General Information

Event name: CA-92-011
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
Event occurred before in this location: No
Individuals to contact: FORBES, J. Roderick

Location & Date

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Location: Latitude: , Longitude:
General location information: Upper West coast of Vancouver Island, Pacific Region
HAB Area code(s): CA-35
Additional location information: Kyuquot Sound and Nootka Sound.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Late August 92.


Causative organism known: Yes
Causative Species/Genus: Heterosigma akashiwo ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Heterosigma akashiwo intermixed with various other, presumed non-harmful species.
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 H. akashiwo believed to be in situ growth, although a major bloom of mixed phytoplankton species (including Noctiluca scientillans and Ceratium spp.) occurred concurrently in the inlets and in open water off the entrances to the affected inlets.
Additional Environmental information: Water temperatures unusually warm for the area, as the west coast was under the influence of a moderate El Niño event. Sea surface temperatures were 1 - 2º C warmer than usual on the exposed, outer coast, being in the range of 14 - 15º C through much of A

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: Value in excess of $ 1.5 million.
Management decision: Not applicable.
Additional harmful effect information:
Updated at 07:43 on 25 Sep 2013