| Event name: | ZAF-97-001 | |
| Country: | SOUTH AFRICA | |
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Nature of the harmful event: |
High Phyto concentration , Mass mortalities , Other ( massive rock lobster mass stranding due to low oxygen water) | |
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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: | Yes (similar to this event but not to this scale) | |
| Individuals to contact: | MANSFIELD, Lisa | |
| Location: | Latitude: -32.315278, Longitude: 18.331667 | |
| General location information: |
Elands Bay, West Coast HAB Area code(s): ZAF-01 |
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| Additional location information: | Dwarskersbos site of the last stranding on 7 May 1997 | |
| Bloom event dates (yyyy/mm/dd): |
Event Date:1997-04-05 Start: 1997-03-06, End: 1997-05-07 |
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| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | Bloom essentially persisted for two months. | |
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Ceratium furca
(1-25x10e6 cells/L)
total dinoflagellate concentration |
|
| Co-Ocurring Species/Genus: |
Ceratium lineatum
(1-25x10e6 cells/L)
total dinoflagellate concentration |
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| Chlorophyll concentration, if known: | >100mg/m3 µg/l | |
| Additional bloom information: | very high bottom chlorophyll a concentrations | |
| Event-related bibliography: | COCKCROFT, A.C., D.S. SCHOEMAN, G.C. PITCHER, G.W. BAILEY and D.L. VAN ZYL 1999 – A mass stranding, or "walk out" of west coast rock lobster, Jasus lalandii, in Elands Bay, South Africa: causes, results and implications. In: Crustacean issues. Vol 12. The biodiversity crisis and crustacea (Ed. by J.C Von Vaupel Klein and F.R. Schram), pp. 673-688 AA Balkema, Rotterdam, the Netherlands. | |
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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: |
Surface |
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| Growth: |
In situ |
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| Growth Comments | ||||||||||||||||||||||||||
| Additional Environmental information: | Very low oxygen levels in shallow inshore waters | |||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||
| Additional information: | |||||||
| Economic losses: | A total of 2000 tonnes of west coast rock lobster were stranded (in comparison to the annual TAC of 1680 tonnes for 1996/97 season) | ||||||
| Management decision: | In total, some 318 tonnes of rock lobster were returned to the sea alive in areas unaffected by low oxygen. Monitoring of red tide activity and a proposed early warning system to detect the presence of low oxygen water in Elands Bay. | ||||||
| Additional harmful effect information: | |||||||
