General Information

Event name: ZAF-99-002
Nature of the harmful event:
Seafood toxins , Mass mortalities
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: 1609 g STX eq 100g)
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes
Individuals to contact: MANSFIELD, Lisa , SCHWEIBOLD Laura

Location & Date

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Location: Latitude: -32.783333, Longitude: 17.883333
General location information: Paternoster, West coast
HAB Area code(s): ZAF-01
Additional location information: Abalones were tested from St Helena Bay to Cape Bay, with declined toxicity from St Helena to Cape.
Bloom event dates (yyyy/mm/dd): Event Date:1999-04-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Pitcher G. C. et al, 2001. Paralytic shellfish poisoning in the abalone Haliotis midae on the west coast of south Africa. Journal of Shellfish Research, vol.20 n.2: 895-904.

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 STX eq 1609 g STX eq 100g Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information: large number of detached or paralyzed abalone, some mortalities experienced, larvae malformations
Created at 02:42 on 6 Dec 2019