General Information

Event name: CA-92-004
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes (Approximate range: Low detectable levels of DSP toxins.)
Associated syndrome: DSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (DSP in mussels was previously found at the same location in August 1990, June 1991, and August 1992.)
Individuals to contact: de FREITAS, Anthony

Location & Date

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Location: Latitude: , Longitude:
General location information: Halifax Eastern Shore, Scotia Fundy Region
HAB Area code(s): CA-17
Additional location information: Mahone Bay
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: August - September.


Causative organism known: No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Causative species not established.
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: 18 °C, Min: 12 °C
Salinity Range During Event:
Bloom location in the water column:
Growth Comments Not known.
Additional Environmental information:

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Mytilus edulis Okadaic Acid OA eq Low levels LC
Mytilus edulis Okadaic Acid DTX1 LC
Kit used: Type of kit used:
Additional information: Low detectable levels of DSP toxins were found in cultured mussels (Mytilus edulis). Toxin levels peaked during the last week in August, with the DTX-1 toxin as the main component. Levels of toxin became undetectable by late September. No toxin levels were detected in plankton samples.
Economic losses:
Management decision: An official closure of harvesting was implemented. This was the first closure in Canada due to DSP toxins
Additional harmful effect information:
Updated at 09:23 on 26 Sep 2018