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General Information

Event name: US-20-015
Country: UNITED STATES
Nature of the harmful event:
 Water Discoloration , High Phyto concentration
Event directly affected:
Toxicity detected: No
Associated syndrome: OTHER
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Virginia Harmful Algal Bloom Taskforce/ Chesapeake Bay Monitoring Program)
Event occurred before in this location: Yes (recurring fall blooms in lower York River and lower Chesapeake Bay/Hampton Roads since mid 1990s. Uncommon to spread to Virginia Beach oceanfront.)
Individuals to contact: EGERTON, Todd

Location & Date

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Location: Latitude: , Longitude:
General location information: Lower Chesapeake Bay, Virginia Beach Oceanfront, Virginia
HAB Area code(s): US-10
Additional location information:
Bloom event dates (yyyy/mm/dd): Start: 2020-08-05, End: 2020-09-01
Quarantine levels dates (yyyy/mm/dd):
Additional date-related information: Following Tropical Storm Isaias

Microalgae

Causative organism known: Yes
Causative Species/Genus: Margalefidinium polykrikoides (Margalef, 1961) F.Gómez, Richlen & D.M.Anderson, 2017 (11,500,000 cells/L)
Max ~8,600,000 cells/L observed at Norfolk Beaches (Chesapeake Bay). Max 2020= 11,500,000/L in Lafayette/Elizabeth River.
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information: Visible discolored and foul odor: picked up in 8/10/20 Virginian Pilot article: "That stinky smell at the Virginia Beach Oceanfront is an algae bloom"
Event-related bibliography: https://www.pilotonline.com/news/environment/vp-nw-algal-bloom-0811-20200810-o7xjsdmyjfayjefit77zu24fqi-story.html

Environmental Conditions

Weather: Turbidity (NTU): Wind direction:
Stratified water: Oxygen content (nL/L): Wind velocity:
Temperature (°C): Oxygen saturation %: Current Direction:
Sechhi disk (m): Salinity: Current Velocity:
Nutrient information:
Temperature Range During Event: Max: °C, Min: °C
Salinity Range During Event:
Bloom location in the water column:
Growth:
Growth Comments
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:
Additional harmful effect information:
Created at 12:12 on 20 Apr 2021
IOC/UNESCO ISSHA
IOC/UNESCO ICES PICES