General Information

Event name: ZAF-62-002
Nature of the harmful event:
Water Discoloration , High Phyto concentration , Mass mortalities
Event directly affected:
Natural Fish
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location:
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -34.209167, Longitude: 18.649167
General location information: False Bay, South Coast
HAB Area code(s): ZAF-02
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1962-03-15, End: 1962-04-15
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: No
Causative Species/Genus: Gonyaulax polygramma Stein 1883 ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: GRINDLEY, J.R. and F.J.R. TAYLOR 1962 - Red water and mass-mortality of fish near Cape Town. Nature, Lond. 195: 1324.

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: Death of fish and invertebrates due to oxygen depletion in the water and decay of bloom.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information: Toxin assay prepared from 12 black mussels produced no neurotoxic symptoms or death in six white mice injected with the material.
Economic losses:
Management decision:
Additional harmful effect information: Mass- mortality of fish and marine invertebrates.
Created at 10:04 on 14 Jan 2019
Updated at 10:07 on 15 Jan 2019