General Information

Event name: NA-11-001
Country: NAMIBIA
Nature of the harmful event:
Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: Yes (Approximate range: ~5.4 mg YTX equivalents/ kg shellfish tissue)
Associated syndrome:
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 & Date

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Location: Latitude: -22.933056, Longitude: 14.469167
General location information: Walvis Bay, Namibia
HAB Area code(s): NAM-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:2011-03-15
Start: 2011-03-15, End: 2011-03-18
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: No
Causative Species/Genus: Gonyaulax spinifera (674000 cells/L)
total cells/L was 1540000
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Marine phycotoxins in the northern Benguela region: biological and chemical parameters promoting the production of harmful algal blooms. Dissertation. Zur Erlangung des akademischen Grades doctor rerum naturalium (Dr. rer. Nat.) der Mathematisch-Naturwissenschaftlichen Fakultšt der Universitšt Rostock Vorgelegt von Chibo, Chikwililwa, geb. Am 13 June 1980 in Chingola, Zambia Aus Rostock

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
Gonyaulax spinifera Yessotoxins 45-OHYTX 5.4mg/kg shellfish LC-MS
Kit used: Type of kit used:
Additional information:
Economic losses: mussel samples at concentrations of up to 5.4 mg YTX equivalents kg-1 shellfish
Management decision:
Additional harmful effect information:
Created at 02:14 on 24 Aug 2020
Updated at 02:15 on 24 Aug 2020