General Information

Event name: CA-04-008
Country: CANADA
Nature of the harmful event:
Mass mortalities
Event directly affected:
Aquaculture Fish
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Harmful Algae Monitoring Program)
Event occurred before in this location: No
Individuals to contact: HAIGH, Nicky

Location & Date

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Location: Latitude: 50.799167, Longitude: -127.500000
General location information: Upper Strait of Georgia, Pacific Region
HAB Area code(s): CA-38
Additional location information: Queen Charlotte Strait; Bloom only appeared to affect Duncan and Bell Island area
Bloom event dates (yyyy/mm/dd): Start: 2004-09-03, End: 2004-09-04
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Bloom occurred Oct 3-4.


Causative organism known: Yes
Causative Species/Genus: Chattonella sp. ( cells/L)
Unknown concentration
Co-Ocurring Species/Genus: Heterosigma akashiwo ( cells/L)
Unknown concentration
Chlorophyll concentration, if known: µg/l
Additional bloom information: Only 2 samples received from this bloom - a few cells of Chatonella sp. and Heterosigma akashiwo seen in samples from a day after mortalities occurred. The high number of mortalities that occurred extremely rapidly point to Chattonella being the causatative species
Event-related bibliography:

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: 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
Additional Environmental information:

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:
Additional harmful effect information: A high number of mortalities on two farm sites.
Updated at 02:57 on 16 Feb 2018