Harmful Algal Information System: Event CA-92-010

General Information

Event name:	CA-92-010
Country:	CANADA
Nature of the harmful event:	Seafood toxins
Event directly affected:
Toxicity detected:	Yes
Associated syndrome:	ASP
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:	UpperWest coast of Vancouver Island, Pacific Region HAB Area code(s): CA-35
Additional location information:	Quatsino Sound, Clayoquot Sound and Barkley Sound.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:	Prior to 23 August 1992 and presumed continuing through to October or November.

Microalgae

Causative organism known:	No
Causative Species/Genus:
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known:	µg/l
Additional bloom information:	Unknown.
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:

Growth:

Growth Comments

Unknown. Occurrence in several disjunct large inlets, two with restricted oceanic exchange, suggests in situ growth.

Additional Environmental information:

Water temperatures unusually warm for the area, as the west coast was under the influence of a moderate El Ni�o event. Sea surface temperatures were 1 - 2� C warmer than usual on the exposed, outer coast, being in the range of 14 - 15� C through much of A

Toxin Assay Information

Species containing the toxin	Toxin type	Toxin details	Max. concentration	Assay type
Whole mussel extracts	Domoic Acid	DA eq	96 ppm	LC
Crab hepatopancreas	Domoic Acid	DA eq	276 ppm	LC

Kit used:

Type of kit used:

Additional information:

Economic losses:

Management decision:

Harvesting closed to affected species in areas where concentrations exceeded 20 ppm.

Additional harmful effect information:

Updated at 07:45 on 25 Sep 2013