| Event name: | US-93-004 | |
| Country: | UNITED STATES | |
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Nature of the harmful event: |
Seafood toxins | |
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Event directly affected: |
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| Toxicity detected: | Yes | |
| 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 (High levels of paralytic shellfish toxins were firt observed in Georges Bank shellfish in 1989. Toxin levels increased in 1990. Despite the apparent absence of Alexandrium blooms in the Georges Bank region since 1990, the persistence of the toxins in surf clams has resulted in a continuing closure of the Georges Bank surf clam fishery.) | |
| Individuals to contact: | WHITE, Alan | |
| Location: | Latitude: , Longitude: | |
| General location information: |
Georges Bank., Massachusetts. HAB Area code(s): US-06 |
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| Additional location information: | Offshore, Area 6. | |
| Bloom event dates (yyyy/mm/dd): | ||
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | ||
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Alexandrium fundyense
( cells/L)
Alexandrium tamarense ( cells/L) |
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| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | µg/l | |
| Additional bloom information: | Alexandrium fundyense and/or A. tamarense (variety not yet determined) | |
| Event-related bibliography: | ||
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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: 12 °C, Min: 10 °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: | ||||||||||||||||||||||||||
| Growth: | ||||||||||||||||||||||||||
| Growth Comments | The origin of the offshore toxicity and its relationship with inshore toxicity remain unknown. | |||||||||||||||||||||||||
| Additional Environmental information: | Georges Bank is an open ocean environment, 100-200 miles from the nearest land (cape Cod). Much of the Georges Bank area is very shallow (10-15 m). The region is a rich fishing grounds for shellfish and finfish. Stratification of the waters ovelying Geor | |||||||||||||||||||||||||
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| Kit used: No | Type of kit used: | ||||||
| Additional information: | |||||||
| Economic losses: | |||||||
| Management decision: | The closure of Georges Bank to the harvesting of molluscan shellfish with the exception of sea scallop adductor muscles was contineud throughout 1993 because of the risk of paralytic shellfish poisoning. | ||||||
| Additional harmful effect information: | |||||||
