General Information

Event name: ZAF-95-001
Nature of the harmful event:
Seafood toxins , Other ( human skin and respiratory irritations)
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes
Associated syndrome: Aerosolized toxins effects
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (1988)
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -34.243056, Longitude: 18.660556
General location information: False Bay, South Coast, Western Cape
HAB Area code(s): ZAF-02
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1995-11-01
Start: 1995-11-01, End: 1996-02-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Gymnodinium mikimotoi Miyake et Kominami ex Oda 1935 ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: PITCHER, G.C. and S.G. MATTHEWS 1996 - Noxious Gymnodinium species in South African waters. In Harmful Algae News, ed, T. Wyatt, Intergovernmental Oceanographic Commission of UNESCO, 15: 1-3

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
Gymnodinium mikimotoi Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses: Larval mortalities experienced by land-based abalone farmers in Walker Bay.
Management decision: Warning issued against the collection of shellfish
Additional harmful effect information:
Created at 01:39 on 12 Nov 2018
Updated at 09:45 on 25 Aug 2020