General Information

Event name: CA-02-016
Country: CANADA
Nature of the harmful event:
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: No
Event occurred before in this location: Yes (High levels of DA were measured in 1999 in scallops from the les-de-la-Madeleine.This is the first DA outbreak in the baie des Chaleurs in April. Blooms of Pseudo-nitzschia seriata usually occur in September and October.)
Individuals to contact: BONNEAU, Esther , SAUV, Gilbert

Location & Date

[View larger map]
Location: Latitude: , Longitude:
General location information: Gaspe, Quebec Region
HAB Area code(s): CA-09
Additional location information: Gascons, Carleton
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: For the first year, high levels of domoic acid (maximum of 89 g DA/g) were measured in the digestive gland of shellfish collected from Carleton and Gascons (baie des Chaleurs) on April 13, 2002. For the first time on the south shore of the St. Lawrence estuary DA concentrations (1.5 to1.9 g DA/g) were measured in Mya arenaria near Mont-Louis (Fig. 1) from September 21 to 5 october. For the third year, DA was measured (0.8 to 25.8 g DA/g) in Mya arenaria from Penouille (Fig.1), but it is the first time that the values are higher than 20g DA/g for this location. For the second year in the northeastern part of the Gulf, low levels of DA (1.7 to 5.7gDA/g) were measured in scallops near Tte--la-Baleine (Fig.1).


Causative organism known: Yes
Causative Species/Genus: Pseudo-nitzschia delicatissima ( cells/L)
Pseudo-nitzschia seriata ( cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: The DA outbreak in the Lower Estuary coincided with blooms of Pseudo-nitzschia seriata and P. delicatissima.
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 In situ growth. Pseudo-nitzschia spp. are common members of the phytoplankton assemblage in the St. Lawrence, where blooms occur at the end of the summer from August to October.
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: Closure of sectors.
Additional harmful effect information: ASP toxins detected inASP toxins detected in shellfish and closure of aquaculture farms shellfish and closure of aquaculture farms
Updated at 03:03 on 26 Sep 2013