| Event name: | US-96-007 | |
| Country: | UNITED STATES | |
|
Nature of the harmful event: |
Seafood toxins , Mass mortalities | |
|
Event directly affected: |
Birds , Aquatic Mammals | |
| Toxicity detected: | Yes | |
| Associated syndrome: | OTHER | |
| 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: | DORTCH, Quay | |
| Location: | Latitude: , Longitude: | |
| General location information: |
, Louisiana. HAB Area code(s): US-17 |
|
| Additional location information: | Lousiana coastal waters from the Lousina/Mississippi border to 90º 40' W. | |
| Bloom event dates (yyyy/mm/dd): | Start: 1996-11-12, End: 1996-12-17 | |
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | But toxicity on-going (as of Mar. 13, 1997). | |
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Gymnodinium breve
(5,000 cells/L)
|
|
| Co-Ocurring Species/Genus: |
Dinophysis caudata
( cells/L)
Prorocentrum spp. ( cells/L) |
|
| Chlorophyll concentration, if known: | µg/l | |
| Additional bloom information: | Inshore waters east of Mississippi River: Exceeded 5,000 cells/L from Nov. 12, 1996 (start of sampling) to Dec. 4, 1996 with maximum abundance of 620,000 cells/L on 20/11/96. Inshore and shelf waters west of Mississippi River and east of 90º40'W. Ovserved | |
| Event-related bibliography: | ||
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| Nutrient information: | ||||||||||||||||||||||||||
| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
| Salinity Range During Event: | ||||||||||||||||||||||||||
| Bloom location in the water column: | ||||||||||||||||||||||||||
| Growth: | ||||||||||||||||||||||||||
| Growth Comments | There is no direct data at present to assess this question, but reported dates when Gymnodinium breve was present in Florida, Alabama, and Mississippi waters suggest advection from east was a factor. Growth must also have occurred to maintain such high nu | |||||||||||||||||||||||||
| Additional Environmental information: | Occurred in nearshore and shelf waters between 5 and 34.5 ppt and 14.5 and 21ºC. Abundances above regulatory limits (>5,000 cells/L) occurred in Lousiana waters betwee 18 and 28 ppt, but data from Mississippi suggests a lower salinity (15 ppt). | |||||||||||||||||||||||||
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| Kit used: No | Type of kit used: | |||||||||||
| Additional information: | ||||||||||||
| Economic losses: | ||||||||||||
| Management decision: | Shellfish harvest bans due to Gymnodinium breve from Nov. 13, 1996 to Feb. 28, 1997, Mississippi River Gulf Outlet to the Lousiana/Mississppi River border. Some areas opened Feb. 28, 1997 after 2 consecutive negative toxin tests (mouse bioassay); some are | |||||||||||
| Additional harmful effect information: | ||||||||||||
