General Information

Event name: ZAF-97-004
Nature of the harmful event:
High Phyto concentration , Seafood toxins , Freshwater
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes
Associated syndrome: Cyanobacterial toxins effects
Unexplained toxicity:
Species implicated in toxin transmission (transvector): Mytilus meridionalis
Report the outcome of a monitoring programme: No
Event occurred before in this location:
Individuals to contact: MANSFIELD, Lisa , SCHWEIBOLD Laura

Location & Date

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Location: Latitude: -34.133056, Longitude: 18.350000
General location information: Wildevoelvlei, South Coast
HAB Area code(s):
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1997-12-01
Quarantine levels dates (yyyy/mm/dd): First detection: 1997-12-01, End: 1998-05-30
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Microcystis aeruginosa ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Harding W. R., 1999. Saving a wetland and a marine mussel resource impacted by cyanobacterial hepatotoxins. Harmful Algae News 18: 11.

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
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision: Four-month ban on hasvesting, during which an artificial temporary enhancement of salinity has been done to get rid of the harmful algae
Additional harmful effect information:
Created at 01:03 on 6 Dec 2019
Updated at 03:27 on 6 Dec 2019