General Information

Event name: ZAF-98-001
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
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 (Feb/ March 1997)
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -33.007500, Longitude: 18.004722
General location information: Saldanha Bay, West Coast
HAB Area code(s): ZAF-01
Additional location information: Line of 6 stations through bay-lagoon area from Langebaan to Small Bay in Saldanha Bay
Bloom event dates (yyyy/mm/dd): Event Date:1998-03-11
Start: 1998-02-01, End: 1998-03-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Sampling (6 stations) done on 11 March 1998.


Causative organism known: Yes
Causative Species/Genus: Aureococcus anophagefferens (1-3x10e9 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: 21.3-41.0 µg/l
Additional bloom information: Max concentrations of Aureococcus, with Chl a levels in excess of 40g/m3, were confined to the thermocline in the Bay (stas 6-9).
Event-related bibliography: PROBYN, T.A., BERNARD, S., PITCHER, G.C and R.N. PIENAAR 2010 Ecophysiological studies on Aureococcus anophagefferens blooms in Saldanha Bay, South Africa. Harmful Algae, 9: 123-133.

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: The presence of a brown tide bloom in the greater Saldanha Bay system during Feb/Mar 1998 indicates an ability to persist in deeper waters subject to higher flushing rates, of the order of a week.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 11:49 on 19 Jun 2018
Updated at 02:23 on 19 Jun 2018