General Information

Event name: CA-92-006
Country: CANADA
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: No
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 (Dinophysis is known to be a major component of the summer phytoplankton in the St. George Bay area from surbys carried out since the 1970's.)
Individuals to contact: SMITH, John C.

Location & Date

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Location: Latitude: , Longitude:
General location information: Northumberland Shore Nova Scotia, Gulf Region
HAB Area code(s): CA-13
Additional location information: St. George's Bay
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: June-July.


Causative organism known: Yes
Causative Species/Genus: Dinophysis acuminata ( cells/L)
Dinophysis norvegica ( cells/L)
Dinophysis acuta ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: A concentrated band of phytoplankton, containing about 95% Dinophysis species, was found close to the pycnocline at about 12 m depth. Dinophysis species found in order of abundance: D. acuta, D. norvegica, and D. acuminata.
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Yes Oxygen content (nL/L): Wind velocity:
Temperature (°C): 9 Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: 29 Current Velocity: 0
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth: Advected
Growth Comments Dinophysis cells were found both inside and outside of the bay. It is possible (but not known) that this population was advected from the Northumberland Strait to the west.
Additional Environmental information: There was some stratification,with a pycnoclime at about 12 - 16 m depth. A concentrated band of phytoplankton, containing about 95% Dinophysis species, was found close to the pycnocline at about 12 m depth.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information: ADAM / HPLC analysis.
Economic losses:
Management decision: None required.
Additional harmful effect information: Concentrated samples of net plankton, composed mainly of Dinophysis species, exhibited no DSP toxins using ADAM/HPLC analysis. Had unconfirmed reports of very low levels of DSP in shellfish (HPLC).
Updated at 07:51 on 25 Sep 2013