General Information

Event name: ZAF-92-001
Nature of the harmful event:
Water Discoloration , Seafood toxins
Event directly affected:
Shellfish , Humans
Toxicity detected: Yes (Approximate range: <0.1 - >5.1g OA per g hepatopancreas)
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): mussels
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (The previous year, 1991)
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -32.543889, Longitude: 18.178056
General location information: St Helena Bay, West Coast
HAB Area code(s): ZAF-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1992-02-24
Start: 1992-02-01, End: 1992-04-30
Quarantine levels dates (yyyy/mm/dd): First detection: 1992-02-24,
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata (250000 cells/L)
Co-Ocurring Species/Genus: Ceratium furca (>250000 cells/L)
much higher concentrations than D. acuminata
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: PITCHER, G.C., D.A. HORSTMAN, D. CALDER, J.H. DE BRUYN and B.J. POST 1993 The first record of diarrhetic shellfish poisoning on the South African coast. S. Afr. J Sci. 89: 512 -514

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:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Dinophysis acuminata Okadaic Acid >5.1g OA/g hepatopa ELISA
Kit used: Yes Type of kit used: Quick Test Kit
Additional information: continued toxicity at several sights into the winter months
Economic losses:
Management decision: Public were advised against eating mussels in these areas
Additional harmful effect information:
Created at 02:19 on 27 Sep 2017
Updated at 09:16 on 23 Apr 2018