General Information

Event name: US-17-025
Nature of the harmful event:
Other ( potentially toxic species)
Event directly affected:
Toxicity detected: No
Associated syndrome:
Unexplained toxicity: No
Species implicated in toxin transmission (transvector):
Report the outcome of a monitoring programme: Yes (Maryland Phytoplankton Monitoring Program)
Event occurred before in this location: Yes (Alexandrium minutum 25,000 30,000 cells/ml, CB4.4 on 7/11/17. Chesapeake Bay vs coastal different species no indications of toxin to date)
Individuals to contact: WAZNIAK, Cathy

Location & Date

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Location: Latitude: 38.880000, Longitude: -76.251389
General location information: Chesapeake Bay, Eastern Bay (EE1.1),
HAB Area code(s): US-10
Additional location information: distributed throughout mid-Bay (Patuxent, Potomac, Eastern Bay, main bay). Highest observed count was in Eastern Bay- a prime oyster habitat. Current State bloom threshold is 500 cells/ml for A. minutum or 1,000 cells/ml for A. monilatum.
Bloom event dates (yyyy/mm/dd):
Quarantine levels dates (yyyy/mm/dd): First detection: 2017-07-11, End: 2017-08-14
Additional date-related information: Cell counts below bloom threshold no analysis


Causative organism known: Yes
Causative Species/Genus: Alexandrium minutum (98000 cells/L)
Co-Ocurring Species/Genus:
Chlorophyll concentration, if known: µg/l
Additional bloom information:
Event-related bibliography:

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 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 10:37 on 23 Apr 2018
Updated at 04:11 on 26 Jun 2020