| Event name: | ZAF-77-001 | |
| Country: | SOUTH AFRICA | |
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Nature of the harmful event: |
Water Discoloration , High Phyto concentration | |
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Event directly affected: |
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| Toxicity detected: | No | |
| Associated syndrome: | OTHER | |
| Unexplained toxicity: | ||
| Species implicated in toxin transmission (transvector): | ||
| Report the outcome of a monitoring programme: | No | |
| Event occurred before in this location: | No | |
| Individuals to contact: | MANSFIELD, Lisa | |
| Location: | Latitude: -32.759444, Longitude: 18.101667 | |
| General location information: |
St Helena Bay, West Coast HAB Area code(s): ZAF-01 |
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| Additional location information: | ||
| Bloom event dates (yyyy/mm/dd): |
Event Date:1977-11-22 Start: 1977-11-22, End: 1977-11-23 |
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| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | ||
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Mesodinium rubrum
(666670 cells/L)
recorded at station 2, 300 m off shore |
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| Co-Ocurring Species/Genus: |
Skeletonema costatum
(22749090 cells/L)
recorded at station 2, 300 m off shore |
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| Chlorophyll concentration, if known: | 3,47 - 123,40 µg/l | |
| Additional bloom information: | Mesodinium rubrum comprised only 5% of the total phytoplankton population at station 1, but was sufficient to dicolour the water a deep maroon. | |
| 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. | |
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| Nutrient information: |
NITRATE:
0,4 - 14,9µg-at/L
PHOSPHATE: 0,8 - 3,4µg-at/L SILICATE: 2,8 - 38,9µg-at/L |
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| Temperature Range During Event: | Max: 15 °C, Min: 14 °C | |||||||||||||||||||||||||
| Salinity Range During Event: | Max: 34,69, Min: 34,67 | |||||||||||||||||||||||||
| Bloom location in the water column: |
Surface |
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| Growth: | ||||||||||||||||||||||||||
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| Additional Environmental information: | Strong, shallow thermocline at 5-8 m. | |||||||||||||||||||||||||
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