| Event name: | CA-90-005 | |
| Country: | CANADA | |
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Nature of the harmful event: |
Seafood toxins | |
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Event directly affected: |
Shellfish | |
| Toxicity detected: | Yes (Approximate range: 2,218 - 5,468 µg STXeq / 100 g) | |
| Associated syndrome: | PSP | |
| Unexplained toxicity: | No | |
| Species implicated in toxin transmission (transvector): | ||
| Report the outcome of a monitoring programme: | Yes | |
| Event occurred before in this location: | Yes (Toxic blooms reported annually since 1984; PSP toxic incidents known for more than 100 years in the region.) | |
| Individuals to contact: | HUPPERTZ, Béatrice | |
| Location: | Latitude: , Longitude: | |
| General location information: |
South coast St. Lawrence Estuary, Quebec Region HAB Area code(s): CA-07 |
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| Additional location information: | Mid-northern shore (49º14'N, 68º09'W) and lower southern shore (48º49'N, 68º10'W) of the St. Lawrence estuary and the southwestern Gulf of St. Lawrence (48º39'N, 64º26'W) | |
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | Late June - early July | |
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Alexandrium excavatum
(450,000 cells/L)
|
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| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | µg/l | |
| Additional bloom information: | ||
| Event-related bibliography: | ||
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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: 17 °C, Min: 9 °C | |||||||||||||||||||||||||
| Salinity Range During Event: | Max: 31, Min: 21 | |||||||||||||||||||||||||
| Bloom location in the water column: | ||||||||||||||||||||||||||
| Growth: |
Advected
In situ |
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| Growth Comments | Based upon circumstantial evidence from known water circulation patterns and benthic cyst distributions, it is likely that the Alexandrium spp. blooms found along the nothern shore of the st. Lawrence estuary represent endemic populations. The blooms alon | |||||||||||||||||||||||||
| Additional Environmental information: | Temperature range: 2 - 21º C (9 - 17º C during the bloom) Salinity range: 15 - 31‰ ( 21 - 31‰ during the bloom) | |||||||||||||||||||||||||
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| Kit used: | Type of kit used: | |||||||||||
| Additional information: | ||||||||||||
| Economic losses: | ||||||||||||
| Management decision: | Periodic closures of recreational and commercial shellfish harvesting zones. | |||||||||||
| Additional harmful effect information: | No human illness reported. PSP toxicity detected in soft-shell clams (Mya arenaria) and blue mussels (Mytilus edulis). | |||||||||||
