General Information

Event name: CA-91-014
Country: CANADA
Nature of the harmful event:
Mass mortalities
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (This species occurs typically in Autumn in this region (including 1989, 1988 and 1987), but has usually disappeared by the beginning of November.)
Individuals to contact: FORBES, J. Roderick

Location & Date

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Location: Latitude: , Longitude:
General location information: Upper Strait of Georgia, Pacific Region
HAB Area code(s): CA-38
Additional location information: Eastern and northern Strait of Georgia, east side Queen Charlotte Strait, Simoom Sound. Occurred initially in northern Strait of Georgia area, and only later to the north and south.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Mid October- mid November.


Causative organism known: Yes
Causative Species/Genus: Chaetoceros convolutus (70,000 - 8 cells/L)
or C. concavicornis, in Teakerne Arm
Chaetoceros convolutus (18,000 - 3 cells/L)
or C. concavicornis, east Queen Charlotte Strait
Chaetoceros convolutus (200,000 cells/L)
or C. concavicornis, late October, Homfray Channel
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: east side of Queen Charlotte Strait (Simoom Sound, Sir Edmund Bay and Cypress Harbour)
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:
In situ
Growth Comments Most likely in situ growth at the various locations.
Additional Environmental information: No data.

Toxin Assay Information

Species containing the toxin Toxin type Toxin details Max. concentration Assay type
Kit used: Type of kit used:
Additional information:
Economic losses:
Management decision: None.
Additional harmful effect information:
Updated at 03:24 on 16 Feb 2018