General Information

Event name: CA-91-004
Country: CANADA
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: No
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: Yes (Dinophysis norvegica and DTX-1 in mussels were previously found at the same location in early August, 1990)
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, Southern coast of Nova Scotia.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Late September - November.


Causative organism known: Yes
Causative Species/Genus: Dinophysis norvegica (10,000 - 4 cells/L)
during the bloom period.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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 Not known.
Additional Environmental information: Water temperature: 15 - 19C in September, declining to 10 - 12 C in October. There was no strong thermocline.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information: A concentrated sample of plankton, composed almost uniquely of Dinophysis norvegica, exhibited no detectable DSP toxins using ADAM/HPLC analysis.
Economic losses:
Management decision: None required.
Additional harmful effect information:
Updated at 07:20 on 25 Sep 2013