General Information

Event name: CA-03-009
Country: CANADA
Nature of the harmful event:
Water Discoloration , High Phyto concentration , 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: Yes (This Heterosigma bloom was much earlier than is usually seen in this area.)
Individuals to contact: WHYTE, Ian

Location & Date

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Location: Latitude: 49.882778, Longitude: -126.815556
General location information: Upper west coast of Vancouver Is., Pacific Region
HAB Area code(s): CA-35
Additional location information: Bloom was seen in most major inlets on the west coast of Vancouver Island from the last week in July to the first week in August. Major effects seen in Clayoquot Sound July 21-24, Esaperanza Inlet July 28-31, Kyuquot Sound August 8th, and Quatsino Sound August 5-7. Mortalities reported from all but Quatsino Sound, but Esperanza worst hit.
Bloom event dates (yyyy/mm/dd): Event Date:2003-07-31
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Relatively short-lived bloom.


Causative organism known: Yes
Causative Species/Genus: Heterosigma akashiwo (30,000,000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Mortalities seen at Heterosigma concentrations ~1,000,000 cells/L.
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:
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:
Created at 04:10 on 22 Jul 2013
Updated at 03:03 on 16 Feb 2018