General Information

Event name: NA-65-001
Country: NAMIBIA
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:
Individuals to contact: MANSFIELD, Lisa

Location & Date

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Location: Latitude: -22.898056, Longitude: 14.485278
General location information: Namibia, Northern Benguela
HAB Area code(s): NAM-01
Additional location information: 29 stations were sampled within the Walvis Bay area.
Bloom event dates (yyyy/mm/dd): Event Date:1965-01-27
Start: 1965-01-15, End: 1965-02-05
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Dates are not clear on the exact start & end


Causative organism known: No
Causative Species/Genus: Peridinium triquetrum (Ehrenberg) Lebour 1925 (15437000 cells/L)
Co-Ocurring Species/Genus: Gymnodinium galatheanum Braarud 1957 (7327500 cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: PIETERSE, F. and D. C. VAN DER POST 1967 - The pilchard of South West Africa. Oceanographical conditions associated with red tides and fish mortalities in the Walvis Bay region. Investl Rep. mar. Res. Lab S.W. Afr. 14: 125pp.

Environmental Conditions

Weather: calm and hot Turbidity (NTU): Wind direction: N
Stratified water: Yes Oxygen content (nL/L): 2.4-7.3 Wind velocity:
Temperature (°C): 15.1-16.7 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 35.07 Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event: Max: 35.07, Min: 35.05
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
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision:
Additional harmful effect information:
Created at 12:50 on 12 Jun 2020
Updated at 01:40 on 12 Jun 2020