General Information

Event name: ZAF-00-001
Nature of the harmful event:
Mass mortalities
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 4x higher than level acceptable for human consumption)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): mussels
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (1967)
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -33.828333, Longitude: 18.474167
General location information: Bloubergstrand, West Coast, South Africa
HAB Area code(s): ZAF-01
Additional location information: Mussels from Scarborough on Cape Peninsula also toxic.
Bloom event dates (yyyy/mm/dd): Event Date:2000-05-31
Quarantine levels dates (yyyy/mm/dd): First detection: 2000-05-31,
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( cells/L)
cell/L not given in this record
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: PITCHER, G.C. 2000 Mortality of Otter Shells at Bloubergstrand. African Wildlife 54 (5) 26-27.

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: Ban placed by Marine and Coastal Management on the collection of shellfish at the time of the event
Additional harmful effect information: Mass mortality of approximately 100 tons of otter shells, Lutraria lutraria on Bloubergstrand.
Created at 10:01 on 15 Jan 2019
Updated at 10:04 on 15 Jan 2019