General Information

Event name: ZAF-80-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Birds , Shellfish
Toxicity detected: Yes
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Choromytilus meridionalis and Donax serra
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (in 1967, 1968, 1974)
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -32.311667, Longitude: 18.331667
General location information: Elands Bay, West Coast
HAB Area code(s): ZAF-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1980-03-04
Start: 1980-03-04, End: 1980-05-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella (23 x 10e6 cells/L)
Reported as Gonyaulax catenella
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: HORSTMAN, D.A. 1981 Reported red-water outbreaks and their effects on fauna of the west and south coasts of South Africa, 1959-1980. Fish. Bull. S. Afr. 15: 71-88.

Environmental Conditions

Weather: Turbidity (NTU): Wind direction: SE
Stratified water: Oxygen content (nL/L): Wind velocity: 15-20 m/sec
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 Bioassay-Mouse
Kit used: Type of kit used:
Additional information:
Economic losses: Huge quantities of black and white mussels.
Management decision:
Additional harmful effect information: seabirds
Created at 11:58 on 28 Sep 2017
Updated at 09:12 on 23 Apr 2018