| Event name: | US-19-021 | |
| Country: | UNITED STATES | |
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Nature of the harmful event: |
High Phyto concentration , Mass mortalities | |
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Event directly affected: |
Natural Fish | |
| Toxicity detected: | No | |
| Associated syndrome: | OTHER | |
| Unexplained toxicity: | No | |
| Species implicated in toxin transmission (transvector): | ||
| Report the outcome of a monitoring programme: | Yes (Environmental monitoring programs of Maryland Department of Natural Resources, Virginia Department of Health, and Maryland Department of Environment) | |
| Event occurred before in this location: | No | |
| Individuals to contact: | WOLNY, Jennifer , EGERTON, Todd | |
| Location: | Latitude: , Longitude: | |
| General location information: |
Potomac River, HAB Area code(s): US-10 |
|
| Additional location information: | 38.3625N -76.9906W to 38.1439N -76.5397W The bloom stretched from Colonial Beach, VA to Ragged Point Beach, VA with the mortality epicenter occurring in the region of Westmoreland, VA. | |
| Bloom event dates (yyyy/mm/dd): | Start: 2019-07-24, End: 2019-08-14 | |
| Quarantine levels dates (yyyy/mm/dd): | ||
| Additional date-related information: | ||
| Causative organism known: | Yes | |
| Causative Species/Genus: |
Gymnodinium spp.
(2156000 cells/L)
Levanderina fissa (formerly Gymnodinium instriatum) |
|
| Co-Ocurring Species/Genus: | ||
| Chlorophyll concentration, if known: | 196 ug/L max µg/l | |
| Additional bloom information: | dark waters are domianted by L. fissa, bright green-grey waters are dominated by bacteria and ciliates and were hypoxic or anoxic. | |
| Event-related bibliography: | ||
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| Temperature Range During Event: | Max: °C, Min: °C | |||||||||||||||||||||||||
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| Bloom location in the water column: | ||||||||||||||||||||||||||
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| Kit used: | Type of kit used: | ||||||
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| Management decision: | VDH issued a general safe swimming recommendation to the public advising the public to avoid contact and recreational activities in the vicinity of discolored water and dead fish. | ||||||
| Additional harmful effect information: | Reports of 100s of dead fish and crab were received by MD DNR the 3rd week of July. Phytoplankton samples were collected the 4th week of July confirming the presence of a L. fissa bloom, stratified water, and hypoxia in lower portions of the water column. | ||||||
