| Event name: | ZAF-78-001 | |
| Country: | SOUTH AFRICA | |
|
Nature of the harmful event: |
Water Discoloration , High Phyto concentration , Mass mortalities | |
|
Event directly affected: |
Natural Fish | |
| 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: | No | |
| Individuals to contact: | MANSFIELD, Lisa | |
| Location: | Latitude: -32.759167, Longitude: 18.101667 | |
| General location information: |
St Helena Bay, West Coast HAB Area code(s): ZAF-01 |
|
| Additional location information: | Red water from Elands Bay to Dassen Island | |
| Bloom event dates (yyyy/mm/dd): |
Event Date:1978-04-01 Start: 1978-04-01, End: 1978-04-07 |
|
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | ||
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Mesodinium rubrum
( cells/L)
|
|
| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | 12.96 - 3.20 µg/l | |
| Additional bloom information: | Chlorophyll range recorded on 6th and 7th April. Data is misleading and probably sampled outside of bloom. | |
| 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:
9.0 - 1.0µg-at/L
PHOSPHATE: 18.2 - 2.8µg-at/L SILICATE: 53.2 - 24.6µg-at/L |
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| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: |
Surface |
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| Growth: | ||||||||||||||||||||||||||
| Growth Comments | ||||||||||||||||||||||||||
| Additional Environmental information: | Effect of a southerly wind on 7 April caused a slight recovery of oxygen content of water at station 1 and displace low-oxygen water father off shore. | |||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||
| Additional information: | |||||||
| Economic losses: | Damage to the west coast rock lobster, Jasus lalandii, industry as large numbers washed ashore. | ||||||
| Management decision: | |||||||
| Additional harmful effect information: | Hypoxia, causing many rock lobsters, natural fish and sharks as well as thousands of sea urchins to wash ashore. | ||||||
