General Information

Event name: NA-04-001
Country: NAMIBIA
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Natural Fish , Birds
Toxicity detected: Yes (Approximate range: 118.7 - 182.2 ng/L)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location:
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -23.005000, Longitude: 13.827222
General location information: Namibia, Northern Benguela
HAB Area code(s): NAM-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2004-08-04
Start: 2004-08-04, End: 2004-08-10
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia australis (~62661.9 cells/L)
53% of the phytoplankton sample
Co-Ocurring Species/Genus: Pseudo-nitzschia pungens (~55568.1 cells/L)
47% of the phytoplankton sample
Chlorophyll concentration, if known: ~18mg/m3 µg/l
Additional bloom information:
Event-related bibliography: LOUW, D. C., DOUCETTE, G. J. and N. LUNDHOLM 2018 - Morphology and toxicity of Pseudo-nitzschia species in the northern Benguela upwelling system. Harmful Algae 75: 118-128.

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
Pseudo-nitzschia australis Domoic Acid 182.2ng/L LC-MS
Kit used: No Type of kit used:
Additional information: All samples extracts were analysed for the presence of DA by tandem mass spectrometry preceded by liquid chromatographic separation (LC-MS/MS).
Economic losses:
Management decision: To establish a baseline annual toxin monitoring programme and to investigate the toxicity trends related to abundance of Pseudo-nitzschia taxa.
Additional harmful effect information:
Created at 08:04 on 5 Jun 2020