General Information

Event name: ZAF-76-001
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: Yes
Individuals to contact: MANSFIELD, Lisa , SCHWEIBOLD Laura

Location & Date

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Location: Latitude: -34.243056, Longitude: 18.660556
General location information: False Bay, South Coast
HAB Area code(s): ZAF-02
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1976-09-01
Start: 1976-08-15, End: 1976-09-15
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Karenia sp. ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: BROWN, P. C., HUTCHINGS, L. and D. HORSTMAN 1979- A red-water outbreak and associated fish mortality at Gordon's Bay near Cape Town. Fish. Bull. S. Afr. 11: 46-52.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): 11.77 Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 15.6 °C, Min: 14.6 °C
Salinity Range During Event: Max: 34.99, Min: 34.71
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: Intraperitoneal injections of the phytoplankton extract cause acute morbidity, but not death in white mice
Economic losses:
Management decision:
Additional harmful effect information: mortality of a wide variety of fish in False Bay
Created at 02:43 on 7 Nov 2019
Updated at 10:23 on 25 Aug 2020