General Information

Event name: MDG-94-001
Nature of the harmful event:
Seafood toxins
Event directly affected:
Other Terrestrial , Humans
Toxicity detected: Yes
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): sardin Herklotsichtys quadrimaculatus
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes
Individuals to contact: QUOD, Jean-Pascal

Location & Date

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Location: Latitude: -14.906389, Longitude: 50.278889
General location information: Antalaha district,
HAB Area code(s): MAD-01
Additional location information:
Bloom event dates (yyyy/mm/dd): Event Date:1994-01-09
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Ostreopsis siamensis ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography: Onuma Y, Satake M, Ukena T, Roux J, Chanteau S, Rasolofonirina N, Ratsimaloto M, Naoki H, Yasumoto T, 1999. Identification of putative palytoxin as the cause of clupeotoxism. Toxicon 37: 55-65.

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
Ostreopsis siamensis Ostreocin (Palytoxin) Palytoxin 450ng Bioassay-Mouse
Kit used: No Type of kit used:
Additional information: Scientists hypothesized that the sardine toxin was not palytoxin itself but was an analog having a similar molecular weight.
Economic losses: unknown
Management decision: unknown
Additional harmful effect information:
Created at 12:00 on 2 Nov 2017
Updated at 09:58 on 6 Nov 2017