General Information

Event name: CA-97-004
Country: CANADA
Nature of the harmful event:
Seafood toxins
Event directly affected:
Toxicity detected: Yes
Associated syndrome: PSP
Unexplained toxicity: No
Species implicated in toxin transmission (transvector): Clams.
Report the outcome of a monitoring programme: Yes
Event occurred before in this location: Yes (PSP toxicity has been measured by the mouse bioassay technique on a regular basis since 1961 in the St. Lawrence. Algae are monitored at the coastal stations only since 1989.)
Individuals to contact: BONNEAU, Esther , LEVASSEUR, Maurice , SAUVÉ, Gilbert

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: North coast Anticosti Gyre, Quebec Region
HAB Area code(s): CA-04
Additional location information: Sept-Iles Station. Harmful algae are monitored on a weekly basis at 11 stations in the Gulf of St. Lawrence since 1989 (See Figure 1 in the Complementary Information Form).
Bloom event dates (yyyy/mm/dd): Event Date:1997-07-19
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Alexandrium tamarense (8,480 cells/L)
Highest concentration, 19/07/97.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
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
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: PSP measured by mouse bioassay.
Economic losses:
Management decision: Shellfish areas with paralytic shellfish toxins concentration exceeding 80 µg STX equi./100 g (as determined by the mouse bioassay technique) were closed to harvesting during variable periods of time during summer months of 1996 and 1997.
Additional harmful effect information: Paralytic shellfish toxins concentration have exceeded 80 µg STX equi./100 g (as determined by the mouse bioassay technique) at several stations in 1997. Two persons became ill after eating toxic clams near Havre-St-Pierre, an area usually toxin-free.
Updated at 01:59 on 26 Sep 2013