General Information

Event name: CA-98-003
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: No
Individuals to contact: LEVASSEUR, Maurice , SAUVÉ, Gilbert

Location & Date

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Location: Latitude: , Longitude:
General location information: Iles-de-la-Madeleine, Québec 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: August 98.


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia delicatissima ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: During the same period, low levels for P. delicatissima were measured in the laguna of Havre-aux-Maisons.
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: °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
Kit used: Type of kit used:
Additional information: For the first time, traces of domoic acid have been measured in scallops (gonads) harvested in the vicinity of the Islands. Toxins concentrations were very low and presented no tread for human consumption. Nevertheless, this was the first report of the presence of domoic acid in shellfish collected in this part of the St. Lawrence.
Economic losses:
Management decision: The monitoring of domoic acid will continue next year. We are currently trying to isolate P. delicatissima in order to determine its toxicity.
Additional harmful effect information:
Updated at 05:27 on 17 Sep 2018