: Delta Area,
HAB Area code(s): NL-03
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1992-05-01
Start: 1992-05-01, End: 1992-09-30
Quarantine levels dates (yyyy/mm/dd): First detection: 1992-05-01, End: 1992-09-30
Additional date-related information: April-September.


Causative organism known: Yes
Causative Species/Genus: Phaeocystis sp. (10,000 - 1 cells/L)
Oosterchelde stations after spring bloom
Phaeocystis sp. (1,000,000 cells/L)
Station WSH April-May.
Phaeocystis sp. (1,000,000 cells/L)
Station WSV April-May
Phaeocystis sp. (2,000,000 cells/L)
Station OSL April-may.
Phaeocystis sp. (4,000,000 cells/L)
Station OSH April-May.
Phaeocystis sp. (11,000,000 cells/L)
Station OSR April-May.
Phaeocystis sp. (1,000 - 10 cells/L)
Westerchelde stations after spring bloom
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Phaeocystis also occurred at stations OSZ, LV, LG and WSS but always with low cell number.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
In situ
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: None. However, Phaeocystis is under interest by the authorities.
Management decision: None.
Additional harmful effect information:
Updated at 06:28 on 16 Apr 2015