General Information

Event name: ZAF-48-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Seafood toxins
Event directly affected:
Natural Fish , Birds , Humans
Toxicity detected: Yes
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Donax serra, Mytilus meridionalis
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (1932)
Individuals to contact: MANSFIELD, Lisa , SCHWEIBOLD Laura

Location & Date

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Location: Latitude: -33.828333, Longitude: 18.468889
General location information: Blouwberg Strand, South Coast
HAB Area code(s): ZAF-02
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1948-05-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: poisonings occurred throughout the month


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( cells/L)
uncertain identification, was ascribed to G. catenella
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: SAPEIKA, N. 1948 - Mussel poisoning. S. Afr. med. J. 22: 337-338.

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
Alexandrium catenella Saxitoxins Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Bioassay made on mice, rats and frogs
Economic losses:
Management decision:
Additional harmful effect information: Several human poisonings, one man died, several birds died
Created at 10:11 on 8 Nov 2019
Updated at 11:00 on 10 Nov 2019