General Information

Event name: CA-96-007
Country: CANADA
Nature of the harmful event:
High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome:
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: LEVASSEUR, Maurice , SAUVÉ, Gilbert

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: North coast St. Lawrence Estuary, Quebec Region
HAB Area code(s): CA-05
Additional location information: Baie-Comeau 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:1996-09-14
Start: 1996-09-14,
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information:


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia delicatissima (917,833 cells/L)
Highest concentration.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

Environmental Conditions

Weather: 1996 was atypical. Between 19 and 21 July, more than 225 mm of rain fell over the Saguenay river area in the Province of Quebec. This unusual weather resulted in the flooding of several towns along the Saguenay River. In the St. Lawrence stuary, the heavy 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:
Economic losses:
Management decision:
Additional harmful effect information: In 1996 three persons became seriuosly ill and were hospitalized after eating toxic clams during the red-tide event.
Updated at 08:36 on 25 Sep 2013