General Information

Event name: CA-02-001
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: 1 - 21 ppm (g/g) DA.)
Associated syndrome: ASP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Canadian Shellfish Sanitation Program of the Canadian Food Inspection Agency)
Event occurred before in this location: No
Individuals to contact: BATES, Stephen S. , WHITE, John

Location & Date

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Location: Latitude: , Longitude:
General location information: Northumberland Shore, Gulf Region
HAB Area code(s): CA-13
Additional location information: Malagash. Approximately 200 km of coastline was affected.
Bloom event dates (yyyy/mm/dd): End: 2002-01-10
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom started December 22, 2001


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia multiseries ( cells/L)
No cell counts are available. The proportion of P. multiseries, as determined by SEM, ranged from 4 to 43% of the Pseudo-nitzschia species present.
Co-Ocurring Species/Genus: Pseudo-nitzschia pseudodelicatissima ( cells/L)
No cell counts are available. The proportion of P. pseudodelicatissima ranged from 8 to 87% of the Pseudo-nitzschia cells. P. pungens was present in low proportions (1 to 2%). P. pseudodelicatissima, P. fraudulenta and P. pungens are non-toxic in the Gulf
Pseudo-nitzschia fraudulenta ( cells/L)
Pseudo-nitzschia pungens ( cells/L)
Chlorophyll concentration, if known: µg/l
Additional bloom information: This is the first time that a closure due to domoic acid occurred along the northern coast of Nova Scotia. A closure due to domoic acid also occurred from December to January, but in 1987, and along the eastern shore of Prince Edward Island, southern Gul
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: Whole column
Growth: Advected
Growth Comments The bloom was likely advected into the bays from the southern Gulf of St. Lawrence.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus edulis Domoic Acid DA eq 21 g/g LC
Kit used: Type of kit used:
Additional information: HPLC-DAD.
Economic losses: Loss of sales due to harvesting closure; amount not known.
Management decision: Closure of affected harvesting area.
Additional harmful effect information: Domoic acid detected in blue mussels (Mytilus edulis); oysters (Crassostrea virginica) showed non-detectable for domoic acid.
Updated at 03:32 on 26 Sep 2013