General Information

Event name: CA-99-002
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Low levels of DSP toxins (maximum concentration: 2.5 µg/g DTX1).)
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (P. lima has been found in the Laguna in the water column in the past (DFO monitoring program). This is the first identification of P. mexicanum in the Gulf of St. Lawrence.)
Individuals to contact: BONNEAU, Esther , LEVASSEUR, Maurice , SAUVÉ, Gilbert

Location & Date

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Location: Latitude: 47.466667, Longitude: -61.799722
General location information: Iles-de-la-Madeleine, Quebec Region
HAB Area code(s): CA-23
Additional location information: Magdalen Islands
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: July-August 1999.


Causative organism known: Yes
Causative Species/Genus: Prorocentrum mexicanum ( cells/L)
Prorocentrum lima ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Prorocentrum lima was found in the Laguna of Havre-aux-Maisons and Grande-Entrée in the water column, attached to the organisms growing on the mussels socks and in the gut of the mussels. Prorocentrum mexicanum was also identified for the first time in th
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: No Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: 22 °C, Min: 18 °C
Salinity Range During Event: Max: 31, Min: 27
Bloom location in the water column:
In situ
Growth Comments
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Scallop Okadaic Acid DTX1 2,5 µg/g Bioassay-Mouse
Kit used: Type of kit used:
Additional information: Low levels of DSP toxins (maximum concentration: 2.5 µg/g DTX1) were measrued in scallops, blue mussels and clams in 1999.
Economic losses:
Management decision: None
Additional harmful effect information:
Updated at 02:27 on 26 Sep 2013