General Information

Event name: ZAF-67-001
Country: SOUTH AFRICA
Nature of the harmful event:
Water Discoloration
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: No
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -31.931389, Longitude: 18.161667
General location information: Elands Bay to Olifants River, West Coast
HAB Area code(s): ZAF-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 1967-12-28, End: 1968-01-28
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:

Microalgae

Causative organism known: Yes
Causative Species/Genus: Alexandrium catenella (40 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: S
Stratified water: Oxygen content (nL/L): Wind velocity: 15-20 m/sec
Temperature (°C): 20 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: 20 °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth:
Growth Comments
Additional Environmental information: 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.

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 and large quantities of west coast rock lobster
Management decision:
Additional harmful effect information: Also effected hag fish, sucker fish, octopuses and some sea birds.
Created at 10:34 on 28 Sep 2017
Updated at 01:14 on 23 Jan 2019
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